FIELD
[0001] The present disclosure relates to a field of household appliances technology, and
more particularly, to a control method of a heat pump water heater unit, a control
device of a heat pump water heater unit and a heat pump water heater unit having the
same.
BACKGROUND
[0002] As to on-peak and off-peak time-of-use of electricity, although electricity in off-peak
hours is very cheap, total time of the off-peak hours is limited. In order to use
the heat pump water heater unit as much as possible within a limited time period,
and to ensure that a water temperature of the heat pump water heater unit reaches
a set temperature, an electric auxiliary heater is required to be turned on at an
appropriate time.
[0003] In the related art, the opening of the electric auxiliary heater is controlled according
to a set water temperature. In other words, when the water temperature of the heat
pump water heater unit reaches the set water temperature, the electric auxiliary heater
is controlled to be turned on, and when the water temperature of the heat pump water
heater unit reaches the set temperature, the electric auxiliary heater is controlled
to be turned off.
[0004] However, since the heating capacity of the heat pump host may change after operating
for a period of time, and the environment temperature may change during the operation,
a simple calculation may cause a large deviation, thereby causing the electric auxiliary
heater to be turned on in advance, which may increase energy consumption, or causing
delayed opening of the electric auxiliary heater, so that the water temperature of
the heat pump water heater unit cannot reach the set temperature.
SUMMARY
[0005] The present disclosure aims to solve at least one of the problems existing in the
related art to at least some extent.
[0006] Accordingly, an objective of the present disclosure is to provide a control method
of a heat pump water heater unit, in which turning on of an electric auxiliary heater
is controlled according to a time period that is calculated in real time and is required
for a temperature of a water tank to rise by a pre-set temperature when both the heat
pump water heater unit and the electric auxiliary heater are turned on, thus not only
a purpose of saving energy can be achieved, but also the requirement of a user for
the water temperature can be satisfied.
[0007] Another objective of the present disclosure is to provide a control device of a heat
pump water heater unit.
[0008] Another objective of the present disclosure is to provide a heat pump water heater
unit.
[0009] To achieve the above objectives, embodiments of an aspect of the present disclosure
provide a control method of a heat pump water heater unit. The heat pump water heater
unit includes a heat pump host, an electric auxiliary heater and a water tank. The
control method includes: after receiving an off-peak electricity signal, obtaining
a water temperature of the water tank and determining whether the water temperature
of the water tank is less than a set temperature; when the water temperature is less
than the set temperature, controlling the heat pump host to be in a turned-on state;
calculating a time period required for the water temperature of the water tank to
rise by a first pre-set temperature when both the heat pump host and the electric
auxiliary heater are turned on every first pre-set time period, and recording the
time period as a first time period; determining whether the first time period is less
than a second pre-set time period; and when the first time period is less than the
second pre-set time period, controlling the electric auxiliary heater to be in the
turned-on state.
[0010] With the control method of a heat pump water heater unit according to embodiments
of the present disclosure, the water temperature of the water tank is obtained after
receiving the off-peak electricity signal. When the water temperature of the water
tank is less than the set temperature, the heat pump host is controlled to be in the
turned-on state. The time period required for the water temperature of the water tank
to rise by the first pre-set temperature when both the heat pump host and the electric
auxiliary heater are turned on is calculated every first pre-set time period, and
the time period is recorded as the first time period. When the first time period is
less than the second pre-set time period, the electric auxiliary heater is controlled
to be in the turned-on state. With the method, the opening of the electric auxiliary
heater is controlled according to the time period calculated in real time and required
for the water temperature of the tank to raise by the set temperature when both the
heat pump host and the electric auxiliary heater are turned on, thus not only a purpose
of saving energy can be achieved, but also requirement of a user for the water temperature
can be satisfied.
[0011] According to an embodiment of the present disclosure, calculating period required
for the water temperature of the water tank to rise by the first pre-set temperature
when both the heat pump host and the electric auxiliary heater are turned on every
first pre-set time period includes: determining whether the set temperature is less
than a maximum heating temperature of the heat pump host at a current outdoor ambient
temperature; when the set temperature is less than the maximum heating temperature
of the heat pump host at the current outdoor ambient temperature, calculating a remaining
total time period of the off-peak electricity according to the first pre-set time
period, and calculating the first time period according to the remaining total time
period of the off-peak electricity, the set temperature, and the water temperature
of the water tank; when the set temperature is greater than or equal to the maximum
heating temperature of the heat pump host at the current outdoor ambient temperature,
calculating the remaining total time period of the off-peak electricity according
to the first pre-set time period and a time period required for the water temperature
of the water tank to rise by the first pre-set temperature when the electric auxiliary
heater is turned on alone, and calculating the first time period according to the
remaining total time period of the off-peak electricity, the maximum heating temperature
of the heat pump host at the current outdoor ambient temperature, and the water temperature
of the water tank.
[0012] According to an embodiment of the present disclosure, when the set temperature is
less than the maximum heating temperature of the heat pump host at the current outdoor
ambient temperature, the first time period is calculated according to a following
formula:
where t is the first time period, H is a total time period of the off-peak electricity,
TM is the first pre-set time period, n is a number of calculation times, TS is the
set temperature, and T5 is the water temperature of the water tank.
[0013] According to another embodiment of the present disclosure, when the set temperature
is greater than or equal to the maximum heating temperature of the heat pump host
at the current outdoor ambient temperature, the first time period is calculated according
to a following formula:
where t is the first time period, H is a total time period of the off-peak electricity,
and
tde is the time period required for the water temperature of the water tank to rise by
the first pre-set temperature when the electric auxiliary heater is turned on alone,
and the TS is the set temperature, Tstop is the maximum heating temperature of the
heat pump host at the current outdoor ambient temperature, n is a number of calculation
times, TM is the first pre-set time period, and T5 is the water temperature of the
water tank.
[0014] According to an embodiment of the present disclosure, the second pre-set time period
is a minimum time period required for the water temperature of the water tank to rise
by the first pre-set temperature when both the heat pump host and the electric auxiliary
heater are turned on at the current outdoor ambient temperature.
[0015] According to an embodiment of the present disclosure, after controlling a the electric
auxiliary heater to be in the turned-on state, the control method further includes:
when the set temperature is less than the maximum heating temperature of the heat
pump host at the current outdoor ambient temperature, controlling both the heat pump
host and the electric auxiliary heater to be in a turned-off state when the water
temperature of the water tank is greater than or equal to the set temperature; when
the set temperature is greater than or equal to the maximum heating temperature of
the heat pump host at the current outdoor ambient temperature, controlling the heat
pump host to be in the turned-off state when the water temperature of the water tank
is greater than or equal to the maximum heating temperature of the heat pump host
at the current outdoor ambient temperature, and controlling the electric auxiliary
heater to be in the turned-off state when the water temperature of the water tank
is greater than or equal to the set temperature.
[0016] To achieve the above objectives, embodiments of another aspect of the present disclosure
provide a control device of a heat pump water heater unit. The heat pump water heater
unit includes a heat pump host, an electric auxiliary heater and a water tank. The
control device includes: a temperature acquisition module, configured to acquire a
water temperature of the water tank; a control module, in which the control module
is respectively coupled to the temperature acquisition module, the heat pump host
and the electric auxiliary heater. The control module is configured to determine whether
the water temperature of the water tank is less than a set temperature after receiving
an off-peak electricity signal. When the water temperature of the water tank is less
than the set temperature, the control module is configured to control the heat pump
host to be in a turned-on state, to calculate a time period required for the water
temperature of the water tank to rise by a first pre-set temperature when both the
heat pump host and the electric auxiliary heater are turned on every first pre-set
time period, to record the time period as the first time period, to determine whether
the first time period is less than a second pre-set time period, and to control the
electric auxiliary heater to be in the turned-on state when the first time period
is less than the second pre-set time period.
[0017] With the control device of a heat pump water heater unit according to embodiments
of the present disclosure, the control module determines whether the water temperature
of the water tank is less than the set temperature after receiving the off-peak electricity
signal. When the water temperature of the water tank is less than the set temperature,
the control module controls the heat pump host to be in the turned-on state, calculates
the time period required for the water temperature of the water tank to rise by the
first pre-set temperature when both the heat pump host and the electric auxiliary
heater are turned on every first pre-set time period, and records the time period
as the first time period. When the first time period is less than the second pre-set
time period, the control module controls the electric auxiliary heater to be in the
turned-on state. The device controls the opening of the electric auxiliary heater
according to the time period calculated in real time and required for the water temperature
of the tank to raise by the set temperature when both the heat pump host and the electric
auxiliary heater are turned on, thus not only a purpose of saving energy can be achieved,
but also requirement of a user for the water temperature can be satisfied.
[0018] According to an embodiment of the present disclosure, when the control module calculates
the time period required for the water temperature of the water tank to rise by the
first pre-set temperature when both the heat pump host and the electric auxiliary
heater are turned on every first pre-set time period, the control module is configured
to determine whether the set temperature is less than a maximum heating temperature
of the heat pump host at a current outdoor ambient temperature; when the set temperature
is less than the maximum heating temperature of the heat pump host at the current
outdoor ambient temperature, the control module is configured to calculate a remaining
total time period of the off-peak electricity according to the first pre-set time
period, and to calculate the first time period according to the remaining total time
period of the off-peak electricity, the set temperature, and the water temperature
of the water tank; when the set temperature is greater than or equal to the maximum
heating temperature of the heat pump host at the current outdoor ambient temperature,
the control module is configured to calculate the remaining total time period of the
off-peak electricity according to the first pre-set time period and a time period
required for the water temperature of the water tank to rise by the first pre-set
temperature when the electric auxiliary heater is turned on alone, and to calculate
the first time period according to the remaining total time period of the off-peak
electricity, the maximum heating temperature of the heat pump host at the current
outdoor ambient temperature, and the water temperature of the water tank.
[0019] According to an embodiment of the present disclosure, when the set temperature is
less than the maximum heating temperature of the heat pump host at the current outdoor
ambient temperature, the control module is configured to calculate the first time
period according to a following formula:
where t is the first time period, H is a total time period of the off-peak electricity,
TM is the first pre-set time period, n is a number of calculation times, TS is the
set temperature, and T5 is the water temperature of the water tank.
[0020] According to another embodiment of the present disclosure, when the set temperature
is greater than or equal to the maximum heating temperature of the heat pump host
at the current outdoor ambient temperature, the control module is configured to calculate
the first time period according to a following formula:
where t is the first time period, H is a total time period of the off-peak electricity,
and
tde is the time period required for the water temperature of the water tank to rise by
the first pre-set temperature when the electric auxiliary heater is turned on alone,
the TS is the set temperature, Tstop is the maximum heating temperature of the heat
pump host at the current outdoor ambient temperature, n is a number of calculation
times, TM is the first pre-set time period, and T5 is the water temperature of the
water tank.
[0021] According to an embodiment of the present disclosure, the second pre-set time period
is a minimum time period required for the water temperature of the water tank to rise
by the first pre-set temperature when both the heat pump host and the electric auxiliary
heater are turned on at the current outdoor ambient temperature.
[0022] According to an embodiment of the present disclosure, after controlling the electric
auxiliary heater to be in the turned-on state, when the set temperature is less than
the maximum heating temperature of the heat pump host at the current outdoor ambient
temperature, the control module is configured to control both the heat pump host and
the electric auxiliary heater to be in a turned-off state when the water temperature
of the water tank is greater than or equal to the set temperature; when the set temperature
is greater than or equal to the maximum heating temperature of the heat pump host
at the current outdoor ambient temperature, the control module is configured to control
the heat pump host to be in the turned-off state when the water temperature of the
water tank is greater than or equal to the maximum heating temperature of the heat
pump host at the current outdoor ambient temperature, and to control the electric
auxiliary heater to be in the turned-off state when the water temperature of the water
tank is greater than or equal to the set temperature.
[0023] In addition, embodiments of the present disclosure also provide a heat pump water
heater unit including the above-described control device of the heat pump water heater
unit.
[0024] The heat pump water heater unit according to embodiments of the present disclosure
controls the opening of the electric auxiliary heater through the above control device
according to the time period calculated in real time and required for the water temperature
of the tank to raise by the set temperature when both the heat pump host and the electric
auxiliary heater are turned on, thus not only a purpose of saving energy can be achieved,
but also requirement of a user for the water temperature can be satisfied.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025]
Fig. 1 is a flow chart of a control method of a heat pump water heater unit according
to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram illustrating a relationship between an outdoor ambient
temperature and a maximum heating temperature of the heat pump host according to an
embodiment of the present disclosure.
Fig. 3 is a schematic diagram illustrating the logic of a control method of a heat
pump water heater unit according to an embodiment of the present disclosure.
Fig. 4 is a diagram illustrating the logic of a control method of a heat pump water
heater unit according to another embodiment of the present disclosure.
Fig. 5 is a schematic diagram illustrating a relationship between an outdoor ambient
temperature and a second pre-set time period according to an embodiment of the present
disclosure.
Fig. 6 is a flow chart of a control method of a heat pump water heater unit according
to an embodiment of the present disclosure.
Fig. 7 is a schematic diagram illustrating the structure of a heat pump water heater
unit according to an embodiment of the present disclosure.
DETAILED DESCRIPTION
[0026] Reference will be made in detail to embodiments of the present disclosure. Examples
of the embodiments of the present disclosure will be shown in drawings, in which the
same or similar elements and the elements having same or similar functions are denoted
by like reference numerals throughout the descriptions. The embodiments described
herein according to drawings are explanatory and illustrative, not construed to limit
the present disclosure.
[0027] A control method of a heat pump water heater unit, a control device of a heat pump
water heater unit, and a heat pump water heater unit having the same according to
embodiments of the present disclosure will be described with reference to accompanying
drawings.
[0028] Fig. 1 is a flow chart of a control method of a heat pump water heater unit according
to embodiments of the present disclosure. In the embodiments of the present disclosure,
the heat pump water heater unit may include a heat pump host, an electric auxiliary
heater and a water tank.
[0029] As illustrated in Fig. 1, the control method of the heat pump water heater unit may
include following operations.
[0030] At block S1, after receiving an off-peak electricity signal, a water temperature
of the water tank is obtained and it is determined whether the water temperature of
the water tank is less than a set temperature. The set temperature is a water temperature
required by a user. The set temperature can be manually set according to capacity
heating water of the heat pump water heater unit and practical requirements of the
user. For example, the set temperature can be in a range of 38°C to 75°C, and a default
value of the set temperature can be 55°C.
[0031] At block S2, when the water temperature is less than the set temperature, the heat
pump host is controlled to be in a turned-on state.
[0032] At block S3, a time period required for the water temperature of the water tank to
rise by a first pre-set temperature when both the heat pump host and the electric
auxiliary heater are turned on every first pre-set time period is calculated and recorded
as a first time period. The first pre-set time period and the first pre-set temperature
may be calibrated according to actual conditions. For example, the first pre-set time
period may be in a range of 1 min to 10 min, and the first pre-set temperature may
be in a range of 1°C to 2°C.
[0033] According to an embodiment of the present disclosure, calculating the time period
required for the water temperature of the water tank to rise by the first pre-set
temperature when both the heat pump host and the electric auxiliary heater are turned
on every first pre-set time period includes: determining whether the set temperature
is less than a maximum heating temperature of the heat pump host at a current outdoor
ambient temperature; when the set temperature is less than the maximum heating temperature
of the heat pump host at the current outdoor ambient temperature, calculating a remaining
total time period of the off-peak electricity according to the first pre-set time
period, and calculating the first time period according to the remaining total time
period of the off-peak electricity, the set temperature, and the water temperature
of the water tank; when the set temperature is greater than or equal to the maximum
heating temperature of the heat pump host at the current outdoor ambient temperature,
calculating the remaining total time period of the off-peak electricity according
to the time period required for the water temperature of the water tank to rise by
the first pre-set temperature when the electric auxiliary heater is turned on alone
and the first pre-set time period, and calculating the first time period according
to the remaining total time period of the off-peak electricity, the maximum heating
temperature of the heat pump host at the current outdoor ambient temperature, and
the water temperature of the water tank.
[0034] According to an embodiment of the present disclosure, when the set temperature is
less than the maximum heating temperature of the heat pump host at the current outdoor
ambient temperature, the first time period may be calculated according to following
formula (1):
where t is the first time period, H is a total time period of the off-peak electricity.
H can be set by the user through timing or be set according to a time period actually
provided by the power supply bureau, a value of H is generally in a range of 1 to
8 hours. TM is the first pre-set time period, n is a number of calculation times,
TS is the set temperature, and T5 is the water temperature of the water tank.
[0035] According to another embodiment of the present disclosure, when the set temperature
is greater than or equal to the maximum heating temperature of the heat pump host
at the current outdoor ambient temperature, the first time period may be calculated
according to following formula (2):
where
tde is the time period required for the water temperature of the water tank to rise by
the first pre-set temperature when the electric auxiliary heater is turned on alone.
Tstop is the maximum heating temperature of the heat pump host at the current outdoor
ambient temperature, i.e., a maximum temperature that the water in the water tank
can be heated by the heat pump host under different outdoor ambient temperature T4.
As illustrated in Fig. 2, Tstopg1, Tstopg2, ..., Tstopg13 are the maximum heating
temperature of the heat pump host under different outdoor ambient temperature T4.
For example, when 37°C≤T4<43°C, the maximum heating temperature of the heat pump host
is Tstopg1, when -14°C≤T4<-10°C, the maximum heating temperature of the heat pump
host is Tstopg13, when the outdoor ambient temperature T4 is greater than 43°Cor lower
than -14°C, the heat pump host does not work.
[0036] In detail, as illustrated in Fig. 3 and Fig. 4, after receiving the off-peak electricity
signal, the water temperature T5 of the water tank is obtained by a temperature sensor
in real time, and it is determined whether the water temperature T5 of the water tank
is less than the set temperature TS, or less than the set temperature TS - a startup
return difference temperature, in which the startup return difference temperature
can be calibrated according to actual situation. For example, the startup return difference
temperature can be in a range of 1 °C to 10 °C, and a default startup return difference
temperature can be 5 °C. When the water temperature T5 of the water tank is less than
the set temperature TS, it indicates that the current water temperature cannot satisfy
the user's demand. At this time, it is required to turn on the heat pump host, that
is, to control a compressor in the heat pump host to be turned on to heat the water
in the water tank.
[0037] After the heat pump host is turned on, the time period required for the water temperature
of the water tank to rise by the first pre-set temperature (e.g. 1°C) every time when
both the heat pump host and the electric auxiliary heater are turned on every first
pre-set time period (e.g. 5 min) is calculated according to the current heating condition,
and the time period is recorded as the first time period t. When calculating the first
time period t, a calculation manner of the first time period t is selected according
to a relationship between the set temperature TS and the maximum heating temperature
Tstop of the heat pump host at the current outdoor ambient temperature, so as to ensure
accuracy of calculating the first time period t.
[0038] As illustrated in Fig. 3, when TS < Tstop, there may be two kinds of heating conditions.
One is that the water in the water tank is able to be heated to the set temperature
TS within the total time period H of the off-peak electricity by turning on the heat
pump host alone, and the other is that the water in the water tank is able to be heated
to the set temperature TS within the total time period H of the off-peak electricity
by turning on the heat pump host alone for a while, then turning on both the electric
auxiliary heater and the heat pump host. Therefore, when calculating the first time
period t, the remaining total time period H' of the off-peak electricity may be first
calculated according to the first pre-set time period TM. For example, the remaining
total time period of the off-peak electricity H'=H
∗60-n
∗TM. Then the first time period t may be calculated according to the remaining total
time period H' of the off-peak electricity, the set temperature TS, and the water
temperature T5 of the water tank. For example, the first time period
[0039] As illustrated in Fig. 4, when TS≥Tstop, the case that that the water of the water
tank can be heated to the set temperature TS within the total time period H of the
off-peak electricity when the heat pump host is turned on alone may not occur, and
a case that, when both the heat pump host and the electric auxiliary heater is turned
on, the water temperature of the water tank has not reached the set temperature TS
while a temperature of the heat pump host has reached Tstop. At this time, the electric
auxiliary heater is required to be turned on alone to continue heating the water in
the water tank, such that the water temperature of the water tank can be heated to
the set temperature TS within the total time period H of the off-peak electricity.
That is, when TS≥Tstop, there may be two kinds of heating conditions. One is turning
on the heat pump host alone for a while, then turning on both the electric auxiliary
heater and the heat pump host. The other is turning on the heat pump host alone for
a while, then turning on both the electric auxiliary heater and the heat pump host
for a while, and finally controlling the electric auxiliary heater alone to be turned
on for a while. Therefore, in this case, when calculating the first time period t,
the heating condition when the electric auxiliary heater is turned on alone may be
taken into consideration. For example, the remaining total time period H' of the off-peak
electricity can be calculated according to a time period
tde required for the water temperature of the water tank to rise by the first pre-set
temperature when the electric auxiliary heater is turned on alone. For example, the
remaining total time period H' of the off-peak electricity=H
∗60-t
de∗(TS-Tstop)-n
∗TM. Then, the first time period t can be calculated according to the remaining total
time period H' of the off-peak electricity, the maximum heating temperature Tstop
of the heat pump host at the current outdoor ambient temperature, the water temperature
T5 of the water tank. For example, the first time period
[0040] At block S4, it is determined whether the first time period is less than a second
pre-set time period.
[0041] The second pre-set time period is a pre-set minimum time period required for the
water temperature of the water tank to rise by the first pre-set temperature when
both the heat pump host and the electric auxiliary heater are turned on. Considering
that the outdoor ambient temperature T4 has a certain influence on the heating capacity
of the heat pump host, that is, when both the heat pump host and the electric auxiliary
heater are turned on at different outdoor ambient temperatures T4, the time periods
required for the water temperature T5 of the water tank to rise by the first pre-set
temperature are different. Therefore, the minimum time period required for the water
temperature T5 of the water tank to rise by the first pre-set temperature can be determined
according to the current outdoor ambient temperature T4.
[0042] That is, according to an embodiment of the present disclosure, the second pre-set
time period may be a minimum time period required for the water temperature of the
water tank to rise by the first pre-set temperature when both the heat pump host and
the electric auxiliary heater are turned on at the current outdoor ambient temperature.
[0043] In order to simplify the calculation, as illustrated in Fig. 5, the outdoor ambient
temperature T4 may be partitioned, and the second pre-set time periods in each partition
are the same, as shown in Table 1:
Table 1
Code |
Meaning |
parameter value |
thd1e |
A minimum time period required for T5 to rise by 1 °C when both the heat pump host
and the electric auxiliary heater are turned on |
3.1min |
thd2e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
3.0min |
thd3e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
3.2min |
thd4e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
3.4min |
thd5e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
3.5min |
thd6e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
3.6min |
thd7e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
3.7min |
thd8e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
3.9min |
thd9e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
4.0min |
thd10e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
4.2min |
thd11e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
4.5min |
thd12e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
4.8min |
thd13e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
5.4min |
thd14e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
6.0min |
thd15e |
A minimum time period required for T5 to rise by 1°C when both the heat pump host
and the electric auxiliary heater are turned on |
6.4min |
tde |
A minimum time period required for T5 to rise by 1°C when the electric auxiliary heater
is turned on alone |
8.6min |
[0044] In Table 1, t
hd1e, th
d1e, ..., t
hd15e are respectively the minimum time periods (i.e. the second pre-set time periods)
required for T5 to rise by 1°C when both the heat pump host and the electric auxiliary
heater are turned on at different outdoor ambient temperatures corresponding to Fig.
5. For example, when the outdoor ambient temperature T4 < -3°C, the second pre-set
time period t
hd15e is 6.4 min; when 18°C< T4 < 21°C, the second pre-set time period t
hd7e is 3.7 min.
[0045] At block S5, when the first time period is less than the second pre-set time period,
the electric auxiliary heater is controlled to be in the turned-on state.
[0046] In detail, assuming that the current outdoor ambient temperature T4 is between 35
°C and 37 °C, the second pre-set time period t
hd1e can be obtained as 3.1min according to Table 1, and the maximum heating temperature
of the heat pump host can be obtained as Tstopg 2 according to Fig. 2. In addition,
assuming that the current number of calculations times is n=10, when TS<Tstopg2, the
first time period t can be calculated by the above formula (1): t=(H
∗60-TM
∗10)/(TS-T5). Then it is determined whether the first time period t is less than the
second pre-set time period t
hd1e. When the first time period t is less than the second pre-set time period t
hd1e, the electric auxiliary heater is controlled to be in the turned-on state. At this
time, both the heat pump host and the electric auxiliary heater heat the water in
the water tank. When TS≥Tstopg2, the first time period t can be calculated by the
above formula (2): t=[H
∗60-t
de∗(TS-Tstopg2)-10
∗TM]/(Tstopg2-T5). Then it is determined whether the first time period t is less than
the second pre-set time period t
hd1e. When the first time period t is less than the second pre-set time period t
hd1e, the electric auxiliary heater is controlled to be in the turned-on state. At this
time, both the heat pump host and the electric auxiliary heater heat the water in
the water tank.
[0047] Further, according to an embodiment of the present disclosure, after controlling
the electric auxiliary heater to be in the turned-on state, the method further includes:
when the set temperature is less than the maximum heating temperature of the heat
pump host at the current outdoor ambient temperature, controlling both the heat pump
host and the electric auxiliary heater to be in a turned-off state when the water
temperature in the water tank is greater than or equal to the set temperature; when
the set temperature is greater than or equal to the maximum heating temperature of
the heat pump host at the current outdoor ambient temperature, controlling the heat
pump host to be in the turned-off state when the water temperature of the water tank
is greater than or equal to the maximum heating temperature of the heat pump host
at the current outdoor ambient temperature, and controlling the electric auxiliary
heater to be in the turned-off state when the water temperature of the water tank
is greater than or equal to the set temperature.
[0048] In detail, as illustrated in Fig. 3, when TS<Tstop, during a process that both the
heat pump host and the electric auxiliary heater are turned on to heat the water in
the water tank, when the water temperature T5 of the water tank is greater than or
equal to the set temperature TS, both the heat pump host and the electric auxiliary
heater can be controlled to be in the turned-off state. As illustrated in Fig. 4,
when TS≥Tstop, during a process that both the heat pump host and the electric auxiliary
heater are turned on to heat the water in the water tank, when the water temperature
T5 of the water tank is greater than or equal to the maximum heating temperature Tstop
of the heat pump host at the current outdoor ambient temperature, the heat pump host
can be controlled to be in the turned-off state. That is, when the time period reaches
H
∗60-(TS-Tstop)
∗t
de, the heat pump host is controlled to be in the turned-off state. Then, the electric
auxiliary heater heats the water of the water tank alone until the water temperature
T5 of the water tank is greater than or equal to the set temperature TS, and then
the electric auxiliary heater is controlled to be in the turned-off state.
[0049] Therefore, with the control method of the heat pump water heater unit according to
the embodiments of the present disclosure, an exact opening time point of the electric
auxiliary heater is calculated based on a current heating rate, thus not only achieving
a purpose of energy saving, but also satisfying the user's requirement by heating
the water in the water tank to the set temperature within the total time period of
the off-peak electricity.
[0050] In order to make the present disclosure more clearly understood by those skilled
in the art, Fig. 6 is a flow chart of a control method of a heat pump water heater
unit according to an embodiment of the present disclosure. As illustrated in Fig.
6, the control method of the heat pump water heater unit may include the following
operations.
[0051] At block S101, after receiving an off-peak electricity signal, a water temperature
T5 of the water tank is obtained.
[0052] At block S102, it is determined whether T5 < TS holds. If yes, the operation at block
S103 is performed, otherwise, the operation at block S101 is performed.
[0053] At block S103, the heat pump host is controlled to be in a turned-on state.
[0054] At block S104, it is determined whether TS<Tstop holds. If yes, the operation at
block S105 is performed, otherwise, the operation at block S110 is performed.
[0055] At block S105, the first time period t is calculated according to the formula
[0056] At block S106, it is determined whether t<t
hdie holds, where t
hdie is the second pre-set time period at the current outdoor ambient temperature T4.
If yes, the operation at block S107 is performed, otherwise, the operation at block
S105 is performed.
[0057] At block S107, the electric auxiliary heater is controlled to be in the turned-on
state.
[0058] At block S108, it is determined whether T5≥TS holds. If yes, the operation at block
S109 is performed otherwise, the operation at block S107 is performed.
[0059] At block S109, both the heat pump host and the electric auxiliary heater are turned
off.
[0060] At block S110, the first time period t is calculated according to the formula
[0061] At block S111, it is determined whether t<t
hdie holds. If yes, the operation at block S112 is performed otherwise, the operation
at block S110 is performed.
[0062] At block S112, the electric auxiliary heater is controlled to be in the turned-on
state.
[0063] At block S113, it is determined whether T5≥Tstop holds. If yes, the operation at
block S114 is performed otherwise, the operation at block S112 is performed.
[0064] At block S114, the heat pump host is controlled to be in a turned-off state.
[0065] At block S115, it is determined whether T5≥TS holds. If yes, the operation at block
S116 is performed otherwise, the operation at block S114 is performed.
[0066] At block S116, the electric auxiliary heater is controlled to be in the turned-off
state.
[0067] In conclusion, with the control method of the heat pump water heater unit according
to the embodiments of the present disclosure, the water temperature of the water tank
is obtained after receiving the off-peak electricity signal. When the water temperature
of the water tank is less than the set temperature, the heat pump host is controlled
to be in the turned-on state. The time period required for the water temperature of
the water tank to rise by the first pre-set temperature when both the heat pump host
and the electric auxiliary heater are turned on is calculated every first pre-set
time period, and the time period is recorded as the first time period. When the first
time period is less than the second pre-set time period, the electric auxiliary heater
is controlled to be in the turned-on state. With the method, the opening of the electric
auxiliary heater is controlled according to the time period calculated in real time
and required for the water temperature of the tank to raise by the set temperature
when both the heat pump host and the electric auxiliary heater are turned on, thus
not only a purpose of saving energy can be achieved, but also the requirement of the
user for the water temperature can be satisfied.
[0068] Fig. 7 is a schematic diagram illustrating the structure of a heat pump water heater
unit according to an embodiment of the present disclosure. As illustrated in Fig.
7, the heat pump water heater unit may include a heat pump host 10, an electric auxiliary
heater 20 and a water tank 30. The electric auxiliary heater 20 may include one or
more heating tubes.
[0069] As illustrated in Fig. 7, a control device of the heat pump water heater unit may
include a temperature acquisition module 40 and a control module 50. The temperature
acquisition module 40 is configured to acquire a water temperature of a water tank
30. The control module 50 is respectively coupled to the temperature acquisition module
40, the heat pump host 10 and the electric auxiliary heater 20. The control module
50 is configured to determine whether the water temperature of the water tank 30 is
less than a set temperature after receiving an off-peak electricity signal. When the
water temperature is less than the set temperature, the control module 50 controls
the heat pump host 10 to be in a turned-on state, and calculates a time period required
for the water temperature of the water tank to rise by a first pre-set temperature
when both the heat pump host 10 and the electric auxiliary heater 20 are turned on
every first pre-set time period, records the time period as the first time period,
and determines whether the first time period is less than a second pre-set time period.
When the first time period is less than the second pre-set time period, the control
module 50 controls the electric auxiliary heater 20 to be in the turned-on state,
.
[0070] According to an embodiment of the present disclosure, when the control module 50
calculates the time period required for the water temperature of the water tank 30
to rise by the first pre-set temperature when both the heat pump host 10 and the electric
auxiliary heater 20 are turned on every first pre-set time period, the control module
50 determines whether the set temperature is less than a maximum heating temperature
of the heat pump host 10 at a current outdoor ambient temperature. When the set temperature
is less than the maximum heating temperature of the heat pump host 10 at the current
outdoor ambient temperature, the control module 50 calculates a remaining total time
period of the off-peak electricity according to the first pre-set time period, and
calculates the first time period according to the remaining total time period of the
off-peak electricity, the set temperature, and the water temperature of the water
tank 30. When the set temperature is greater than or equal to the maximum heating
temperature of the heat pump host 10 at the current outdoor ambient temperature, the
control module 50 calculates the remaining total time period of the off-peak electricity
according to the time period required for the water temperature of the water tank
30 to rise by the first pre-set temperature when the electric auxiliary heater 20
is turned on alone and the first pre-set time period, and calculates the first time
period according to the remaining total time period of the off-peak electricity, the
maximum heating temperature of the heat pump host 10 at the current outdoor ambient
temperature, and the water temperature of the water tank 30.
[0071] According to an embodiment of the present disclosure, when the set temperature is
less than the maximum heating temperature of the heat pump host 10 at the current
outdoor ambient temperature, the control module 50 can calculates the first time period
t according to above formula (1).
[0072] According to another embodiment of the present disclosure, when the set temperature
is greater than or equal to the maximum heating temperature of the heat pump host
10 at the current outdoor ambient temperature, the control module 50 can calculates
the first time period t according to above formula (2).
[0073] According to an embodiment of the present disclosure, the second pre-set time period
is a minimum time period required for the water temperature of the water tank 30 to
rise by the first pre-set temperature when both the heat pump host 10 and the electric
auxiliary heater 20 are turned on at the current outdoor ambient temperature.
[0074] According to an embodiment of the present disclosure, after the electric auxiliary
heater 20 is controlled to be in the turned-on state, when the set temperature is
less than the maximum heating temperature of the heat pump host 10 at the current
outdoor ambient temperature, the control module 50 controls both the heat pump host
10 and the electric auxiliary heater 20 to be in a turned-off state when the water
temperature of the water tank 30 is greater than or equal to the set temperature.
When the set temperature is greater than or equal to the maximum heating temperature
of the heat pump host 10 at the current outdoor ambient temperature, the control module
50 controls the heat pump host 10 to be in the turned-off state when the water temperature
of the water tank 30 is greater than or equal to the maximum heating temperature of
the heat pump host 10 at the current outdoor ambient temperature, and controls the
electric auxiliary heater 20 to be in the turned-off state when the water temperature
of the water tank 30 is greater than or equal to the set temperature.
[0075] It should be noted that, details not disclosed in the control device of the heat
pump water heater unit of the present disclosure may refer to the details disclosed
in the control method of the heat pump water heater unit of the present disclosure,
and details are not described herein again.
[0076] In conclusion, with the control device of the heat pump water heater unit according
to the embodiments of the present disclosure, the control module determines whether
the water temperature of the water tank is less than the set temperature after receiving
the off-peak electricity signal. When the water temperature is less than the set temperature,
the control module controls the heat pump host to be in the turned-on state. The time
period required for the water temperature of the water tank to rise by the first pre-set
temperature when both the heat pump host and the electric auxiliary heater are turned
on is calculated every first pre-set time period, and the time period is recorded
as the first time period. When the first time period is less than the second pre-set
time period, the control module controls the electric auxiliary heater to be in the
turned-on state. The device controls the opening of the electric auxiliary heater
according to the time period calculated in real time and required for the water temperature
of the tank to raise by the set temperature when both the heat pump host and the electric
auxiliary heater are turned on, thus not only a purpose of saving energy can be achieved,
but also requirement of a user for the water temperature can be satisfied.
[0077] Further, an embodiment of the present disclosure also provides a heat pump water
heater unit including the above-described control device of the heat pump water heater
unit. The heat pump water heater unit may be in a separated structure or an integral
structure, and may be a water circulation unit or a refrigerant circulation unit.
For example, the structure of the heat pump water heater unit may be as illustrated
in Fig. 7, and the specific structure will not be limited herein.
[0078] The heat pump water heater unit of the embodiments of the present disclosure controls
the opening of the electric auxiliary heater by the above control device by the time
period needed for the water temperature of the tank to raise by the set temperature
when the heat pump host and the electric auxiliary heater are turned on at the same
time in real-time, thus not only the purpose of saving energy can be achieved, but
also the requirement of a user for the water temperature can be satisfied.
[0079] In the description of the present disclosure, it is to be understood that, terms
such as "center", "longitudinal", "lateral", "length", "width", "thickness", "over",
"below", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom",
"in", "out", "clockwise", "anti-clockwise", "axial", "radial" and "circumference"
refer to the orientation and location relations as shown in the drawings. These relative
terms are for convenience of describing the present disclosure and for simplifying
the description, and do not intend to indicate or imply that the device or the elements
must have a specific orientation, be constructed and operated in a particular orientation,,
which could not to be understood to the limitation of the present disclosure.
[0080] In addition, terms such as "first" and "second" are used herein for purposes of description
and are not intended to indicate or imply relative importance or significance. Furthermore,
the feature defined with "first" and "second" may comprise one or more this feature
distinctly or implicitly. In the description of the present disclosure, "a plurality
of' means two or more than two, such as two or three, unless specified otherwise.
[0081] In the present disclosure, unless specified or limited otherwise, the terms "mounted,"
"connected," "coupled" and "fixed" and the like are understood broadly, and may be,
for example, fixed connections, detachable connections, or integral connections; may
also be mechanical or electrical connections, may also be direct connections or indirect
connections via intermediary, and further can be inner communications or interaction
relations of two components, which can be understood by those skilled in the art according
to t specific situations.
[0082] In the present disclosure, unless specified or limited otherwise, a first feature
is "on" or "below" a second feature may include an embodiment in which the first feature
is in direct contact with the second feature, and may also include an embodiment in
which the first feature and the second feature are not in direct contact with each
other, but are contacted via an additional feature formed therebetween. Furthermore,
a first feature is "on", "above", "over" a second feature may include an embodiment
in which the first feature is right or obliquely "on," "above," or "on top of' the
second feature, or just means that the first feature is at a height higher than that
of the second feature. The first feature is "below", "under" or "on bottom of' a second
feature may include an embodiment in which the first feature is right or obliquely
"below," "under," or "on bottom of' the second feature, or just means that the first
feature is at a height lower than that of the second feature.
[0083] In the description of the present disclosure, reference throughout this specification
to "an embodiment," "some embodiments," "an example," "a specific example," or "some
examples," means that a particular feature, structure, material, or characteristic
described in connection with the embodiment or example is included in at least one
embodiment or example of the present disclosure. Thus, the appearances of the phrases
such as "in some embodiments," "in one embodiment", "in an embodiment", "in another
example," "in an example," "in a specific example," or "in some examples," in various
places throughout this specification are not necessarily referring to the same embodiment
or example of the present disclosure. Furthermore, the particular features, structures,
materials, or characteristics may be combined in any suitable manner in one or more
embodiments or examples. Those skilled in the art can combine different embodiments
or examples described in the specification and the features of the different embodiments
or examples without departing from the scope of the present disclosure without contracting
each other.
[0084] Although explanatory embodiments have been shown and described, it would be appreciated
by those skilled in the art that the above embodiments cannot be construed to limit
the present disclosure, and changes, alternatives, and modifications can be made in
the embodiments without departing from scope of the present disclosure.
1. A control method of a heat pump water heater unit, wherein the heat pump water heater
unit comprises a heat pump host, an electric auxiliary heater and a water tank, the
control method comprises:
after receiving an off-peak electricity signal, obtaining a water temperature of the
water tank and determining whether the water temperature of the water tank is less
than a set temperature;
when the water temperature is less than the set temperature, controlling the heat
pump host to be in a turned-on state;
calculating a time period required for the water temperature of the water tank to
rise by a first pre-set temperature when both the heat pump host and the electric
auxiliary heater are turned on every first pre-set time period, and recording the
time period as a first time period;
determining whether the first time period is less than a second pre-set time period;
and
when the first time period is less than the second pre-set time period, controlling
the electric auxiliary heater to be in the turned-on state.
2. The control method according to claim 1, wherein calculating the time period required
for the water temperature of the water tank to rise by the first pre-set temperature
when both the heat pump host and the electric auxiliary heater are turned on every
first pre-set time period comprises:
determining whether the set temperature is less than a maximum heating temperature
of the heat pump host at a current outdoor ambient temperature;
when the set temperature is less than the maximum heating temperature of the heat
pump host at the current outdoor ambient temperature, calculating a remaining total
time period of the off-peak electricity according to the first pre-set time period,
and calculating the first time period according to the remaining total time period
of the off-peak electricity, the set temperature, and the water temperature of the
water tank;
when the set temperature is greater than or equal to the maximum heating temperature
of the heat pump host at the current outdoor ambient temperature, calculating the
remaining total time period of the off-peak electricity according to the first pre-set
time period and a time period required for the water temperature of the water tank
to rise by the first pre-set temperature when the electric auxiliary heater is turned
on alone, and calculating the first time period according to the remaining total time
period of the off-peak electricity, the maximum heating temperature of the heat pump
host at the current outdoor ambient temperature, and the water temperature of the
water tank.
3. The control method according to claim 2, wherein, when the set temperature is less
than the maximum heating temperature of the heat pump host at the current outdoor
ambient temperature, the first time period is calculated according to a following
formula:
where t is the first time period, H is a total time period of the off-peak electricity,
TM is the first pre-set time period, n is a number of calculation times, TS is the
set temperature, and T5 is the water temperature of the water tank.
4. The control method according to claim 2, wherein, when the set temperature is greater
than or equal to the maximum heating temperature of the heat pump host at the current
outdoor ambient temperature, the first time period is calculated according to a following
formula:
where t is the first time period, H is a total time period of the off-peak electricity,
tde is the time period required for the water temperature of the water tank to rise by
the first pre-set temperature when the electric auxiliary heater is turned on alone,
TS is the set temperature, Tstop is the maximum heating temperature of the heat pump
host at the current outdoor ambient temperature, n is a number of calculation times,
TM is the first pre-set time period, and T5 is the water temperature of the water
tank.
5. The control method according to any one of claims 1-4, wherein, the second pre-set
time period is a minimum time period required for the water temperature of the water
tank to rise by the first pre-set temperature when both the heat pump host and the
electric auxiliary heater are turned on at the current outdoor ambient temperature.
6. The control method according to any one of claims 2-4, after controlling the electric
auxiliary heater to be in the turned-on state, further comprising:
when the set temperature is less than the maximum heating temperature of the heat
pump host at the current outdoor ambient temperature, controlling both the heat pump
host and the electric auxiliary heater to be in a turned-off state when the water
temperature of the water tank is greater than or equal to the set temperature; and
when the set temperature is greater than or equal to the maximum heating temperature
of the heat pump host at the current outdoor ambient temperature, controlling the
heat pump host to be in the turned-off state when the water temperature of the water
tank is greater than or equal to the maximum heating temperature of the heat pump
host at the current outdoor ambient temperature, and controlling the electric auxiliary
heater to be in the turned-off state when the water temperature of the water tank
is greater than or equal to the set temperature.
7. A control device of a heat pump water heater unit, wherein the heat pump water heater
unit comprises a heat pump host, an electric auxiliary heater and a water tank, the
control device comprises:
a temperature acquisition module, configured to acquire a water temperature of the
water tank; and
a control module, wherein the control module is respectively coupled to the temperature
acquisition module, the heat pump host and the electric auxiliary heater, the control
module is configured to determine whether the water temperature of the water tank
is less than a set temperature after receiving an off-peak electricity signal, to
control the heat pump host to be in a turned-on state when the water temperature of
the water tank is less than the set temperature, to calculate a time period required
for the water temperature of the water tank to rise by a first pre-set temperature
when both the heat pump host and the electric auxiliary heater are turned on every
first pre-set time period, to record the time period as the first time period, to
determine whether the first time period is less than a second pre-set time period,
and to control the electric auxiliary heater to be in the turned-on state when the
first time period is less than the second pre-set time period.
8. The control device according to claim 7, wherein when the control module calculates
the time period required for the water temperature of the water tank to rise by the
first pre-set temperature when both the heat pump host and the electric auxiliary
heater are turned on every first pre-set time period,
the control module is configured to determine whether the set temperature is less
than a maximum heating temperature of the heat pump host at a current outdoor ambient
temperature;
when the set temperature is less than the maximum heating temperature of the heat
pump host at the current outdoor ambient temperature, the control module is configured
to calculate a remaining total time period of the off-peak electricity according to
the first pre-set time period, and to calculate the first time period according to
the remaining total time period of the off-peak electricity, the set temperature,
and the water temperature of the water tank; and
when the set temperature is greater than or equal to the maximum heating temperature
of the heat pump host at the current outdoor ambient temperature, the control module
is configured to calculate the remaining total time period of the off-peak electricity
according to the first pre-set time period and a time period required for the water
temperature of the water tank to rise by the first pre-set temperature when the electric
auxiliary heater is turned on alone, and to calculate the first time period according
to the remaining total time period of the off-peak electricity, the maximum heating
temperature of the heat pump host at the current outdoor ambient temperature, and
the water temperature of the water tank.
9. The control device according to claim 8, wherein, when the set temperature is less
than the maximum heating temperature of the heat pump host at the current outdoor
ambient temperature, the control module is configured to calculate the first time
period according to a following formula:
where t is the first time period, H is a total time period of the off-peak electricity,
TM is the first pre-set time period, n is a number of calculation times, TS is the
set temperature, and T5 is the water temperature of the water tank.
10. The control device according to claim 8, wherein, when the set temperature is greater
than or equal to the maximum heating temperature of the heat pump host at the current
outdoor ambient temperature, the control module is configured to calculate the first
time period according to a following formula:
where t is the first time period, H is a total time period of the off-peak electricity,
tde is the time period required for the water temperature of the water tank to rise by
the first pre-set temperature when the electric auxiliary heater is turned on alone,
TS is the set temperature, Tstop is the maximum heating temperature of the heat pump
host at the current outdoor ambient temperature, n is a number of calculation times,
TM is the first pre-set time period, and T5 is the water temperature of the water
tank.
11. The control device according to any one of claims 7-10, wherein, the second pre-set
time period is a minimum time period required for the water temperature of the water
tank to rise by the first pre-set temperature when both the heat pump host and the
electric auxiliary heater are turned on at the current outdoor ambient temperature.
12. The control device according to any one of claims 8-10, wherein, after controlling
the electric auxiliary heater to be in the turned-on state,
when the set temperature is less than the maximum heating temperature of the heat
pump host at the current outdoor ambient temperature, the control module is configured
to control both the heat pump host and the electric auxiliary heater to be in a turned-off
state when the water temperature of the water tank is greater than or equal to the
set temperature; and
when the set temperature is greater than or equal to the maximum heating temperature
of the heat pump host at the current outdoor ambient temperature, the control module
is configured to control the heat pump host to be in the turned-off state when the
water temperature of the water tank is greater than or equal to the maximum heating
temperature of the heat pump host at the current outdoor ambient temperature, and
to control the electric auxiliary heater to be in the turned-off state when the water
temperature of the water tank is greater than or equal to the set temperature.
13. A heat pump water heater unit, comprising the control device of a heat pump water
heater unit according to any one of claims 7-12.