BACKGROUND OF THE INVENTION
Field of the Invention
[0001] The present invention relates to a refrigerator and, more particularly, to a refrigerator
which is improved in terms of power consumption.
Discussion of the Related Art
[0002] Generally, a refrigerator includes a machine room in the lower region of a main body.
The machine room is generally installed in the lower region of the refrigerator, in
consideration of the center of gravity of the refrigerator, easy of assembly, and
vibration attenuation.
[0003] A refrigeration cycle device is installed in the machine room of the refrigerator
and serves to keep the interior of the refrigerator in a frozen or refrigerated state
using the characteristics of a refrigerant which absorbs external heat while varying
from a low-pressure liquid state to a gaseous state, thereby realizing the stable
storage of fresh food.
[0004] The refrigeration cycle device of the refrigerator includes, for example, a compressor
which changes a low-temperature and low-pressure gas phase refrigerant into a high-temperature
and high-pressure gas phase refrigerant, a condenser which changes the high-temperature
and high-pressure gas phase refrigerant, acquired from the compressor, into a high-temperature
and high-pressure liquid phase refrigerant, and an evaporator which absorbs external
heat while changing a low-temperature and high-pressure liquid phase refrigerant,
acquired from the condenser, into a gas phase refrigerant.
[0005] Recently produced refrigerators are increasing in storage capacity and, correspondingly,
tend to consume more power. Studies with the aim of reducing the power consumption
have been conducted.
[0006] A conventional refrigerator exhibits temperature distribution having the highest
temperature in the uppermost shelf of a storage compartment. However, the compressor
is driven based on the temperature of the upper region of the storage compartment
even through the lower region of the storage compartment has a lower temperature than
the upper region, which unnecessarily increases power consumption.
SUMMARY OF THE INVENTION
[0007] Accordingly, the present invention is directed to a refrigerator that substantially
obviates one or more problems due to limitations and disadvantages of the related
art.
[0008] One object of the present invention is to provide a refrigerator which is capable
of exhibiting reduced power consumption.
[0009] In addition, another object of the present invention is to provide a refrigerator
which is capable of achieving even temperature distribution within a storage compartment.
[0010] Additional advantages, objects, and features will be set forth in part in the description
which follows and in part will become apparent to those having ordinary skill in the
art upon examination of the following or may be learned from practice. The objectives
and other advantages may be realized and attained by the structure particularly pointed
out in the written description and claims hereof as well as the appended drawings.
[0011] To achieve these objects and other advantages and in accordance with the purpose
of the invention, as embodied and broadly described herein, in accordance with one
aspect of the present invention, a refrigerator includes a cabinet having a storage
compartment, a duct unit formed with a plurality of discharge holes for discharge
of cold air to the storage compartment, the duct unit providing a path for movement
of the cold air, a guide provided inside the duct unit, the guide being configured
to guide the cold air to be discharged to the storage compartment by dividing the
cold air, moving to the top of the duct unit, into opposite sides, and a compressor
configured to compress a refrigerant so as to supply the cold air to the duct unit,
wherein the guide includes a Phase Change Material (PCM) having a melting point at
a lower temperature than a temperature inside the storage compartment, the temperature
inside the storage compartment being set to initiate driving of the compressor.
[0012] The guide may undergo heat exchange with the cold air to be discharged to the storage
compartment within the duct unit.
[0013] The compressor may supply the cold air having a lower temperature than the melting
point of the phase change material, and the cold air, supplied to the storage compartment
while the compressor is operated, may be increased in temperature by the guide.
[0014] The storage compartment may be lowered in temperature by the guide while the compressor
is not operating.
[0015] The duct unit may include a duct cover configured to be exposed to the storage compartment,
a first insulation member attached to the back of the duct cover, and a second insulation
member installed to the back of the first insulation member so as to define a space
for passage of the cold air between the first insulation member and the second insulation
member, and the guide may be installed between the first insulation member and the
second insulation member.
[0016] The guide may include a tapered portion having an upwardly increasing cross sectional
width.
[0017] The guide may include a body charged with the phase change material, and the body
may have greater thermal conductivity than the phase change material.
[0018] The body may be formed of HDPE(5200B).
[0019] The body may not be charged in a lower end region thereof with the phase change material,
and a guide member having a prescribed volume may be provided in the lower end region
of the body.
[0020] The duct cover may be formed with a protrusion, and the first insulation member and
the guide may be respectively formed with through-holes for penetration and coupling
of the protrusion.
[0021] The discharge holes may be formed in the duct cover and the first insulation member,
and the discharge holes may be arranged at opposite sides of the guide interposed
therebetween.
[0022] The guide may have a lowermost end located lower than a lowermost one of the discharge
holes.
[0023] The storage compartment may be a refrigerating compartment, and the phase change
material may have a melting point near 0 °C.
[0024] The refrigerator may further include a temperature sensor configured to sense a temperature
inside the storage compartment, a fan installed in the duct unit, and a controller
configured to drive the fan when the temperature inside the storage compartment is
increased to a prescribed temperature or higher.
[0025] The discharge holes may be continuously kept in an open state.
[0026] In accordance with another aspect of the present invention, a refrigerator includes
a cabinet having a storage compartment, a duct unit formed with a plurality of discharge
holes for discharge of cold air to the storage compartment, the duct unit providing
a path for movement of the cold air, a guide provided inside the duct unit, the guide
being configured to guide the cold air to be discharged to the storage compartment
by dividing the cold air, moving to the top of the duct unit, into opposite sides,
and a compressor configured to compress a refrigerant so as to supply the cold air
to the duct unit, wherein the guide includes a Phase Change Material (PCM) having
a freezing point at a lower temperature than a temperature inside the storage compartment,
the temperature inside the storage compartment being set to initiate driving of the
compressor, and wherein the compressor supplies cold air having a lower temperature
than the freezing point of the phase change material.
[0027] The phase change material may accumulate cold air by being changed to a solid phase
while the compressor is driven.
[0028] The phase change material may discharge cold air by being changed to a liquid phase
while the compressor is not driven.
[0029] A temperature, set to cause the compressor to stop driving, may be lower than a temperature
set to initiate the driving of the compressor.
[0030] It is to be understood that both the foregoing general description and the following
detailed description of the present invention are exemplary and explanatory and are
intended to provide further explanation of the present invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] The accompanying drawings, which are included to provide a further understanding
of the present invention and are incorporated in and constitute a part of this application,
illustrate embodiment(s) of the present invention and together with the description
serve to explain the principle of the present invention. In the drawings:
FIG. 1 is a front view of a refrigerator according to an embodiment of the present
invention;
FIG. 2 is an exploded perspective view illustrating major components according to
the embodiment;
FIG. 3 is a detailed view of FIG. 2;
FIG. 4 is a view illustrating the coupled state of some major components according
to the embodiment;
FIG. 5 is a view illustrating a guide according to the embodiment; and
FIG. 6 is a control block diagram according to another embodiment.
DETAILED DESCRIPTION OF THE INVENTION
[0032] Hereinafter, exemplary embodiments of the present invention will be described with
reference to the accompanying drawings in order to concretely realize the objects
as set forth above.
[0033] The size, shape, or the like of components illustrated in the drawings may be exaggerated
for clarity and convenience of description. In addition, terms specially defined in
consideration of the configuration and operation of the present invention may vary
according to the intention of a user or an operator, or according to customs. Definitions
related to these terms should be based on the content throughout the specification.
[0034] FIG. 1 is a front view of a refrigerator according to an embodiment of the present
invention.
[0035] Referring to FIG. 1, the refrigerator according to the embodiment includes a cabinet
1 which defines the external appearance of the refrigerator.
[0036] The cabinet 1 is provided with a storage compartment 2 in which food may be stored.
[0037] The outer contour of the storage compartment 2 may be defined by an inner case 10
which is provided inside the cabinet 1. The inner case 10 may include an upper sidewall
12 and a lower sidewall 14, which form the inner surface of the storage compartment
2. The front side of the storage compartment 2 is open to allow a user to access the
storage compartment 2 through the open front side of the storage compartment 2.
[0038] The cabinet 1 is provided at the front side thereof with a first door 20, which is
pivotably installed to the cabinet 1 and is configured to open or close one side of
the storage compartment 2, and a second door 40 which is pivotably installed to the
cabinet 1 and is configured to open or close the opposite side of the storage compartment
2. At this time, when the first door 20 and the second door 40 close the front side
of the storage compartment 2, the storage compartment 2 may be completely sealed.
[0039] The second door 20 may be provided with a pillar 100, which rotates so as to come
into contact with the first door 20. The pillar 100 may generally have a cuboidal
shape, and may be coupled to the second door 40 so as to be rotatable relative to
the second door 40.
[0040] The first door 20 may be provided with a door dike 42, which defines the rear outer
contour of the first door 20. In addition, the second door 40 may be provided with
a door dike 22, which defines the rear outer contour of the second door 40.
[0041] Baskets 44 and 24 may be installed to the respective door dikes 42 and 22. The baskets
44 and 24 may be configured to store various shapes of food therein.
[0042] The storage compartment 2 may be provided with a first drawer 34, which is located
toward the first door 20, and a second drawer 32, which is located toward the second
door 40. At this time, the first drawer 34 and the second drawer 32 may be placed
in the same horizontal plane. That is, the first drawer 34 and the second drawer 32
may be located in left and right sides at the same height within the storage compartment
2. The first drawer 34 and the second drawer 32 may be pulled out independently of
each other.
[0043] A duct unit 200 is provided at the rear wall of the storage compartment 2, i.e. the
rear wall of the inner case 10. At this time, the duct unit 200 may serve as a passage
through which cold air, generated by a refrigeration cycle device that includes a
compressor 600 installed in a machine room, is supplied to the storage compartment
2.
[0044] A temperature sensor 400 may be installed in the storage compartment 2 to measure
the temperature inside the storage compartment 2. When the temperature inside the
storage compartment 2, measured by the temperature sensor 400, rises to a set temperature,
which is set either arbitrarily or by the user, the compressor 600 is driven to cool
the storage compartment 2 to the set temperature or lower.
[0045] The duct unit 200 may generally extend lengthwise in the direction perpendicular
to the longitudinal direction of the cabinet 1. Cold air supplied via the duct unit
200 may be supplied into the storage compartment 2 through a plurality of discharge
holes 212 which are provided at different heights inside the storage compartment 2.
[0046] That is, the discharge holes 212 formed at various heights allow the cold air to
be discharged at different heights within the storage compartment 2.
[0047] At this time, the storage compartment 2 may be a freezing compartment, but alternatively
may be a refrigerating compartment. When the storage compartment 2 is a refrigerating
compartment, cold air, which has a higher temperature than that in the freezing compartment,
is merely supplied into the storage compartment 2.
[0048] The discharge holes 212 may be open, without the installation of a separate closure
member, to provide continuous communication between the storage compartment 2 and
the interior of the duct unit 200.
[0049] FIG. 2 is an exploded perspective view illustrating major components according to
the embodiment, FIG. 3 is a detailed view of FIG. 2, and FIG. 4 is a view illustrating
the coupled state of some major components according to the embodiment.
[0050] Referring to FIGs. 2 to 4, a machine room 5 is formed in the lower region of the
cabinet 1 such that, for example, the compressor 600 used to compress a refrigerant
is installed in the machine room 5. A refrigeration cycle device, which includes,
for example, a condenser in addition to the compressor 600, may be installed in the
machine room 5.
[0051] The duct unit 200 may include a duct cover 210 which is exposed to the storage compartment
2, a first insulation member 220 attached to the back of the duct cover 210, and a
second insulation member 240 installed to the back of the first insulation member
220 so as to define a space for the passage of cold air between the first insulation
member 220 and the second insulation member 240.
[0052] At this time, the front surface of the duct cover 210 may be exposed to the outside
of the storage compartment 2. The discharge holes 212 are formed in the duct cover
210 such that cold air guided by the duct unit 200 may be supplied to the storage
compartment 2 through the discharge holes 212.
[0053] Because the discharge holes 212 formed in the duct cover 210 are arranged at different
heights, cold air is supplied to different height regions of the storage compartment
2 while the compressor 600 is driven, which allows the interior of the storage compartment
2 to be evenly cooled to a constant temperature.
[0054] The first insulation member 220 and the second insulation member 240 may have prescribed
thicknesses, which are required to prevent the cold air passing through the duct unit
200 from forming condensation due to the temperature difference between the duct unit
200 and the outside of the cabinet 1 or the storage compartment 2 located at the front
side of the duct cover 210.
[0055] Generally, when the compressor 600 is driven to supply cold air via the duct unit
200, the temperature of the cold air may be lower than the temperature inside the
storage compartment 2. In this case, the temperature difference between the front
side of the duct cover 210 (i.e. the interior of the storage compartment 2) and the
rear side of the duct cover 210 (i.e. the interior of the duct unit 200) increases,
thus causing condensation.
[0056] Meanwhile, the first insulation member 220 and the second insulation member 240 may
generally have a rectangular column shape in the coupled state thereof.
[0057] The first insulation member 220 is formed with discharge holes 222, which are provided
in number and shape equal to the discharge holes 212 formed in the duct cover 210
and are located at positions corresponding to the discharge holes 212 formed in the
duct cover 210.
[0058] Accordingly, cold air, moved to between the first insulation member 220 and the second
insulation member 240, may pass through the discharge holes 222 formed in the first
insulation member 220, and may thereafter be supplied to the storage compartment 2
through the discharge holes 212 formed in the duct cover 210.
[0059] The discharge holes 212 and 222 may be located at opposite sides of a guide 230 interposed
therebetween. As such, the air, discharged through the discharge holes 212 and 222,
may easily undergo heat exchange thanks to the guide 230.
[0060] Meanwhile, the guide 230 may be installed between the first insulation member 220
and the second insulation member 240 and serve to guide the cold air passing through
between the first insulation member 220 and the second insulation member 240. The
guide 230 may be received in the duct unit 200 to guide the cold air so that it is
discharged to the storage compartment 2.
[0061] The duct cover 210 may be formed with a discharge port 214, which protrudes toward
the rear surface of the duct cover 210, and the first insulation member 220 and the
guide 230 may be formed with respective through-holes 224 and 234, through which the
discharge port 214 penetrates and is coupled.
[0062] Since the discharge port 214 is inserted into and coupled to the through-holes 224
and 234, the duct cover 210, the first insulation member 220, and the guide 230 may
be easily positioned at desired positions so as to be coupled into a single member.
[0063] Referring to FIG. 4, the guide 230 is generally oriented lengthwise in the height
direction of the duct unit 200, but is shaped such that no structure is provided at
the lower end thereof.
[0064] The guide 230 may function to guide the cold air, which moves from the bottom to
the top of the duct unit 200, so that the cold air is divided into opposite directions.
As such, the duct unit 200 may evenly discharge the cold air, introduced from the
lower side thereof, through the discharge holes 212 that are formed in the duct cover
210 at different heights. At this time, the guide 230 may divide the cold air, moving
upward from the lower side of the duct unit 200, so as to move in opposite directions
from the center of the duct unit 200.
[0065] As exemplarily illustrated in FIG. 4, the cold air, introduced from the lower side
of the duct unit 200, may be divided into opposite sides of the guide 230, thereby
being supplied to the storage compartment 2 through the discharge holes 222 distributed
at different heights.
[0066] FIG. 5 is a view illustrating the guide according to the embodiment.
[0067] Referring to FIG. 5a, the guide 230 may include a body 231 which defines the outer
appearance of the entire guide 230, and a Phase Change Material (PCM) 233 inside the
body 231.
[0068] Meanwhile, the through-hole 234 is formed in the center of the guide 230 to allow
the discharge port 214 of the duct cover 210 to be inserted thereinto. At this time,
although the through-hole 234 is a hole formed in the front surface and the rear surface
of the guide 230, the body 231 may be formed so as to be sealed in order to prevent
the phase change material 233 received therein from leaking to the outside.
[0069] The guide 230 may have a tapered portion 232, the cross sectional width of which
gradually increases from the bottom to the top. At this time, the tapered portion
232 is a structure that is provided to sequentially cause variation in cross sectional
area in order to reduce momentum loss due to the resistance by the guide 230 when
the cold air, introduced from the lower side of the duct unit 200, moves to the top
of the duct unit 200.
[0070] The lowermost end of the guide 230 may be located lower than the lowermost one of
the discharge holes. This serves to increase the probability of heat exchange between
the guide 230 and the air supplied through the duct unit 200.
[0071] At this time, the body 231 may have greater thermal conductivity than that of the
phase change material 233. The phase change material 233 is a material that changes
between a liquid phase and a solid phase on the basis of a particular temperature,
and needs to be charged in the body 231.
[0072] The body 231 needs to successfully transfer variation in external temperature to
the phase change material 233. In order to efficiently use the phase change material
233, the body 231 may have greater thermal conductivity than that of the phase change
material 233, which ensures easy heat exchange between the outside and the phase change
material 233.
[0073] Specifically, the body 231 may be formed of HDPE(5200B). HDPE(5200B) has high stiffness
and shows good resistance at low temperatures as well as chemical resistance. HDPE(5200B)
is a material provided by HONAM PETROCHEMICAL CORP., and a detailed description thereof
will be omitted herein.
[0074] Of course, the body 231 needs to be stiff to some extent in order to prevent the
phase change material 233 from leaking to the outside due to external shocks or variation
in volume depending on temperature variation applied to the phase change material
233.
[0075] The phase change material 233 may have a melting point at a lower temperature than
the temperature inside the storage compartment 2, which is set to initiate the driving
of the compressor 600. The phase change material 233 may discharge a great amount
of cold air when changed from a solid phase to a liquid phase. While the compressor
600 is not driven and the temperature inside the storage compartment 2 is increasing,
the phase change material 233 may supply accumulated cold air to the storage compartment
2 so that the temperature inside the storage compartment 2 is increased slowly until
the temperature of the storage compartment 2 reaches the set temperature for the driving
of the compressor 600. In this way, the driving initiation time of the compressor
600 may be delayed, which may reduce power consumption.
[0076] Meanwhile, assuming that the storage compartment 2 is a refrigerating compartment,
which is a storage space in which food is stored at low temperatures above 0°C, the
phase change material 233 may have a melting point near 0 °C. The melting point refers
to the temperature at which the change from a solid phase to a liquid phase occurs.
The phase change material 233 may accumulate a greater amount of energy at the melting
point or the freezing point, at which phase change occurs, than at other temperatures,
and may then emit the energy to the outside. That is, when the melting point of the
phase change material 233 is near 0 °C, the phase change material 233 may absorb and
discharge a greater amount of cold air near 0 °C than that in a different temperature
variation range.
[0077] FIG. 5B illustrates an embodiment that is different from that of FIG. 5A. Therefore,
the following description focuses on the differences therebetween, and a description
of configurations that are the same will be omitted.
[0078] In FIG. 5B, the body 231, into which the phase change material 233 is inserted, forms
the upper region of the guide 230. The lower region of the guide 230, in which no
phase change material 233 is inserted, is formed of a guide member 239 having a prescribed
volume.
[0079] At this time, the guide member 239 may have the same shape as the lower region of
the body 231 of FIG. 5A. However, there is a difference in that no phase change material
is inserted in the guide member 239.
[0080] Generally, the storage compartment 2 shows a greater increase in temperature in the
upper region than that in the lower region as time passes in the state in which the
compressor 600 is not driven. This is because cold air has a strong tendency to stay
in the lower region, rather than the upper region. In the present embodiment, the
phase change material 233 is located at a relatively high height so that the temperature
inside the storage compartment 2 is maintained constant without deviation between
the upper region and the lower region due to the inclusion of cold air in the phase
change material 23 of the guide 230.
[0081] This is because the phase change material 233 may accumulate cold air, and therefore
the cold air may be supplied to the storage compartment 2 by the phase change material
233 when the temperature of the upper region of the storage compartment 2 increases.
[0082] Explaining the operating process according to the embodiment of the present invention
described above with reference to FIGs. 1 to 5, when the temperature of the storage
compartment 2 is increased in the state in which the compressor 600 is not driven,
cold air that has accumulated in the phase change material 233 may be supplied to
the storage compartment 2 through the discharge holes 212 and 222. While the temperature
of the storage compartment 2 is increasing, the storage compartment 2 has a relatively
high temperature and the phase change material 233 has a relatively low temperature,
which may cause natural convection between the storage compartment 2 and the phase
change material 233. Accordingly, an increase in the temperature of the storage compartment
2 is delayed compared to the case where no phase change material 233 is provided.
[0083] In this way, the frequency of the case where it is necessary to reduce the temperature
of the storage compartment 2 by driving the compressor 600 may be reduced, or the
driving initiation time of the compressor 600 may be delayed. That is, the total power
consumption of the refrigerator may be reduced by the cold air accumulated in the
phase change material 233.
[0084] FIG. 6 is a control block diagram according to another embodiment.
[0085] Referring to FIG. 6, the temperature sensor 400 may be provided to measure the temperature
inside the storage compartment 2. At this time, the temperature measured by the temperature
sensor 400 may be transmitted to a controller 300.
[0086] Meanwhile, the controller 300 may drive a fan 500, which is capable of creating airflow
within the duct unit 200, or may drive the compressor 600 in order to generate cold
air.
[0087] In the case where the temperature inside the storage compartment 2, as measured by
the temperature sensor 400, is a first set temperature or lower, the controller 300
may drive both the fan 500 and the compressor 600, or may drive only the compressor
600.
[0088] At this time, in the case where the temperature inside the storage compartment 2,
as measured by the temperature sensor 400, is a second set temperature or lower, the
controller 300 may drive only the fan 500, without driving the compressor 600.
[0089] Through the flow of air generated by the fan 500, the cold air accumulated in the
phase change material 233 of the guide 230 may be supplied to the storage compartment
2 through the discharge holes 212.
[0090] The first set temperature may be higher than the second set temperature. That is,
when the temperature inside the storage compartment 2 reaches the second set temperature,
which is a relatively low temperature, the controller 300 may drive only the fan 500
so as to cool the storage compartment 2 using the cold air that has accumulated in
the phase change material 233.
[0091] At this time, as the guide 230 undergoes heat exchange with the air discharged from
the duct unit 200 to the storage compartment 2, the temperature inside the storage
compartment 2 is lowered by the guide 230 while the refrigeration cycle device is
not operating.
[0092] Of course, even if the controller 300 does not drive the fan 500, since the duct
unit 200 and the storage compartment 2 are in communication with each other through
the discharge holes, the phase change material 233 maintains a relatively low temperature
and undergoes heat exchange with the surrounding air, thereby causing natural convection
with air received in the storage compartment 2.
[0093] That is, since the fan 500 is driven to artificially cause convection, or since natural
convection occurs even if the fan 500 is not driven, cooling of the storage compartment
2 may be implemented by the phase change material 233.
[0094] On the other hand, when the temperature inside the storage compartment 2 reaches
the first set temperature, which is a relatively high temperature, the controller
300 may drive only the compressor 600, or may drive both the compressor 600 and the
fan 500, so as to cool the storage compartment 2.
[0095] In this case, as the guide 230 undergoes heat exchange with the cold air discharged
from the duct unit 200 to the storage compartment 2, the temperature of the cold air
supplied to the storage compartment 2 may be increased by the guide 230 while the
refrigeration cycle device is operated. The temperature of the cold air may be increased
as the phase change material 233 is cooled because the cold air generated while the
compressor 600 is driven has a lower temperature than the temperature of the phase
change material 233.
[0096] When the compressor 600 is driven, the phase change material 233 may accumulate cold
air.
[0097] The cold air supplied while the compressor 600 is driven generally has a lower temperature
than the desired set temperature of the storage compartment 2. Thus, condensation
may occur at the exterior of the duct unit 200, and more particularly, at the front
surface of the duct cover 210 because of the considerable temperature difference between
the interior of the duct unit 200 and the exterior of the duct unit 200.
[0098] However, in the present embodiment, the temperature of the cold air passing through
the duct unit 200 may be increased via heat exchange with the phase change material
233, which may prevent condensation at the duct unit 200.
[0099] Meanwhile, the compressor 600 may supply cold air having a lower temperature than
the freezing point of the phase change material 233.
[0100] When controlling the temperature of the storage compartment 2, the temperature that
is set to cause the compressor 600, which has stopped, to again be driven, may be
lower than the temperature that is set to stop the driving of the compressor 600.
[0101] For example, the compressor 600 may be set to be driven when the temperature of the
storage compartment 2 reaches 1 °C. At this time, the cold air supplied to the storage
compartment 2 by the compressor 600 may be set to -1°C. Meanwhile, the compressor
600 may be set to stop driving when the temperature of the storage compartment 2 reaches
-0.5°C. The aforementioned temperatures are given by way of example, and it should
be noted that the actual temperatures may be changed in various ways in the present
invention.
[0102] In the case of the above-described embodiment, the freezing point (or the melting
point) of the phase change material 233 may be -0.75 °C, which is higher than the
temperature of the cold air supplied by the compressor 600. This is because the phase
change material 233 may accumulate a great amount of cold air at temperatures close
to the freezing point.
[0103] Accordingly, while the compressor 600 is driven, the phase change material 233 may
accumulate cold air by being changed to a solid phase. While the compressor 600 is
not driven, the phase change material 233 may discharge cold air by being changed
to a liquid phase, thereby allowing the temperature inside the storage compartment
2 to be maintained for a prescribed length of time.
[0104] As is apparent from the above description, according to the present invention, it
is possible to reduce the power consumption of a refrigerator.
[0105] In addition, according to the present invention, owing to the even temperature distribution
within a storage compartment, it is possible to prevent a compressor from being unintentionally
driven due to a relatively high temperature in some region of the storage compartment.
[0106] Although the exemplary embodiments have been illustrated and described as above,
of course, it will be apparent to those skilled in the art that the embodiments are
provided to assist understanding of the present invention and the present invention
is not limited to the above described particular embodiments, and various modifications
and variations can be made in the present invention without departing from the spirit
or scope of the present invention, and the modifications and variations should not
be understood individually from the viewpoint or scope of the present invention.
1. A refrigerator comprising:
a cabinet (1) having a storage compartment (2);
a duct unit (200) formed with a plurality of discharge holes (212, 222) for discharge
of cold air to the storage compartment (2), the duct unit (200) providing a path for
movement of the cold air;
a guide (230) provided inside the duct unit (200), the guide (230) being configured
to guide the cold air to be discharged to the storage compartment (2) by dividing
the cold air, moving to the top of the duct unit (200), into opposite sides; and
a compressor (600) configured to compress a refrigerant so as to supply the cold air
to the duct unit (200),
wherein the guide (230) includes a Phase Change Material (PCM) having a melting point
at a lower temperature than a temperature inside the storage compartment (2), the
temperature inside the storage compartment (2) being set to initiate driving of the
compressor (600).
2. The refrigerator according to claim 1, wherein the guide (230) undergoes heat exchange
with the cold air to be discharged to the storage compartment (2) within the duct
unit (200).
3. The refrigerator according to claim 2, wherein the compressor (600) supplies the cold
air having a lower temperature than the melting point of the phase change material,
and
wherein the cold air, supplied to the storage compartment(2) while the compressor
(600) is operated, is increased in temperature by the guide (230).
4. The refrigerator according to claim 2 or 3, wherein the storage compartment (2) is
lowered in temperature by the guide (230) while the compressor (600) is not operating.
5. The refrigerator according to any one of the claims 1 to 4, wherein the duct unit
(200) includes:
a duct cover (210) configured to be exposed to the storage compartment (2);
a first insulation member (220) attached to the back of the duct cover (210); and
a second insulation member (240) installed to the back of the first insulation member
(220) so as to define a space for passage of the cold air between the first insulation
member (220) and the second insulation member (240), and
wherein the guide (230) is installed between the first insulation member (220) and
the second insulation member (240).
6. The refrigerator according to any one of the claims 1 to 5, wherein the guide (230)
includes a tapered portion (232) having an upwardly increasing cross sectional width.
7. The refrigerator according to any one of the claims 1 to 6, wherein the guide (230)
includes a body (231) charged with the phase change material (233), and
wherein the body (231) has greater thermal conductivity than the phase change material.
8. The refrigerator according to claim 7, wherein the body (231) is formed of HDPE(5200B).
9. The refrigerator according to claim 7 or 8, wherein the body (231) is not charged
in a lower end region thereof with the phase change material, and a guide member (239)
is provided in the lower end region of the body (231).
10. The refrigerator according to any one of the claims 5 to 9, wherein the duct cover
(210) is formed with a protrusion (214), and
wherein the first insulation member (220) and the guide (230) are respectively formed
with through-holes (224, 234) for penetration and coupling of the protrusion (214).
11. The refrigerator according to any one of the claims 5 to 10, wherein the discharge
holes (212, 222) are formed in the duct cover (210) and the first insulation member
(220), and
wherein the discharge holes (212, 222) are arranged at opposite sides of the guide
(230) interposed therebetween.
12. The refrigerator according to claim 11, wherein the guide (230) has a lowermost end
located lower than a lowermost one of the discharge holes (212, 222) .
13. The refrigerator according to any one of the claims 1 to 12, wherein the storage compartment
(2) is a refrigerating compartment, and
wherein the phase change material has a melting point near 0 °C.
14. The refrigerator according to any one of the claims 1 to 13, further comprising:
a temperature sensor (400) configured to sense a temperature inside the storage compartment
(2);
a fan (500) installed in the duct unit (200); and
a controller (300) configured to drive the fan (500) when the temperature inside the
storage compartment (2) is increased to a prescribed temperature or higher.
15. The refrigerator according to any one of the claims 1 to 14, wherein the discharge
holes (212, 222) are continuously kept in an open state.