[0001] The present invention relates to a heating apparatus for heating water for space
heating, comprising at least two substantially identical heating units which each
comprise a heat source and at least one heat exchanger thermally coupled to the heat
source.
[0002] Such heating apparatuses are known from NL-A-1003624.
[0003] This relates to a number of substantially identical heating units which are combined
subject to the output required from the heating apparatus. This form of modular construction
results in a simplification of production, design and logistics. The heating device
known from this publication is only suitable for heating water for a single purpose,
in this case space heating.
[0004] The present invention has for its object to provide such a heating apparatus which
is also suitable for simultaneous indirect heating of tap water and wherein the advantages
of a modular construction are retained.
[0005] This objective is achieved in that the heating units are divided into a first group
for space heating and into a second group for tap water heating, and in that the heating
apparatus comprises a regulating device for regulating the temperature of the heating
units of the first group and the temperature of the heating units of the second group
independently of each other.
[0006] As a result of these measures the advantages of a modular construction are retained,
while the advantages of a combined apparatus, such as a smaller and a cheaper apparatus,
are also retained.
[0007] It is pointed out herein that heating apparatuses for heating tap water and for heating
water for the purpose of space heating are of course per se known. Simultaneously
heating water to different temperatures for the purpose of tap water and space heating
is however not possible herewith.
[0008] In the heating of water for two different purposes, when the regulation of the temperature
is optimized for one purpose the optimization will not be complete for the other purpose.
With the partial measure that the heating apparatus comprises a regulating device
for regulating the temperature of the heating units of the first group and the temperature
of the heating units of the second group independently of each other, an optimization
can be obtained for both purposes, in this case space heating and tap water heating.
The efficiency of the total apparatus is hereby greatly increased.
[0009] This regulation has the result that the temperature of the units associated with
diverse groups can differ considerably. This can result in situations in which the
warmer unit supplies so much heat to an adjoining unit forming part of another group
and having a lower temperature that the water present in the colder unit will begin
to boil.
[0010] This is avoided in that the heating units forming part of the first group are thermally
insulated relative to the heating units forming part of the second group.
[0011] Disruptive heat flow is hereby prevented.
[0012] According to a preferred embodiment at least one of the heating units associated
with the first group is adapted to selectively heat water for heating tap water or
to heat water for space heating. This measure provides the option of temporarily increasing
the capacity of the heating device for space heating, for instance during heating
of an office building after the weekend.
[0013] It is also possible in principle to apply the reverse measure, although the practical
benefit hereof is not great. For tap water heating a buffer supply is in any case
usually present to offset peak loads.
[0014] It also possible in principle to temporarily use only one of the heating units of
the first group to heat tap water. This requires many valves however, and associated
regulation, so that this is less attractive in terms of cost.
[0015] It is however attractive to adapt all heating units forming part of the first group
to selectively heat water for heating tap water or to heat water for space heating.
[0016] Only little extra equipment is necessary for this purpose, while flexibility greatly
increases.
[0017] According to another preferred embodiment the regulating device is adapted to assign
priority to the demand for water for tap water heating over the demand for water for
space heating. It is here also the case that for the space heating a low output is
usually required for a long time, while the provision of tap water is maintained by
a buffer supply which is heated in a short time with a great output.
[0018] According to yet another embodiment the heating units are disposed adjacently of
each other and each of the heating units comprises two heat exchangers disposed on
either side of the heat source. This results in a space-saving and flexible arrangement.
[0019] According to another embodiment the heat exchangers of adjacent heating units forming
part of the same group are combined. This saves space.
[0020] According to a final embodiment a secondary heat exchanger is connected between the
heat exchangers of the units associated with the first group and the tap water circuit.
This offers the possibility of a free choice of the material for the primary heat
exchangers, since the tap water requirements no longer have to be taken into account.
[0021] The present invention will be elucidated hereinbelow with reference to the annexed
drawings, in which:
figure 1 shows a diagram explaining a first embodiment of the present invention;
figure 2 shows a diagram explaining a second embodiment of the present invention;
and
figure 3 shows a diagram explaining a third embodiment of the present invention.
[0022] Figure 1 shows the diagram of a heating apparatus designated in its entirety with
"1". The heating apparatus is formed by a number of substantially identical heating
units 2 disposed adjacently of each other. Each heating unit 2 is formed by a heat
source in the form of a burner 3 and a heat exchanger 4 arranged on either side thereof.
[0023] In the heating apparatuses according to the present invention the heating units 2
are divided into different groups; i.e. a first group, shown on the right in figure
1, which is adapted for space heating, and the second group, placed on the left in
figure 1, which is adapted to heat tap water.
[0024] For this purpose heat exchangers 4 of the right-hand group of heating units are connected
to a water circuit 5 which forms part of a usual central heating installation.
[0025] Gas, or possibly another fuel, is herein supplied by means of a gas feed pipe 6 to
burners 3, which heat the heating units in question. In order to regulate the gas
supply a regulating device 7 is received in pipe 6. A plurality of regulators is of
course possible here, such as with thermostats which are arranged in diverse spaces,
and combinations hereof.
[0026] The left-hand part of the array of heating units 4 is connected to a circulation
water pipe system 8. This circulation water pipe system 8 leads to a secondary heat
exchanger 9, through the other side of which runs the tap water pipe system 10. This
construction provides the option of manufacturing the heat exchangers 4 from aluminium
or an alloy containing aluminium, which is attractive from a production viewpoint.
Since tap water may not run directly through such heat exchangers, separate additional
heat exchangers 9, manufactured from for instance copper, must be applied.
[0027] It is otherwise possible to manufacture the heat exchangers which serve to heat tap
water from a material which is suitable for passage of tap water without toxic or
hygienic problems. The separating heat exchanger is then omitted.
[0028] The burners 3 in question are connected to a gas feed pipe 11, in which is received
a regulating device 12 which is controlled by means of classic control parameters.
[0029] It will be apparent that as a consequence of this configuration the advantages of
a modular structure can be combined with the advantages of a separated, relatively
simple regulation which is controlled by a higher level main control.
[0030] These advantages are likewise obtained in the configuration shown in figure 2. The
components are designated herein with the same reference numerals as the components
in figure 1. The difference from the configuration shown in figure 1 is here there
is a specific separating heat exchanger 13. This separating heat exchanger 13 is assembled
from two halves 4a, which otherwise correspond with heat exchangers 4a, which are
otherwise also disposed in figure 1 on the ends of the array of heating units. These
"half" heat exchangers herein correspond to half the structure of the normal, full
heat exchangers 4. This configuration prevents a space for a unit remaining unused,
as can be seen in figure 1.
[0031] Figure 3 shows a final configuration which otherwise corresponds with the configuration
shown in figure 2, but wherein the two left-hand heating units 2 can be used selectively
for space heating or for tap water heating. The choice hereof depends on the demand
for both types of heating, wherein normally these left-hand units are connected for
tap water heating, but when the demand for space heating is greater than can be generated
by the right-hand heating units, the space heating capacity can be increased temporarily,
albeit by decreasing the tap water heating capacity. For regulation use is made of
a three-way valve 15 which is controlled by a central control device 14, which otherwise
also controls regulating devices 7 and 12.
[0032] The demand for tap water however generally has a higher priority that the demand
for space heating.
[0033] Finally, it is pointed out that in the configuration shown in figure 3 all heating
units adapted to heat tap water can be used selectively for heating spaces. It is
however also possible to make only a part of the total number of heating units originally
suitable for heating tap water, switchable between both types of heating. This results
however in an even more complicated regulating and pipe structure.
1. Heating apparatus for heating water for space heating, comprising at least two substantially
identical heating units which each comprise a heat source and at least one heat exchanger
thermally coupled to the heat source, characterized in that the heating units are divided into a first group for space heating and into a second
group for tap water heating, and that the heating apparatus comprises a regulating
device for simultaneously regulating the temperature of the heating units of the first
group and the temperature of the heating units of the second group independently of
each other.
2. Heating apparatus as claimed in claim 1, characterized in that the heating units forming part of the first group are thermally insulated relative
to the heating units forming part of the second group.
3. Heating apparatus as claimed in claim 2, characterized in that at least one of the heating units associated with the first group is adapted to selectively
heat water for heating tap water or to heat water for space heating.
4. Heating apparatus as claimed in claim 3, characterized in that all heating units forming part of the first group are adapted to selectively heat
water for heating tap water or to heat water for space heating.
5. Heating apparatus as claimed in claim 3 or 4, characterized in that the regulating device is adapted to assign priority to the demand for water for tap
water heating over the demand for water for space heating.
6. Heating apparatus as claimed in any of the foregoing claims, characterized in that the heating units are disposed adjacently of each other and that each of the heating
units comprises two heat exchangers disposed on either side of the heat source.
7. Heating apparatus as claimed in claim 6, characterized in that the heat exchangers of adjacent heating units forming part of the same group are
combined.
8. Heating apparatus as claimed in any of the foregoing claims, characterized in that a secondary heat exchanger is connected between the heat exchangers of the units
associated with the first group and the tap water circuit.