JP2000297938A - Heating system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a heating system in which heat transfer equipment does not require a separate transfer device such as a pump, and heat can be transferred to and from consumers through a single pipe. SOLUTION: A heat source (10) and steam generating means (1) for generating a heat medium vapor by heat supplied from the heat source (10).
2) and a heat storage tank (H, H) from the steam generating means (12).
1, H2, H3) and a heat medium pipe (L,
LH, LV, LB, 20), and the heat storage tanks (H, H1, H2, H3) have a heat storage material (MH) filled therein and inserted therein. And heat exchange between the heat medium vapor (VH) inside the heat medium pipe (20) and the heat medium pipe (L, LH, L).
-V, LB, 20) is a heat medium vapor (VH) inside
Flows toward the heat storage tanks (H, H1, H2, H3), and the liquid phase heat medium (LLH) flows toward the steam generator (12).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a heat transfer fluid,
The present invention relates to a heating system that transfers heat from a single heat source to a plurality of heat consuming units.

[0002]

2. Description of the Related Art Such a heating system is employed in an apartment house or the like. In FIG. 1, a heat source HG, a hot water storage tank 1, and a pump 2 are provided on a roof portion R of an apartment house denoted by reference numeral M as a whole, and the apartment house M is provided with a hot water piping system PL-S. Have been.

As the heat source HG, a boiler, a gas engine or other known members are used, and the tap water is heated to be hot water. This hot water is sent to hot water tank 1 via hot water line PL-1, where it is stored. Then, a head is added by the pump 2 via the hot water line PL-2 and sent to the hot water piping system PL-S. That is, in a heating system as shown in FIG. 1, heat energy is stored in the form of hot water sensible heat, and is conveyed in a reciprocating hot water circulation loop line. In this method, hot water is circulated and distributed sequentially from a consumer located close to the heat source to a distant place. In the consumer, circulating hot water is heated and used at an arbitrary time directly or via a heat exchanger.

FIG. 14 shows a hot water piping system PL-S constituting such a reciprocating hot water circulation loop line. In FIG. 14, the supply side (outgoing path) P of the hot water piping system PL-S
Between the L-SG and the return side (return route) PL-SR, each household that is a heat consuming destination in the apartment house M is denoted by the symbol FH.

[0005] However, in such a heating system of the reciprocating hot water circulation loop line system, every time the heating system is separated from the heat generating source (in FIG. 14, every time it goes to the right-hand heat-consuming home FH), the temperature increases with the heat loss. There is a problem that the level is lowered. In particular, the decrease in temperature level at the end consumer is serious.

In order to circulate hot water, a pump 2
(FIG. 1) must be driven, and the power consumption required thereby increases the operating costs of the heating system.

Further, when the hot water storage tank 1 as the heat storage facility is small, the follow-up performance when the heat utilization load increases rapidly is limited. On the other hand, if the equipment is prepared on the assumption that the heat utilization load is maximized, the problem of the following performance is avoided. However, a new problem arises in that the equipment required for the heating system becomes large.

When the reciprocating hot water circulation loop line system is adopted, two lines, an outgoing line and a returning line, are inevitably required. Providing such two lines in parallel greatly limits the layout as compared to providing only a single line (single line). At the same time, the installation cost increases.

In addition, the method of storing heat energy in the form of hot water sensible heat has the problem that the storage equipment becomes larger than other methods (for example, the method of storing heat energy in the form of latent heat). is there.

As another prior art, for example, Japanese Unexamined Patent Publication No.
Japanese Patent Application Publication No. 0-186626 proposes a technique in which saturated steam is conveyed to a heat radiating section, and condensed water is refluxed by a vacuum action during condensation. Thus, FIG. 15 shows a heating system that transfers heat to each home FM that is a heat consuming destination by using saturated steam. If the heat is transferred by steam as in the system shown in FIG. 15, only one transfer line is required, which is convenient.

However, in the system as shown in FIG. 15, the cogeneration facility and other heat source facilities (equipment corresponding to the heat source HG) cannot be established unless the temperature is at least 100 ° C. or higher. Therefore, in a system using the exhaust heat temperature of a polymer electrolyte fuel cell, which is expected to be particularly popular in the future, it is impossible to drive a conventional heating system that performs heat transfer using steam.

Still another prior art is disclosed in Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent Publication No. 264498, a heat transfer technique utilizing an endothermic / exothermic phenomenon at the time of occlusion / release of hydrogen or the like has been proposed. However, in order to apply such a technology to the existing heating system as described above, it is necessary to provide a hydrogen supply facility, which causes problems such as an increase in cost.

[0013]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and there is no need to separately provide a transfer device such as a pump in the heat transfer equipment, and a single pipe is provided. It aims to provide a heating system that can transfer heat to and from consumers.

[0014]

SUMMARY OF THE INVENTION A heating system according to the present invention includes a heat source, a steam generating means for generating a heating medium vapor by heat supplied from the heat source, and a heat storage tank from the steam generating means. A heat medium pipe connected to the heat storage tank so that the heat storage tank exchanges heat between the heat storage material filled therein and the heat medium vapor inside the heat exchanger inserted therein. The heat medium pipe is configured such that the heat medium vapor flows toward the heat storage tank and the liquid phase heat medium flows toward the steam generator inside the heat medium pipe.

According to the present invention having such a configuration, the heat medium vapor can be supplied to the heat storage tank by the pressure of the saturated vapor, so that a transport facility such as a pump is not required. Further, even if the distance between the heat source (steam generation source) and the consumer (such as a general household) is large, the influence of the distance is extremely small because the heat medium vapor is supplied by the pressure of the saturated vapor. According to the present invention, which does not require a transfer facility such as a pump, electric power and other motive power are unnecessary at least in terms of heat transfer, power can be saved, and the heat medium pump is completely free of trouble. is there. In addition, according to the present invention, the condensed heat medium is recovered by gravity, so that the pipe can be constituted by a so-called “single line”. Therefore, the layout of the heat medium piping is facilitated, and the installation cost is reduced.

Here, the heat storage tank is filled with a heat storage material having a melting point enough to be dissolved by the amount of heat held by the heat medium vapor supplied thereto, and the heat storage material and the refrigerant vapor exchange latent heat and latent heat. It is preferable to perform the following.

That is, according to the present invention, since heat energy can be stored in the form of latent heat (for example, heat of fusion) in the heat storage tank, compared with the hot water storage tank used in the related art of the hot water circulation type. The heat storage tank can be made much smaller.

Alternatively, in the present invention, a pipe for supplying water to the heat storage tank may be connected, and the supplied water may be filled in the heat storage tank as a heat storage material.

The heat medium pipe comprises a horizontal pipe, a vertical pipe, and a branch pipe. The vertical pipe is connected to the horizontal pipe via a bottom header. Preferably, the header is located above the steam generating means, and the horizontal pipe is preferably provided with a slope which descends toward the steam generating means.
Alternatively, the heat medium pipe is composed of a horizontal pipe, a vertical pipe, and a branch pipe, and the vertical pipe is connected to the horizontal pipe via a bottom header, and the bottom header is a steam pipe. It is located below the generating means,
A first pipe for passing a heat medium vapor through the horizontal pipe,
It is preferable that the second pipe for liquid-phase heat medium flow is divided into two.

In the present invention, a pipe for transferring heat from the heat source to the steam generating means is provided, and the pipe system is provided with a bypass pipe for bypassing the steam generating means, and an on-off valve is interposed in the bypass pipe. Preferably, the on-off valve is configured to open and close in response to the pressure in the steam generating means. In this way, the refrigerant vapor pressure can be kept constant.

Further, in the present invention, the steam generating means is thermally connected to a heat source, and is also thermally connected to a backup heat source.
It is preferable that the heat source be configured to be activated when the operation of the heat source is stopped. With such a configuration, for example, even during maintenance work on the heat source constituted by the fuel cell cogeneration apparatus, the steam generating means can be continuously operated by the backup heat source.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawings, similar members are denoted by similar reference numerals.

FIG. 1 shows an embodiment in which the heating system of the present invention is used for an apartment house. A plurality of consumer homes are occupied in an apartment house, which is entirely denoted by a symbol M, and each of the consumer homes has a heat storage tank H provided one by one.
Is represented by

In the embodiment of FIG. 1, the individual heat storage tanks H
Saturated steam generated by a heat medium (for example, a fluorocarbon-based material having a boiling point of 50 ° C. to 90 ° C.) that transports heat to the heat medium vapor or gas phase is generated by heat generated in the fuel cell cogeneration apparatus 10 (heat source). The heat medium is supplied from a steam generator 12 (steam generating means). That is, the heat medium steam (saturated steam) generated by the steam generator 12 is caused by its own pressure, in other words, by the so-called “self-pressure supply”, by the horizontal pipe LH, the vertical pipe LV, and the pipe L. Are sent to each heat storage tank H via a branch pipe LB that branches from -V to each heat storage tank H. Examples of the heat medium include not only the above-mentioned fluorocarbon-based substances having a boiling point of 50 ° C. to 90 ° C., but also water (water used under reduced pressure and having a boiling point lower than 100 ° C.), cyclopentane (Boiling point: 49 ° C.), hexane (boiling point: 64 ° C.), methanol (boiling point: 64 ° C.), ethanol (boiling point: 84 ° C.), etc. can also be used.

FIG. 2 shows a steam generator 12, pipes LH,
Pipes LH, LV, L-V, L-B, heat storage tanks H ...
A simplified model of only one heat storage tank H and the steam generator 12 is shown by a pipe L (pipe for heat medium) that comprehensively expresses LB. Here, “pipe for heat medium”
The pipe L, horizontal pipe LH, vertical pipe L-
V, a branch pipe LB, and a pipe 20 described later.
In FIG. 2, the vapor-phase heat medium or the heat medium vapor (arrow VH) generated from the steam generator 12 rises in the pipe L without separately providing a pump or the like due to a pressure difference or a density difference.
It reaches the heat storage tank H above the steam generator 12. The steam VH is deprived of heat of vaporization and condensed by supplying a retained amount of heat to a heat storage material (for example, alcohols having a melting point of about 60 ° C .; details will be described later) filled in the heat storage tank H. , Liquid heating medium (for example, liquefied Freon)
LLH. Since the liquid-phase heat medium LLH has a much higher specific gravity than the gas-phase heat medium VH, the liquid heat medium LLH moves down the pipe L by gravity and is returned to the steam generator 12. Here, the lowering of the condensed liquid-phase heat medium LLH is caused by the action of gravity, and the head is not added by a separately provided pump. In other words, in this case, it is not necessary to provide a separate pump.

The vapor heating medium VH and the liquid-phase heating medium LLH rise (by self-pressure supply) or descend (by gravity) without providing a separate pump or the like in the pipe L, so that the rising heat medium ( The vapor heat medium VH and the descending heat medium (liquid heat medium L)
LH) does not need to flow through separate pipes, but only needs to flow through the same pipe (the pipe indicated by the symbol L in FIG. 2). As the heat storage material, not only a paraffin-based material having a melting point of 60 ° C. but also, for example, octadecane (melting point 47
° C), cetyl alcohol (melting point 50 ° C), stearyl alcohol (melting point 59 ° C), and the like.

Here, the heat storage tank H is shown in FIG. In FIG. 3, for example, an alcohol having a melting point of about 60 ° C.
H. The heat medium pipe 20 connected to the branch pipe LB (communicating with the steam generator 12 shown in FIG. 1) is inserted into the heat storage tank H. On the other hand, a pipe 22 for supplying hot water to a consumer home provided with the heat storage tank H (a pipe for making hot water hot water by the heat storage tank H) is also inserted into the heat storage tank H. In FIG. 3, reference numeral 24 indicates a pump for adding a head to the tap water flowing through the pipe 22.

In the heat medium pipe 20, an area indicated by reference numeral 20E is illustrated like a heat exchanger. This is because the amount of heat held by the gas-phase heat medium (steam heat medium) VH rising in the pipe 20 is
The heat storage material MH filled in the heat storage tank H is supplied to melt the heat storage material MH (heat of fusion: supply of latent heat), and the vapor-phase heat medium VH itself is deprived of heat of vaporization (latent heat) and condensed. It is because it becomes the liquid phase heat medium LLH. That is, the region indicated by reference numeral 20E functions as a latent heat / latent heat exchanger. On the other hand, a pipe 22 for supplying hot water to the consumer home
The area designated by reference numeral 22E is also illustrated like a heat exchanger. This is because the amount of heat held by the melted heat storage material MH is supplied to the tap water flowing in the pipe 22 to increase the temperature of the tap water.

The upper end 23 of the heat medium pipe 20 is closed. As described above, the vapor heat medium VH that has risen to the heat medium pipe 20 via the pipe LB is condensed by performing latent heat / latent heat exchange with the heat storage material MH, and is condensed as a liquid-phase refrigerant. -Descend inside B. The heat storage tank H absorbs the peak of the amount of heat consumed by the consumer home day and night.

In the heat storage tank H shown in FIG. 3, latent heat / latent heat exchange is performed between the vapor heat medium VH and the heat storage material MH. On the other hand, in the heat storage tank H1 shown in FIG. 4, the heat storage material MH (for example, water in FIG. 4) is generated by the heat of vaporization (latent heat) of the steam heat medium VH.
Temperature (water temperature) rises (sensible heat), so that latent heat / sensible heat exchange is performed. 4, the configuration relating to the heat medium pipe 20 is the same as that of FIG. However, in FIG. 4, the configuration of a pipe 22 for supplying hot water to a consumer home is different. In FIG. 4, a pipe 22 is connected to a heat storage tank H.
The water supply region 22U and the downstream region 22D are provided separately. The water supplied to the heat storage tank H from the upper water side region 22U of the pipe 22 serves as the heat storage material MH.
Is filled in. Then, latent heat and sensible heat exchange with the heat medium vapor VH in the heat medium pipe 20 is performed, the (water temperature) rises, and the heat is sucked into the downstream region 22D of the pipe 22 via the strainer 25 by the pump 24. Are sent to a hot water load (not shown).

FIGS. 3 and 4 show that the heat storage tank H is used only for producing hot water supplied to a hot water load such as a hot water heater, but for hot water floor heating and reheating of a bath, etc.
In general, hot water is supplied from a pipe of a different system from the pipe 22. 5 and 6 show a heat storage tank in an embodiment in which two systems for supplying hot water to a hot water load are provided.

The heat storage tank H2 shown in FIG. 5 is of a type in which latent heat and latent heat exchange are performed between the heat medium pipe 20 and the heat storage material MH, similarly to the heat storage tank H shown in FIG. Steam generator 1
2 (FIG. 1) through the branch pipe LB to the heat medium pipe 20 in the heat storage tank H2 is, for example, 50 ° C.-90 ° C.
It is a heating medium vapor VH of a CFC-based substance having a boiling point of ° C.
Then, inside the heat storage tank H, for example, alcohols having a melting point of about 60 ° C. are filled as the heat storage material MH, and the heat medium vapor VH and the heat storage material MH exchange latent heat and latent heat,
The heat medium is condensed to become a liquid-phase heat medium LLH.
-It descends in B by gravity.

In the heat storage tank H2, a pipe 22 for supplying hot water to a consumer home and a pipe 2 of a different system from the pipe 22 are provided.
The piping 26 is provided for supplying hot water to hot-water floor heating, reheating of a bath, and the like. Reference numeral 28 denotes a pump for loading the head into the water flowing in the pipe 26. In the heat storage tank H2, the pipe 22 and the pipe 26 are supplied with the amount of heat (latent heat) possessed by the melted heat storage material MH, and the water temperature rises.
4 and 28, it is supplied to each heat load. For other configurations and operational effects, see FIG.
Is the same as

The heat storage tank H3 shown in FIG. 6 uses water as the heat storage material MH similarly to the heat storage tank H2 shown in FIG. 4, and heat medium vapor VH rising through the heat medium pipe 20 and heat storage material MH (water ) And latent heat / sensible heat exchange. In FIG. 6, the water supplied to the heat storage tank H from the upper water side region 22U of the pipe 22 is used as the heat storage material MH.
And exchanges latent heat and sensible heat with the heat medium vapor VH in the pipe 20, and the temperature (water temperature) rises.
It is sucked into the downstream area 22D of the pipe 22 via the strainer 25 and sent to a hot water load (not shown). Here, in the heat storage tank H2, there is a pipe 26 provided for supplying heat to hot-water floor heating, reheating of a bath, and the like, and water in the pipe 26 stores heat in the heat storage tank H2. It is heated by the hot water that is the material MH. Other configurations and operational effects are the same as those in FIG.

Horizontal piping LH, vertical piping L-
The movement of the heat medium in the V, the branch pipe LB, and the heat storage tank H has already been described in FIG. 2, but is particularly clearly shown in FIGS. 7 and 9. The heat medium vapor VH generated by the steam generator 12 (FIG. 1) is supplied to the heat storage tank H by self-pressure supply.
(H1, H2, H3), deprived of heat of vaporization, condensed, and as a liquid-phase refrigerant LLH, descends in the branch pipe LB and the vertical pipe LV by gravity to form the bottom header 3
Reach 4

Here, when the position of the bottom header 34 is higher than the steam generator 12 (see FIG. 1) not shown in FIG. 7, it is not explicitly shown in FIG. The horizontal pipe L-H is sloped (the bottom header 34 is up,
The steam generator 12 has a downward slope, and the bottom header 3
4 is configured so that the condensed heat medium LLH existing in 4 returns to the steam generator 12 by the action of gravity. At the same time, the diameter of the horizontal pipe L-H is increased, so that the steam heat medium VH flows toward the heat storage tank H in the area above the pipe L-H, and the liquid flows in the area below the pipe L-H. The phase refrigerant LLH is configured to flow toward the steam generator 12. In other words, when the bottom header 34 is above the evaporator 12 (FIG. 1), as shown in FIG.
By connecting only the book to the steam generator 12, the steam heat medium VH and the liquid phase heat medium LLH can be circulated.

On the other hand, when the bottom header 34 is located below the steam generator 12 (FIG. 1), for example, FIG.
As shown by, the horizontal pipe LH (FIG. 1) is divided into two pipes, the heat medium vapor VH flows through the upper pipe LH-1, and the liquid phase heat flows through the lower pipe LH-2. The medium LLH may be flown, and the liquid phase heat medium LLH may be recovered by the steam generator 12. That is, when the bottom header 34 is located below the steam generator 12 (FIG. 1), as shown in FIG.
-1, LH-2 must be connected to the steam generator 12. Although not shown in FIGS. 9 and 10, a pipe L-
A pump (not shown) is interposed in H-2.

In the embodiment shown in FIG. 11, the steam generator 12 is configured to maintain an appropriate heat medium vapor pressure. In FIG. 11, heat generated in the fuel cell cogeneration apparatus 10 is supplied to a liquid phase heat medium LLH stored in the steam generator 12 via a heat medium flowing through a line L10. Due to the amount of heat supplied from the fuel cell cogeneration apparatus 10 via the line L10, the liquid-phase refrigerant LLH is vaporized to generate a heat medium vapor,
It is supplied to the heat storage tank of each consumer home via the horizontal pipe LH.

Here, the line L10 is provided with a bypass line L12 (bypass pipe) for bypassing the steam generator 12, and an on-off valve 40 is interposed in the bypass line L12. The on-off valve 40 is electrically connected to a pressure sensor 42 via a signal transmission line CL- 1, and the pressure sensor 42 detects a pressure in the steam generator 12. Steam generator 12 via line L10
When the amount of heat supplied to the inside becomes excessive and the amount of heat medium vapor VH generated also becomes excessive, the pressure in the steam generator 12 increases.
This pressure increase is detected by the pressure sensor 42 and transmitted to the on-off valve 40 via the signal transmission line CL- 1 to open the on-off valve 40. When the on-off valve 40 is opened, the heat medium that carries the heat generated in the fuel cell cogeneration apparatus 10 flows through the bypass line L12, and the steam generator 1
Bypass 2. As a result, the amount of heat supplied to the steam generator 12 and the generation amount of the heat medium vapor VH are reduced, and the pressure in the steam generator 12 is maintained at an appropriate value or less.

In the embodiment shown in FIGS. 1 to 11, the heat generated by the fuel cell cogeneration system 10 is supplied to the steam generator 12 to generate a heat medium vapor. However, when the operation of the fuel cell cogeneration apparatus 10 is stopped due to periodic inspections such as maintenance of the fuel cell and other operations, heat is not supplied to the steam generator 12 and generation of heat medium vapor is also stopped. There is a risk that it will. FIG. 12 shows an embodiment capable of coping with such a situation.

In FIG. 12, a steam generator 12 is connected to a fuel cell cogeneration system 10 via a line L10.
(Heat source) and a line L30
Is also thermally connected to the backup heat source device 50 (backup heat source). Here, as the heat source 50 for backup, a known commercially available heat source can be used as it is. In addition, the backup heat source 50
It is preferable to select a type that is applicable to both permanent and temporary.

When the operation of the fuel cell cogeneration apparatus 10 is stopped due to periodic inspections such as maintenance of the fuel cell and other operations, the backup heat source unit 50 is stopped.
And the steam generator 12 has a backup heat source 5
Heat is input from 0 through line L30. As a result, it is possible to avoid a situation in which the steam heat medium is not supplied to the heat storage tanks H (H1, H2, H3). When the fuel cell cogeneration apparatus 10 is restarted, the backup heat source device 50 is stopped, and FIG.
Normal operation as shown in FIG.

The illustrated embodiment is merely an example,
It is noted that the description is not intended to limit the technical scope of the present invention. For example, in the illustrated embodiment, a fuel cell cogeneration device is used as a heat source, but a gas engine, a turbine, and other devices can be used. Further, the application of the present invention is not limited to an apartment house, but can be applied to a general house as long as a heat storage tank can be provided above a building.

[0044]

According to the present invention described above, since the heating medium vapor is supplied to the heat storage tank by the pressure of the saturated vapor, a transporting device such as a pump is not required, and for example, a conventional hot water circulation system is required. Transport power is not required. In addition, the adverse effect due to the distance between the heat source (steam generating source) and the consumer (general household or the like) is much smaller than that of the conventional hot water circulation type. Here, according to the present invention, it is possible to provide a heating system that transports heat using steam without providing a heat source that generates a very high temperature. According to the present invention, which does not require a transfer facility such as a pump, electric power and other motive power are not required at least for heat transfer, and heat can be used even during a power outage. Also,
Since no transport equipment such as a pump is required, there is absolutely no failure of the heat medium pump. Further, according to the present invention, since the heat storage tank is installed in the vicinity of the heat consumer (or a general household),
Since it is possible to quickly respond to the heat utilization at an arbitrary time of the consumer, the ability to follow a load change is greatly improved. At the same time, it is not necessary to receive heat from the heat medium on-time at the time of using heat, and it is possible to avoid concentration of heat use time. Or the heat use pattern of the consumer where the heat use time is concentrated,
It is possible to absorb a time difference from a heat source which is always supplied at a constant rate. As a result, the heat supply can be smoothed, and the utilization efficiency of the generated heat can be improved / improved. Further, according to the present invention, since the heat energy can be stored in the form of latent heat (for example, heat of fusion) in the heat storage tank, the heat storage tank is much smaller than the hot water storage tank used in the related art of the hot water circulation type. I can do it. In addition to this, according to the present invention, since the condensed heat medium is recovered by gravity, the pipe can be constituted by a so-called “single line”.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a diagram illustrating movement of a heat medium.

FIG. 3 is a diagram showing an example of a heat storage tank used in the present invention.

FIG. 4 is a view showing another example of the heat storage tank.

FIG. 5 is a view showing another example of the heat storage tank.

FIG. 6 is a view showing still another example of the heat storage tank.

FIG. 7 is a view showing movement of a heat medium between a heat storage tank and a horizontal pipe.

FIG. 8 is a view showing a connection state between a horizontal pipe and a steam generator used in the embodiment of FIG. 7;

FIG. 9 is a diagram showing movement of a heat medium between a heat storage tank and a horizontal pipe.

FIG. 10 is a view showing a connection state between a horizontal pipe and a steam generator used in the embodiment of FIG. 9;

FIG. 11 is a diagram showing another embodiment of the present invention.

FIG. 12 is a view showing still another embodiment of the present invention.

FIG. 13 is a diagram showing an example of the related art.

FIG. 14 is a diagram showing an example of a conventional technique for transferring heat by hot water.

FIG. 15 is a diagram showing an example of a conventional technique for transferring heat by steam.

[Explanation of symbols]

1: Hot water storage tank PL-S, PL-SG, PL-SR: Hot water piping system 2, 24, 28: Pump H, H1, H2, H3: Heat storage tank LH: Horizontal piping LV: Vertical piping LB ... Branch pipe 10 ... Fuel cell cogeneration apparatus 12 ... Steam generator VH ... Heat medium vapor LLH ... Liquid phase heat medium MH ... Heat storage material 20 ... Heat medium pipe 22 ... Consumer home provided with a heat storage tank Piping for supplying hot water 22U ... Water supply side area of pipe (22) 22D ... Downstream area of pipe (22) 26 ... Piping for supplying hot water to hot water floor heating, reheating of bath, etc. 34 bottom header L10, L30 line supplying heat to steam generator L12 bypass line 40 on-off valve 42 pressure sensor 50 backup heat source

Claims (7)

[Claims] A heat source, a steam generating means for generating a heat medium vapor by heat supplied from the heat source, and a heat medium pipe for thermally connecting the steam generating means to a heat storage tank. The heat storage tank is configured to perform heat exchange between a heat storage material filled therein and a heat medium vapor inside a heat exchanger inserted therein, and the heat medium pipe is A heating system in which the heat medium vapor flows toward the heat storage tank and the liquid phase heat medium flows toward the steam generator. 2. The heat storage tank is filled with a heat storage material having a melting point enough to be dissolved by the amount of heat held by the heat medium vapor supplied thereto, and the heat storage material and the refrigerant vapor exchange latent heat and latent heat. The heating system of claim 1, wherein the heating system is configured to: 3. The heating system according to claim 1, wherein a pipe for supplying water is connected to the heat storage tank, and the supplied water is filled in the heat storage tank as a heat storage material. 4. The heat medium pipe comprises a horizontal pipe, a vertical pipe, and a branch pipe, and the vertical pipe is connected to the horizontal pipe via a bottom header. The heating system according to any one of claims 1 to 3, wherein the header is located above the steam generating means, and the horizontal pipe is provided with a slope that descends toward the steam generating means. 5. The heat medium pipe comprises a horizontal pipe, a vertical pipe, and a branch pipe, and the vertical pipe is connected to the horizontal pipe via a bottom header. The header is located below the steam generating means, and the horizontal pipe is divided into a first pipe for flowing the heat medium vapor and a second pipe for flowing the liquid phase heat medium. The heating system according to claim 1, wherein the heating system is configured as follows. 6. A piping system for transferring heat from a heat source to a steam generating means, wherein the piping system is provided with a bypass piping for bypassing the steam generating means, and an on-off valve is interposed in the bypass piping. The heating system according to any one of claims 1 to 5, wherein the on-off valve is configured to open and close in response to a pressure in the steam generating means. 7. The steam generating means is thermally connected to a heat source and also thermally connected to a backup heat source, and the backup heat source is configured to operate when the operation of the heat source is stopped. The heating system according to any one of claims 1 to 6, wherein