JPH10122678A - Heat pump type hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump type hot water supply device having a hot water supply system which makes it possible to provide high temperature hot water without lowering the efficiency of the heat pump. SOLUTION: This invention relates to a heat pump type hot water supply device provided with an heat gas engine 1 which operates on the heat from a combustor 61, heat conveyance circuits 44 and 41 connected to a heat radiation heat source 11 of this heat gas engine 1, a hot water supply heat exchanger 400 provided in the heat conveyance circuits 44 and 41 and a hot water supply circuit 402 which obtains hot water by supplying water to this hot water supply heat exchanger 400. A heat recovery heat exchanger 71, which recovers the waste heat of the combustor 61 is connected to the heat conveyance circuit 44. A heating medium passing by the heat conveyance circuits 44 and 41 is heated with the waste heat recovered with this heat recovery heat exchanger 71, which makes it possible to raise the temperature of hot water available from the hot water supply heat exchanger 400 and the hot water supply circuit 402.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for heating and hot water supply using a hot gas engine operated by external heat or power.

[0002]

2. Description of the Related Art Conventionally, there has been known a hot gas engine such as a Stirling cycle engine or an absorption refrigerating engine which performs cooling and heating by using a high-temperature heat source by combustion or the power of an electric motor as a driving source. A feature of this type of heat gas engine is that heat pump work is performed using a gas such as helium, nitrogen, or ammonia without using chlorofluorocarbon as a refrigerant. This type of hot gas engine has a drawback in that it cannot transfer cold and hot heat to a use side unit using a refrigerant as in a reverse Rankine type air conditioner using Freon.

Therefore, conventionally, a heat-absorbing heat source of a hot gas engine, a heat-dissipating heat source of a hot gas engine, a use-side heat exchanger, and a heat-source-side heat exchanger are connected by a pipe, and heat is transferred by cold and hot water. An air conditioner that performs the following has been proposed (for example, Patent No. 1)
No. 857581). In this air-conditioning apparatus, terminal devices such as a use-side unit and a heat-source-side unit are used for both cooling and heating. Therefore, a four-way valve is used to switch between the cold water circuit and the hot water circuit.

[0004] However, in the above-mentioned conventional configuration, the heat pumped from the room by the use side unit and the heat input to drive the heat cycle during the cooling are released to the outside air by the heat source side unit, so that the energy is effectively used. There is a problem that can not be achieved. In addition, even if an attempt is made to effectively use the above-mentioned heat, in the above-described conventional example, water is used as a heat transfer medium, and antifreeze is required to share the water for cooling and heating, and the water is used as hot water as it is. There is a problem that you can not.

[0005]

In order to solve this problem, a heat exchanger for hot water supply is provided in a heat transfer circuit connected to a heat source for heat dissipation, and external supply water or circulating water is passed through the heat exchanger for hot water supply. It is conceivable to construct a heating / hot water supply system. In this case, in the hot water supply device using the above-described hot gas engine, in order to raise the temperature of the hot water to, for example, about 80 ° C., the working gas temperature on the heat radiation side of the hot gas engine needs to be higher. There is a problem that the coefficient of performance (COP) of the hot gas engine is greatly reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat pump type hot water supply apparatus having a hot water supply system capable of obtaining high-temperature water without reducing the efficiency of the heat pump without overcoming the problems of the conventional example.

[0007]

In order to achieve the above object, the invention according to claim 1 provides a heat gas engine operated by heat from a combustor and a heat gas connected to a heat radiating heat source of the heat gas engine. In a heat pump type hot water supply apparatus including a transfer circuit, a hot water supply heat exchanger provided in the heat transfer circuit, and a hot water supply circuit that supplies water to the hot water supply heat exchanger to obtain hot water, Connecting a heat recovery heat exchanger that recovers the exhaust heat of the combustor, heating the heat medium passing through the heat transfer circuit by the exhaust heat recovered by the heat recovery heat exchanger,
The temperature of the hot water obtained in the hot water supply circuit can be increased.

According to a second aspect of the present invention, there is provided a hot gas engine operated by heat from a combustor, a heat transfer circuit connected to a heat radiating heat source of the hot gas engine, and a hot water supply heat provided in the heat transfer circuit. In a heat pump type hot water supply apparatus including an exchanger and a hot water supply circuit for supplying hot water to the hot water supply heat exchanger to obtain hot water, the heat transfer circuit includes a use side heat exchanger in parallel with the hot water supply heat exchanger. And a switching valve for switching the heat transfer circuit so that a heat medium can be supplied to the hot water supply heat exchanger and / or the use side heat exchanger, and the heat transfer circuit exhausts heat of the combustor. The heat recovery heat exchanger is connected to the heat recovery heat exchanger, and the heat medium passing through the heat transfer circuit is heated by exhaust heat recovered by the heat recovery heat exchanger, and the temperature of the hot water obtained in the hot water supply circuit and / or Use temperature in the use side heat exchanger It is characterized in that to enable temperature.

In these inventions, the heat medium heated by the heat radiating heat source of the hot gas engine enters the hot water supply heat exchanger through the heat transfer circuit. In this case, since the heat transfer circuit is provided with the heat recovery heat exchanger using the exhaust heat of the combustor, the heat medium is heated through the heat recovery heat exchanger and can be heated by the heat radiation heat source. Heated above temperature. Therefore, since the heat medium heated to a high temperature enters the hot water supply heat exchanger, the temperature of the water supplied to the hot water supply heat exchanger becomes high.
According to this, the temperature of the working gas of the hot gas engine does not increase, and the efficiency does not decrease.

A third aspect of the present invention is a heat gas engine operated by heat from a combustor, a heat transfer circuit connected to a heat radiating heat source of the heat gas engine, and a hot water supply heat provided in the heat transfer circuit. In a heat pump type hot water supply apparatus including an exchanger and a hot water supply circuit for supplying hot water to the hot water supply heat exchanger to obtain hot water, the hot water supply circuit uses heat exhausted from a combustor to recover heat. A heat exchanger is provided.

According to a fourth aspect of the present invention, there is provided a hot gas engine operated by heat from a combustor, a heat transfer circuit connected to a heat radiating heat source of the hot gas engine, and a hot water supply heat provided in the heat transfer circuit. In a heat pump type hot water supply apparatus including an exchanger and a hot water supply circuit for supplying hot water to the hot water supply heat exchanger to obtain hot water, the heat transfer circuit includes a use side heat exchanger in parallel with the hot water supply heat exchanger. And a switching valve for switching the heat transfer circuit so that a heat medium can be supplied to the hot water supply heat exchanger and / or the use side heat exchanger, and the hot water supply circuit is provided with a waste heat of the combustor. A heat recovery heat exchanger for heating hot water using the heat recovery heat exchanger is provided.

In these inventions, the heat medium heated by the heat radiation heat source of the hot gas engine enters the hot water supply heat exchanger through the heat transfer circuit and heats the water supplied to the hot water supply heat exchanger. According to this, hot water is obtained in the hot water supply circuit. The hot water passes through a heat recovery heat exchanger that utilizes the exhaust heat of the combustor, and is directly heated through the heat recovery heat exchanger. Therefore, the temperature of the water obtained in the hot water supply circuit becomes high. According to this, the temperature of the working gas of the hot gas engine does not increase, and the efficiency does not decrease.

[0013] The invention according to claim 5 is the invention according to claims 1 to 4.
Wherein the preheating heat exchanger for preheating the combustion air by using the exhaust heat of the combustor is provided in the combustor constituting the hot gas engine.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the configuration of an embodiment of a heat pump type air conditioner according to the present invention. In this circuit, a heat gas engine 1 using a heat pump of a Stirling cycle engine is used as a heat source. . The Stirling cycle hot gas engine 1 itself is known,
Although a detailed description is omitted, a high temperature side piston 3 and a low temperature side piston 5 are provided. The pistons 3 and 5 can operate with a 90 ° phase shift from each other, for example, when the high temperature side piston 3 reaches an intermediate position toward the top dead center, the low temperature side piston 5 reaches the top dead center. Are connected via a crank 7 driven by a motor 6.

Reference numeral 61 denotes a combustor, which heats the working gas (helium) pushed out by the high temperature side piston 3.

When the high-temperature side piston 3 and the low-temperature side piston 5 operate, the enclosed helium moves through the regenerator 9, and when passing through the regenerator 9, is heated or cooled, and Due to the volume change due to the movement of the piston,
Helium is boosted or depressurized. When the pressure of helium increases, the temperature rises and heat is released to the medium temperature heat exchanger 11, and when the pressure decreases, the temperature decreases and heat is absorbed from the low temperature heat exchanger 13.

That is, the low-temperature heat exchanger 13 is connected to the hot gas engine 1
, And the medium temperature heat exchanger 11 constitutes a heat radiation heat source of the hot gas engine 1.

According to this embodiment, there is provided an air conditioner 100 using the low-temperature heat exchanger (heat absorbing heat source) 13 and the medium-temperature heat exchanger (radiating heat source) 11 of the hot gas engine 1. You. The air conditioner 100 includes a use side unit 200 and a heat source side unit 300 including the hot gas engine 1. The use side unit 200 includes a use side heat exchanger 201 and an indoor fan 203. The heat source side unit 300 includes the hot gas engine 1 and the heat source side heat exchanger 3
01, an outdoor fan 303, a hot water pump 20, a cold water pump 21, and four-way valves 30, 31.

According to this embodiment, the intermediate temperature heat exchanger 1
A heat recovery heat exchanger 71 is connected to the heat transfer circuit 44 between the pump 1 and the hot water pump 20. This heat recovery heat exchanger 7
1 recovers exhaust heat of the combustor 61 included in the hot gas engine 1. Further, the combustor 61 is provided with a preheating heat exchanger 81 for preheating the combustion air sent from the blower 62 by using the exhaust heat of the combustor 61.

Four-way valves 30, 31 and use side heat exchanger 201
The heat transfer circuits 41 and 42 connecting the heat transfer circuits 41 and 42 have switching valves 63 and 6 for switching the heat transfer circuits 41 and 42 in three directions.
The hot water supply heat exchanger 400 is connected to the hot water supply heat exchanger 400 via a hot water supply circuit 5. The hot water supply circuit 402 includes an external water supply pipe 401 for guiding external supply water. 40
3 is a cook.

FIG. 1 shows a heating operation, and the heat transfer circuits 40 to 47 of FIG. 1 will be described with reference to flows of cold water and hot water during the heating operation. During the heating operation, the four-way valves 30, 31 are switched as shown by the solid line. In this case, the hot water radiated by the middle-temperature heat exchanger (radiating heat source) 11 is supplied to the pipe 44, the heat recovery heat exchanger 71, and the hot water pump 2.
0, the four-way valve 30, the pipe line 41, and the switching valve 63, flow to the use side heat exchanger 201, and the hot water supply heat exchanger 40
Flows to zero. The hot water flowing in the use side heat exchanger 201 performs heat exchange by rotating the indoor fan 203 there, and sends out warm air to the room (heating).
The flow returns to the intermediate temperature heat exchanger (radiation heat source) 11 through the switching valve 65, the four-way valve 31, and the pipe line 47.

The hot water flowing through the hot water supply heat exchanger 400 exchanges heat with water supplied through the external water supply pipe 401.
After the hot water is obtained through the hot water circuit 402, the hot water is returned to the intermediate heat exchanger (radiation heat source) 11 through the switching valve 65, the four-way valve 31, and the pipe line 47.

When only hot water is supplied, the switching valves 63, 6
5 is switched as shown in FIG. According to this, the hot water radiated by the middle temperature heat exchanger (radiating heat source) 11 is supplied to the pipe 44, the heat recovery heat exchanger 71, and the hot water pump 2.
It flows only to the hot-water supply heat exchanger 400 through the 0, four-way valve 30, the pipeline 41, and the switching valve 63.

The hot water flowing through the hot water supply heat exchanger 400 exchanges heat with water supplied through the external water supply pipe 401.
After the hot water is obtained through the hot water circuit 402, the hot water is returned to the intermediate heat exchanger (radiation heat source) 11 through the switching valve 65, the four-way valve 31, and the pipe line 47.

According to this embodiment, the switching valves 63, 6
By the switching of 5, it becomes possible to operate only the heating by using the use-side heat exchanger 201.

In such a case, the cold water absorbed by the low-temperature heat exchanger (heat source for heat absorption) 13 is supplied to the pipeline 40, the four-way valve 30,
After flowing through the pipe 45 to the heat source side heat exchanger 301 and performing heat exchange by rotating the outdoor fan 303, the low-temperature heat exchanger is passed through the pipe 46, the four-way valve 31, the cold water pump 21, and the pipe 43. Return to 13.

As described above, the circulation of the cold and hot water allows heat to be absorbed from the outside air through the heat source side heat exchanger 301, and the hot water supply heat exchanger 400 and the use side heat exchanger 201, or one of the heat exchangers 400, Waste heat due to the heat cycle is radiated through 201, and heating or hot water supply or simultaneous operation of heating and hot water supply is performed.

In the above, at the time of hot water supply, the external water supply pipe 4
01, the external water is supplied to the hot water supply heat exchanger 400, heated by the hot water passing therethrough, and used for hot water supply through the cock 403. However, under normal circumstances, the heating temperature in the hot water supply heat exchanger 400 cannot naturally exceed the heat radiation temperature there, and is about 30 ° C. to 50 ° C.
On the other hand, according to the present embodiment, the hot water supply heat exchanger 4
Since the temperature of the hot water supplied to the heat exchanger 00 can be increased, the heating temperature of the hot water supply heat exchanger 400 can be increased without increasing the temperature of the working gas in the intermediate temperature heat exchanger 11.

Therefore, by using the hot water supply circuit 402 without lowering the efficiency of the hot gas engine 1, for example, hot water of about 60 ° C. to 80 ° C. can be obtained.

According to this embodiment, the combustor 61 is provided with the preheating heat exchanger 81 for preheating the combustion air sent from the blower 62 by using the exhaust heat of the combustor 61. Therefore, the efficiency of the hot gas engine 1 can be increased.

During the cooling operation, as shown in FIG. 3, the four-way valves 30, 31 and the switching valves 63, 65 are switched. In this case, the cold water absorbed by the low-temperature heat exchanger (heat source for heat absorption) 13 reaches the four-way valve 30 through the pipe 40, flows into the use-side heat exchanger 201 through the pipe 41 and the switching valve 63, and there. After performing heat exchange and sending cool air into the room by rotating the indoor fan 203 (cooling), the low-temperature heat exchanger 13 is passed through the pipe 42, the switching valve 65, the four-way valve 31, the cold water pump 21, and the pipe 43. Return to

At this time, the intermediate-temperature heat exchanger (heat source for heat radiation) 1
The hot water radiated in 1 is supplied to the pipeline 44, the hot water pump 20,
The heat source side heat exchanger 3 through the four-way valve 30 and the pipe 45
01, where the heat is exchanged by rotating the outdoor fan 303, and then returns to the intermediate temperature heat exchanger 11 through the pipe 46, the four-way valve 31, and the pipe 47.

According to this, by circulating the cold and hot water, waste heat due to the heat cycle is radiated through the heat source side heat exchanger 301, and heat is absorbed from room air through the use side heat exchanger 201, so that the conditioned room is cooled. Cooling is performed.

In the above embodiment, the user side unit 2
00, since all devices except the hot water supply heat exchanger 400 are collectively housed inside the heat source side unit 300,
It can be designed to be compact.

Each pump and each four-way valve in each of the above embodiments are equipped with an actuator (not shown) for operating a valve or the like. And a control device (not shown) such as a microcomputer as control means for controlling as described above.

Although the present invention has been described based on the embodiments of the present invention, it is apparent that the present invention is not limited to the above embodiments.

For example, as shown in FIG. 4, a heat recovery heat exchanger 71 that directly heats hot water using the exhaust heat of the combustor 61.
Can be provided in the hot water supply circuit. In this case, the heat recovery heat exchanger 71 is disconnected from the heat transfer circuit, and is connected between the pipe 500 connected to the cock 403 of the hot water supply circuit and the hot water discharge pipe 501. In this case, since the hot water is directly heated by the heat recovery heat exchanger 71,
The exhaust heat of the combustor 61 can be used very effectively, and the energy saving effect is enormous.

In the above embodiment, the Stirling cycle heat pump is used as the hot gas engine 1. However, the heat gas engine 1 has a heat radiation heat source that can generate hot water and an heat absorption heat source that can generate cold water. Any device may be used as long as it has such a device as an absorption heat pump.

[0040]

As is apparent from the above description, since the heat transfer circuit is provided with the heat recovery heat exchanger utilizing the exhaust heat of the combustor, the heat medium is heated through the heat recovery heat exchanger. After being heated to a temperature higher than the temperature heated by the heat radiating heat source, it is supplied to the hot water supply heat exchanger and exchanges heat with the water supplied to the hot water supply heat exchanger. Hot water can be obtained. In this case, since the exhaust heat is recovered, the temperature of the working gas of the hot gas engine does not increase, and the efficiency does not decrease.

In these inventions, the heat medium heated by the heat radiating heat source of the hot gas engine enters the hot water supply heat exchanger through the heat transfer circuit and heats the water supplied to the hot water supply heat exchanger. Then, hot water is obtained in the hot water supply circuit. This hot water passes through a heat recovery heat exchanger using the waste heat of the combustor and is directly heated through the heat recovery heat exchanger, so that the temperature of the water obtained in the hot water supply circuit becomes even higher. In this case, the temperature of the working gas of the hot gas engine does not increase, and the efficiency does not decrease.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a heat pump type air conditioner of the present invention.

FIG. 2 is a circuit diagram at the time of hot water supply.

FIG. 3 is a circuit diagram during a cooling operation.

FIG. 4 is a circuit diagram showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot gas engine 11 Medium temperature heat exchanger (heat source for heat dissipation) 13 Low temperature heat exchanger (heat source for heat absorption) 40-47 Line 61 Combustor 62 Blower 63, 65 Switching valve 71 Heat recovery heat exchanger 81 Heat exchange for preheating Hot water supply heat exchanger 401 External water supply pipe

Claims (5)

[Claims] 1. A heat gas engine operated by heat from a combustor, a heat transfer circuit connected to a heat radiating heat source of the heat gas engine, a hot water supply heat exchanger provided in the heat transfer circuit,
In a heat pump type hot water supply apparatus including a hot water supply circuit for supplying hot water to the hot water supply heat exchanger and obtaining hot water, a heat recovery heat exchanger for recovering exhaust heat of the combustor is connected to the heat transfer circuit. A heat pump type hot water supply apparatus, wherein a heat medium passing through the heat transfer circuit is heated by exhaust heat recovered by the heat recovery heat exchanger, so that the temperature of hot water obtained in the hot water supply circuit can be increased. 2. A heat gas engine operated by heat from a combustor, a heat transfer circuit connected to a heat radiating heat source of the heat gas engine, a hot water supply heat exchanger provided in the heat transfer circuit,
In a heat pump type hot water supply apparatus having a hot water supply circuit for supplying hot water to the hot water supply heat exchanger and obtaining hot water, the heat transfer circuit connects a use side heat exchanger in parallel with the hot water supply heat exchanger. The hot water supply heat exchanger and / or
Or a switching valve for switching the heat transfer circuit so that a heat medium can be supplied to the use side heat exchanger, and a heat recovery heat exchanger that recovers exhaust heat of the combustor to the heat transfer circuit,
The heat medium passing through the heat transfer circuit is heated by the waste heat recovered by the heat recovery heat exchanger to increase the temperature of the hot water obtained in the hot water supply circuit and / or the use temperature of the use side heat exchanger. A heat pump water heater characterized by being made possible. 3. A heat gas engine operated by heat from a combustor, a heat transfer circuit connected to a heat radiating heat source of the heat gas engine, a hot water supply heat exchanger provided in the heat transfer circuit,
In a heat pump type hot water supply apparatus having a hot water supply circuit for supplying hot water to the hot water supply heat exchanger to obtain hot water, the hot water supply circuit includes a heat recovery heat exchanger that heats hot water by using exhaust heat of the combustor. A heat pump type hot water supply device characterized by having a water heater. 4. A heat gas engine operated by heat from a combustor, a heat transfer circuit connected to a heat radiating heat source of the heat gas engine, a hot water supply heat exchanger provided in the heat transfer circuit,
In a heat pump type hot water supply apparatus having a hot water supply circuit for supplying hot water to the hot water supply heat exchanger and obtaining hot water, the heat transfer circuit connects a use side heat exchanger in parallel with the hot water supply heat exchanger. The hot water supply heat exchanger and / or
Alternatively, a switching valve that switches the heat transfer circuit so that a heat medium can be supplied to the use side heat exchanger is provided, and the hot water supply circuit includes a heat recovery heat exchanger that heats hot water using exhaust heat of the combustor. A heat pump type hot water supply device characterized by being provided. 5. A preheating heat exchanger for preheating combustion air by utilizing exhaust heat of the combustor constituting the hot gas engine. A heat pump water heater according to any one of the above.