JPH062980A - Absorption heat pump device - Google Patents

Abstract

(57) [Summary] [Objective] To provide a compact and highly efficient absorption heat pump device. [Composition] During cooling, the four-way valve 14 and the three-way valve 15 have the flow paths shown by the solid lines, and the refrigerant vapor generated in the generator 13 is condensed in the air-to-air heat exchanger 16 and then to the secondary fluid heat exchange. Bowl 1
8 and the absorbed liquid flows into the air absorber 19 through the three-way valve 15. During heating, the four-way valve 14 and the three-way valve 15 become the flow paths shown by the broken line, and the refrigerant vapor generated by the generator 13 is generated. Is condensed in the heat exchanger 18 for the secondary fluid, evaporated in the heat exchanger 16 for the air, and the absorbing liquid flows into the absorber 21 for the secondary fluid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption heat pump device which uses hot and cold heat obtained by pumping heat from a low temperature heat source using city gas or solar heat as a heat source.

[0002]

2. Description of the Related Art The structure of a conventional absorption heat pump device is shown in FIG. The concentrated solution having a high refrigerant concentration, which is pressurized by the solution pump 1, is heated in the solution heat exchanger 2 by the sensible heat of the dilute solution having a low refrigerant concentration flowing out from the generator 3, and then the generator. At 3, it is heated from the outside and a refrigerant vapor is generated.
The refrigerant vapor flows out to the condenser 4, and the dilute solution depleted in the refrigerant flows out to the solution heat exchanger 2. As described above, the dilute solution gives its sensible heat to the concentrated solution to lower the temperature, and then returns to the absorber 5. On the other hand, the refrigerant vapor that has flowed into the condenser 4 radiates heat to the outside and is liquefied. After that, the pressure is reduced by the expansion valve 6 and the temperature becomes low to enter the evaporator 7, which receives heat from the outside to evaporate and returns to the absorber 5. In the absorber 5, the dilute solution absorbs the refrigerant vapor,
The absorbed heat generated at that time is discarded to the outside.

When cooling or freezing is performed by the absorption heat pump as described above, the cold heat of the evaporator 7 is used, and when it is used for heating or hot water supply, the condenser 4 and the absorber 5 are used.
Use the heat of. At this time, cold heat and warm heat are carried to a place of use by a secondary fluid such as water or chlorofluorocarbon. For example,
When used for heating, the secondary fluid warmed by the heat of the condenser 4 and the absorber 5 is guided to the indoor unit 8 to warm the indoor air. Further, the secondary fluid, which has become low temperature due to the cold heat of the evaporator 7, flows into the heat exchanger 9 installed outdoors, and heat is recovered from the outdoor air. On the other hand, when it is used for cooling, the switching device 10 reverses the inflow location of the secondary fluid, the low temperature secondary fluid is guided to the indoor unit 8 to cool the indoor air, and the condenser 5 and the absorber 2 heat it. The obtained secondary fluid is caused to flow into the outdoor heat exchanger 9 to radiate heat to the outdoor air.

[0004]

However, in the conventional absorption heat pump device as described above, since the secondary fluid is used, (1) the temperature difference between the secondary fluid and the outside air is small, and a large transmission is achieved. A heat area is required, the heat exchanger 9 becomes large, and it is difficult to make the entire apparatus compact. (2) The efficiency of the heat pump is low. (3) Since the temperature of the secondary fluid on the low temperature side during heating is low, the viscosity of the fluid increases, and the capacity and power consumption of the pump for transporting the secondary fluid increase. There are issues such as.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a compact and highly efficient absorption heat pump device.

[0006]

According to the present invention, a generating means for generating a refrigerant vapor, a first heat exchanging means for exchanging heat between outside air and a refrigerant, and a direct or direct connection between indoor air and a refrigerant are provided. Second heat exchanging means for indirectly exchanging heat, first absorbing means for discharging absorbed heat to the outside air, second absorbing means for directly or indirectly discharging absorbed heat to indoor air, and their generating means, first A flow path for passing a refrigerant through the heat exchange means, the first absorption means, the second heat exchange means and the second absorption means, and when performing cooling, a generation means, a first heat exchange means, a second heat exchange means, First
When heating is performed by switching the flow paths so that the refrigerant can flow back in the order of the absorption means and the generation means, the refrigerant flows back in the order of the generation means, the second heat exchange means, the first heat exchange means, the second absorption means, and the generation means. It is an absorption heat pump device provided with a flow path switching means for switching a flow path so that the flow path can be switched.

[0007]

In the present invention, when the generating means generates the refrigerant vapor to perform cooling, the first heat exchange means releases the heat of the condensed refrigerant to the outside air, and the second heat exchange means evaporates the refrigerant. When the heat of the indoor air is directly or indirectly recovered, the first absorption means releases the absorbed heat to the outside air, the refrigerant returns to the generation means, and when heating is performed, the second heat exchange means collects the heat of the condensed refrigerant. The heat is directly or indirectly released into the room air, the first heat exchange means evaporates the refrigerant to recover the heat of the outside air, the second absorption means releases the absorbed heat into the room air, and the refrigerant returns to the generation means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments.

FIG. 1 is a block diagram of an absorption heat pump device according to an embodiment of the present invention. That is, the absorption heat pump device is provided with a solution pump 11 that delivers a concentrated solution having a high refrigerant concentration, and the solution pump 11 is connected to a solution heat exchanger 12 that receives heat from a dilute solution having a low refrigerant concentration. The solution heat exchanger 12 is connected to a generator 13, which is a generating means for generating a refrigerant vapor from a concentrated solution, and the generator 13 is connected to a four-way valve 14 that switches the flow path of the refrigerant vapor. One of the inlets and outlets of the four-way valve 14 is connected to the heat exchanger 16 for air constituting the outdoor unit, and the other one is 2
It is connected to a heat exchanger 18 for secondary fluid that exchanges heat with the secondary fluid, and the other one is connected to a three-way valve 15 that switches the flow passage provided at the inlet at the confluence with the dilute solution. There is. One of the outlets of the three-way valve 15 is connected to an air absorber 19 that constitutes an outdoor unit, and the other one of the outlets performs heat exchange with a secondary fluid.
It is connected to the absorber 21 for the next fluid. The absorber 19 for air and the absorber 21 for secondary fluid are connected to the solution pump 11.

The heat exchanger 16 for the air is connected to the expansion valve 17, and the expansion valve 17 is connected to the absorber 21 for the secondary fluid. The secondary fluid that exchanges heat with the heat exchanger 18 for secondary fluid and the absorber 21 for secondary fluid flows into the indoor unit 20 that exchanges heat with indoor air.

Next, the operation of the above embodiment will be described.

First, the concentrated solution having a high refrigerant concentration, which is pressurized by the solution pump 11, is generated in the solution heat exchanger 12 by the generator 13.
The temperature rises by receiving the sensible heat of the dilute solution having a low refrigerant concentration flowing out from the. After that, the generator 13 is heated from the outside to generate a refrigerant vapor. The refrigerant vapor generated next flows out to the four-way valve 14, and the dilute solution in which the refrigerant has run out is the solution heat exchanger 12.
Outflow to. The sensible heat of the dilute solution is given to the concentrated solution by the solution heat exchanger 12 and the temperature is lowered to the confluence of the inlet of the three-way valve 15.
The four-way valve 14 and the three-way valve 15 switch between cooling, heating, and deice modes. Hereinafter, each mode will be described in order.

During cooling, the four-way valve 14 is switched to the flow path shown by the solid line. Therefore, the refrigerant vapor that has exited the generator 13 flows into the air-to-air heat exchanger 16 that directly exchanges heat with the outdoor air, discards heat to the outside, and condenses. After that, the pressure is reduced by the expansion valve 17, the temperature becomes low, and the heat enters the heat exchanger 18 for the secondary fluid, receives the heat from the secondary fluid, and evaporates.
To the three-way valve 15. At the inlet of the three-way valve 15, the refrigerant vapor is in a gas-liquid two-phase state with the dilute solution flowing out from the solution heat exchanger 12. The flow path in the three-way valve 15 during cooling is switched as shown by the solid line, and the gas-liquid two-phase flow flows into the air-to-air absorber 19 that directly exchanges heat with the outdoor air. In the absorber 19 for air, the refrigerant vapor is absorbed by the dilute solution, and the heat of absorption generated at that time is discarded to the outside air. Therefore,
For condensation and absorption that exchange heat with outdoor air, see 2
Since the secondary fluid is not used, the temperature difference with the outdoor air is increased, and the heat transfer area required for heat exchange can be reduced. It is also possible to lower the condensation temperature and the condensation temperature. On the other hand, the cold water obtained in the heat exchanger for secondary fluid 18 is introduced to the indoor unit 20 and used for cooling the room.

In this embodiment, the heat exchanger 1 for air is used.
6 and the absorber 19 for air are shown as an integrated structure. The heat exchanger 16 for the air is located on the windward side of the outdoor air, and the absorber 19 for the air is located only on the windward side and most of it is on the leeward side. This is because the condensation temperature is constant, but the absorption temperature changes, and the high temperature part of the absorber has a temperature sufficiently higher than the condensation temperature.

During heating, the four-way valve 14 is switched to the flow path indicated by the broken line. Therefore, the refrigerant vapor that has exited the generator 13 flows into the heat exchanger 18 for the secondary fluid, and the heat is discharged to the secondary fluid and condensed. After that, the pressure is reduced by the expansion valve 17, the temperature becomes low, and the heat enters the heat exchanger 16 for the air. The refrigerant vapor becomes a gas-liquid two-phase state with the dilute solution at the inlet of the three-way valve 15. The flow path in the three-way valve 15 during heating is switched as shown by the broken line, and the gas-liquid two-phase flow flows into the anti-secondary fluid absorber 21. Therefore, regarding evaporation, which is a heat exchange with the outdoor air, the temperature difference with the outdoor air is large because the secondary fluid is not involved, so that the heat transfer area required for the heat exchange can be reduced. It is also possible to raise the evaporation temperature. On the other hand, the heat exchanger for secondary fluid 1
The hot water heated by the condensation heat and the absorption heat in 8 is guided to the indoor unit 20 and used for heating the room. In this embodiment, in order to prevent a decrease in efficiency, the condenser and the absorber are integrated so that both the heat of condensation and the heat of absorption are simultaneously given to the secondary fluid.

Although the air-to-air absorber 19 does not function during heating, as in this embodiment, the air-to-air heat exchanger 16 is integrated with the fins so that the fins are shared. The fins of the air absorber 19 are also lowered to near the evaporation temperature, and can function as a heat transfer surface with the outdoor air.

The deice is for removing the frost formed on the air heat exchanger 16 during heating.
Instead of switching the four-way valve 14 during heating, the flow path is indicated by the broken line, and the three-way valve 15 is switched to the flow path of the solid line. Therefore, although the flow of the refrigerant vapor does not change, heat radiation of the absorbing solution occurs in the air-absorbing absorber 19. This allows
The temperature of the heat exchanger 16 for air rises, and frost can be melted. Even at the time of de-ice, the heat exchanger 18 for secondary fluid can obtain hot water heated by the heat of condensation.
The room can be heated.

As described above, according to the present invention, the heat exchanger for air can be downsized and the entire apparatus can be made compact, and further, the condensation temperature / absorption temperature during cooling and the evaporation temperature during heating can be reduced. The heat pump efficiency can be improved. Further, since the power consumption of the pump that transports the secondary fluid is suppressed, a compact and highly efficient absorption heat pump device is provided.

In the above embodiment, the heat exchanger 16 for air which is the first heat exchanging means and the absorber 19 for air which is the first absorbing means are integrally formed. However, instead of this, They may be configured separately.

Further, in the above embodiment, the heat exchanger 18 for the secondary fluid which is the second heat exchange means and the absorber 21 for the secondary fluid which is the second absorption means are integrally formed. Alternatively, each may be configured separately.

Further, in the above embodiment, the four-way valve 14 and the three-way valve 15 are used as the flow passage switching means, but the present invention is not limited to this, and the flow passage of the refrigerant may be changed by another method as described above. Good.

In the above embodiment, the heat exchange with the room air is indirectly performed via the second fluid.
The configuration is not limited to this, and the heat may be directly exchanged with the refrigerant.

[0023]

As is apparent from the above description, the present invention provides the generating means for generating the refrigerant vapor, the first heat exchanging means for exchanging heat between the outside air and the refrigerant, the indoor air and the refrigerant. Second heat exchanging means for directly or indirectly exchanging heat between them, a first absorbing means for releasing absorbed heat to the outside air, a second absorbing means for directly or indirectly releasing absorbed heat to indoor air, and A flow path for passing a refrigerant through the generating means, the first heat exchanging means, the first absorbing means, the second heat exchanging means, and the second absorbing means, and when performing cooling, the generating means, the first heat exchanging means, the first heat exchanging means, When heating is performed by switching the flow paths so that the refrigerant can flow back in the order of the two heat exchange means, the first absorption means, and the generation means, the generation means, the second heat exchange means, the first heat exchange means, the second absorption means, Flow path switching that switches the flow paths so that the refrigerant can flow back in the order of the generation means Since a stage, it has an advantage that the efficiency is high in compact.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an absorption heat pump device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional absorption heat pump device.

[Explanation of symbols]

 13 Generator 14 Four-way valve 15 Three-way valve 16 Heat exchanger for air 18 Heat exchanger for secondary fluid 19 Absorber for air 21 Absorber for secondary fluid

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Nakagiri 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A generating means for generating a refrigerant vapor, a first heat exchanging means for exchanging heat between the outside air and the refrigerant, and a direct or indirect heat exchanging between the room air and the refrigerant. Second heat exchanging means, first absorbing means for releasing absorbed heat to the outside air, second absorbing means for directly or indirectly releasing the absorbed heat to the indoor air, their generating means, first heat exchanging means, When performing cooling with a flow path for passing the refrigerant through the first absorption means, the second heat exchange means, and the second absorption means,
When heating is performed by switching the flow paths so that the refrigerant can flow back in the order of the generation means, the first heat exchange means, the second heat exchange means, the first absorption means, and the generation means, the generation means A second heat exchange means, a first heat exchange means, a second absorption means, and a generation means, and a flow path switching means for switching the flow paths so that the refrigerant can flow back in that order. Absorption heat pump device. 2. The flow path switching means includes a four-way valve for switching the flow path of the refrigerant vapor flowing out from the generating means, and an inflow destination of the absorbing solution in which the refrigerant is absorbed, as the first absorbing means or the second absorbing means. The absorption heat pump device according to claim 1, further comprising a three-way valve for switching to the means. 3. The absorption heat pump device according to claim 1, wherein, when the heating is performed, the flow path switching means switches the second absorption means to the first absorption means. 4. The absorption heat pump device according to claim 1, wherein the first heat exchange means and the first absorption means are integrally configured. 5. The absorption heat pump device according to claim 1, wherein the second heat exchange means and the second absorption means are integrally configured.