JPS5914705B2 - Absorption heat pump - Google Patents

Description

[Detailed description of the invention] The present invention mainly uses combustion energy such as city gas, etc.
This invention relates to an absorption heat pump that performs heating, cooling, and hot water supply.

In recent years, due to the energy saving perspective and electric power situation, there has been a lot of research into single pumps that use the combustion energy of city gas or kerosene to perform air conditioning and heating.

That is, since heat pumps also utilize heat from air well water, solar heat, etc., they have a higher coefficient of performance than heating systems using boilers and can reduce fuel consumption.

The present invention relates to an absorption heat pump that uses air as a heat source.

FIG. 1 shows one of the cycles of a conventional air-source absorption heat pump.

1 is a heat medium boiler, 2 is a generator, 3 is an outside air side heat exchanger, 4
is an indoor air side heat exchanger, 5 is a cooling absorber, 6 is a heating absorber, 7 is a heat exchanger, 8 is a receiver, 9 is a pump, 1
0 is an expansion valve for cooling, 11 is an expansion valve for heating, 12 is a four-way valve, 13, 14.15 is a three-way valve, and 24.25 is a check valve.

The outside air side heat exchanger 3 functions as a condenser during cooling and as an evaporator during heating.

Further, the indoor air side heat exchanger 4 acts as an evaporator during cooling and as a condenser during heating.

The absorbers 5 and 6 are also air-cooled.

There are two absorbers: a cooling absorber 5 and a heating absorber 60.

Since indoor air is heated during heating, the coefficient of performance during heating increases.

Furthermore, the absorbers 5 and 6 have a structure as shown in the figure, with the lower side of the tube facing the solution side, making an air-cooled structure possible.

Since Freon-22 is usually used as a refrigerant, the generator 2 is heated in the °C heating medium boiler 1 via a heating medium in order to prevent local heating within the generator.

Note that the outside air side heat exchanger 3 and the cooling absorber 5 share a blower 16 and are integrated.

In addition, the indoor air side heat exchanger 4 and the heating absorber 6 are also connected to the blower 1.
7 is common and integrated.

The action is that the refrigerant, solution, heat medium, indoor air, etc. flow as shown by arrow 31 during cooling and as shown by arrow 32 during heating.

As mentioned above, although the absorption heat pump shown in FIG. 1 has various advantages, it also has the following three major drawbacks.

(1) Two absorbers are required.

(2) Three three-way valves 13, 14, and 15 are also required.

(3) Hot water, such as hot water, cannot be obtained from this heat pump.

The object of the present invention is to provide an absorption heat pump that eliminates the above three drawbacks.

FIG. 2 is a flow sheet of the heat pump of the present invention.

Components having the same functions in FIG. 1 and FIG. 2 are given the same reference numerals.

The solution in the generator 2 is heated by the heat medium boiler 1 via a heat medium to avoid local heating of the refrigerant such as Freon-22.

The dilute solution sent from the nozzle 18 to the generator 2 is heated by the heat of condensation of the heating medium, becomes a concentrated solution by evaporation of the refrigerant, is sent to the heat exchanger 7, is cooled, and is sent to the absorber 19.

At this point, the refrigerant vapor from the four-way valve 12 is absorbed and becomes a dilute solution again.

The absorbed heat generated during this absorption is cooled by the water supplied from the hot water tank 20 by the pump 21, and conversely, the supplied water is heated to become hot water and stored in the hot water tank 20.

On the other hand, the dilute solution is sent to the heat exchanger 7 by the pump 9, heated by the concentrated solution, and sent to the generator 2 again.

The flow of refrigerant is similar to that of a small vapor compression heat pump.

That is, if the pipe 22 is considered as a suction pipe of the compressor, and the pipe 23 is considered as a discharge pipe of the compressor, they are exactly the same.

During cooling, the flow is as follows: piping 23 → four-way valve 12 → outside air side heat exchanger 3 → check valve 24 → receiver 8 → expansion valve 10 → indoor air side heat exchanger 4 → four-way valve 12 → piping 22, and heat exchange on the indoor air side. The room air is cooled by the container 4.

During heating, the flow is as follows: piping 23 → four-way valve 12 → indoor air side heat exchanger 4 → check valve 25 → receiver 8 → expansion valve 11 → outside air side heat exchanger 3 → four-way valve 12 → piping 22, and heat on the indoor air side The exchanger 4 heats indoor air.

In particular, when the hot water supply load is small and the temperature inside the hot water supply tank 20 rises, such as during cooling, the control valve 26 opens and the hot water at the outlet of the absorber 19 is sent to the hot water cooler 27 for cooling.

This control is performed, for example, so that the absorber inlet temperature remains constant.

This hot water cooler 27 has an integral structure with the outside air side heat exchanger 3, and is cooled by the same blower 16.

Furthermore, the hot water tank 20 may be integrated with the hot water cooler 27, the outside air side heat exchanger 3, the expansion valve 11, the check valve 24, etc. into the heat pump main body.

As described above, the absorption heat pump of the present invention has the following excellent effects.

(1) Hot water supply is possible.

(2) The number of devices is small and single.

(3) There are few switching valves.

(4) It has a hot water cooler that uses a common outside air side heat exchanger and a blower, and by incorporating the hot water tank into these heat pump bodies, the entire system becomes simpler.

[Brief explanation of drawings]

FIG. 1 is a flow sheet diagram of a conventional absorption heat pump, and FIG. 2 is a flow sheet diagram of an absorption heat pump according to the present invention. 1... Heat medium boiler, 2... Generator, 3
...Outside air side heat exchanger, 4...Indoor air side heat exchanger, 5...Cooling absorber, 6...
...Heating absorber, 7...Heat exchanger, 8...
...Receiver, 9...Pump, 10...
... Expansion valve for cooling, 11 ... Expansion valve for heating, 1
2... Four-way valve, 13.14, 15... Three-way valve, 16° 17... Blower, 18... Nozzle, 19... Absorption Container, 20...Hot water tank, 21...Pump, 22゜23...
...Piping, 24,25...Check valve, 26.
... Control valve, 21 ... Hot water cooler, 31
．． 32...Arrow.

Claims (1)

[Claims] 1. Steam generator 2, outside air side heat exchanger 3, heat exchanger 7,
In an absorption heat pump consisting of an absorber 19, a load-side heat exchanger 4, and a solution path and a refrigerant path that connect these devices, during cooling, the outside air-side heat exchanger 3 and the load-side heat exchanger 4 are respectively absorption-type. The cooling liquid that acts as the condenser and evaporator of the beat pump cycle and cools the absorber 19 is cooled by outside air, and during heating, the outside air side heat exchanger 3 and the load side heat exchanger 4 each act as the evaporator of the absorption heat pump cycle. An absorption heat pump characterized in that the absorber 19 acts as a container and a condenser, and the cooling of the absorber 19 is performed by the hot water supply load. 2 steam generator 2, outside air side heat exchanger 3, heat exchanger 7,
In an absorption heat pump consisting of an absorber 19, a load-side heat exchanger 4, and a solution path and a refrigerant path that connect these devices, during cooling, the outside air-side heat exchanger 3 and the load-side heat exchanger 4 are respectively absorption-type. The cooling liquid that acts as a condenser and an evaporator in the heat pump cycle and cools the absorber 19 is cooled by outside air, and during heating, the outside air side heat exchanger 3 and the load side heat exchanger 4 act as evaporators in the absorption heat pump cycle. The absorber 19 is characterized in that the absorber 19 is cooled by the hot water supply load, and is equipped with a hot water cooler that shares a blower with the outside air side heat exchanger 3. , connect the absorber 19 and the hot water tank, and the hot water tank and the hot water cooler with piping,
An absorption heat pump characterized in that the absorber 19 can be indirectly cooled by a hot water cooler when the hot water temperature in the hot water tank is high by means of a valve inserted in the middle of the piping.