JPS5913668B2 - Absorption heat pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption heat pump that can generate high temperature water and cold water using the same equipment.

Conventionally, when it was desired to obtain hot water using cold source production equipment in an absorption refrigeration cycle, hot water was generated using the heat of steam generated in a generator, for example, but it was not possible to heat the solution in the generator. When using flooded water as a heat source, the temperature of the hot water obtained is lower than the temperature of the heat source hot water, and in particular, relatively low-temperature heat source hot water such as hot wastewater from power plants, which has recently become a problem for energy saving and pollution prevention, is used. In some cases, the temperature of the hot water obtained was so low that it had little utility value.

Therefore, in order to obtain particularly high-temperature water, a separate device from the air conditioning equipment was required.

The present invention eliminates the above-mentioned drawbacks of the conventional ones by switching a portion of the fluid path connecting the generator, condenser, absorber, and evaporator, and uses relatively low-temperature heating source energy to lower the heating source temperature. An object of the present invention is to provide an absorption heat pump that can generate a high temperature heat source and a cold source of lower temperature such as a cooling medium such as cooling water or air using the same equipment, and has an extremely simple structure. It is a purpose.

Another object of the invention is to provide generators, condensers, absorbers,
By switching part of the fluid path that connects the evaporator, the absorber and evaporator can be used when producing a cold source, and the absorber can be used as an evaporator and the evaporator can be used as an absorber when producing a hot source. When manufacturing a heat source, not only can a cold heat source such as cold water or cold air be obtained from the evaporator, but also when manufacturing a hot water heat source, the evaporator can be used as an absorber so that a hot heat source such as hot water or hot air can be obtained from the same equipment. By obtaining a cold source or a hot source, conventional equipment requires external piping for switching between cold and hot sources, but this is no longer necessary. Our goal is to provide simple and inexpensive machinery.

The present invention includes an absorption refrigeration system that has a generator, a condenser, an absorber, an evaporator, a solution path and a refrigerant path that connect these devices, and that produces a cold heat source in the evaporator. Sometimes, the solution path and the refrigerant path are switched so that the absorber performs an evaporator action and the evaporator performs an absorber action, and the refrigerant is heated in the absorber that performs an evaporator action. The absorption heat pump is characterized in that hot water is produced in the evaporator which performs an absorber function.

To explain the present invention with reference to the drawings, in FIG. 1, a generator G and a condenser C are connected by a steam pipe 1 to form a group of generators and condensers whose internal pressures are approximately equal L7. However, the absorber A and the evaporator E are connected by a steam pipe 2 to form a group of absorbers and evaporators having approximately the same internal pressure.

A dilute solution pipe 3 connects the absorber A and the generator G, and is divided into a pump circuit having a pump 19 and a valve 5 and a pump circuit having a valve 6.

4 is a concentrated solution pipe from the generator G, which is branched into a circuit 7 having a valve 8 and a circuit 20 having a valve 18.

During the cold source production cycle, the concentrated solution circuit 7 is connected to the spray circuit 21 of the absorber A through the valve 8, and during the hot source production cycle, the concentrated solution circuit 20 is connected to the spray circuit 22 of the evaporator E through the valve 18. Connected.

X is a heat exchanger between the dilute and concentrated solutions.

The pipe 9 is a refrigerant circuit from the concentrator C, and is branched into a circuit 11 having a valve 10 and a circuit 13 having a valve 12.

During the cold source production cycle, the refrigerant circuit 11 is connected to the evaporator E through the valve 10, while during the hot source production cycle, the refrigerant circuit 13 is connected to the absorber A through the valve 12.

A pump 14 with a lower circuit 15 of the evaporator E directs fluid from the evaporator E to the spray circuit 22 of the evaporator E through a withdrawal passage 16 with a valve 17 during the cold source production cycle.
During the heat source production cycle, it is connected to the dilute solution 3 through a withdrawal path 24 having a valve 23 to pump the solution.

A pump 19 with a circuit 25 at the bottom of absorber A connects the liquid from absorber A to pipe 9 through a withdrawal passage 26 with valve 5 during the cold source production cycle, while valve 6 is connected to the pipe 9 during the hot source production cycle. It is connected to the spray circuit 21 of the absorber A through a withdrawal path 27 to pump the liquid.

28 is a heating pipe of the generator G, through which steam, hot water, waste gas, etc. as a heating source is passed, 29 is a radiation pipe of the condenser C, through which cooling water, etc. is passed as a cooling medium, and 30 is a temporary combustion pipe of the absorber C', through which cold heat is passed. During the heat source production cycle, the absorber C' acts as an absorber through cooling water as a cooling medium, and during the heat source production cycle, hot water, steam, etc. is passed as a heating medium to act as an evaporator; During the cold heat source production cycle, the heat transfer tube of vessel E acts as an evaporator and passes through the cold water, cold air, etc. Allows wind etc. to pass through.

To explain the valve symbols and flow directions in the figure, the valves that open during the cold source production cycle are shown in white, the valves that close are shown in black, and the flow direction is shown in a single arrow.

Conversely, during the heat source production cycle, the white valves close and the black crushed valves open, so the flow direction is as shown by the double arrow.

To explain the effects of this embodiment, during the cold source production cycle, the valves 6, 12, 18, 23 are closed and the valves 5, 8, 10 are closed.
. A pump 19 is operated to form a cold source production cycle.

The dilute solution that has absorbed the refrigerant vapor in the absorber A is heated by the pump 19 with the circuit 25, passes through the withdrawal path 26 with the valve 5 and the dilute solution pipe 3 with the heat exchanger X, and enters the generator G, whereupon the refrigerant vapor evaporates. It is concentrated and returns to the absorber A through a concentrated solution pipe 4 passing through a heat exchanger X, a circuit 7 having a valve 8, and a spray circuit 21.

On the other hand, the refrigerant vapor evaporated in the generator G passes through the steam pipe 1, enters the condenser C, is cooled and condensed, and passes through the circuit 11 having the refrigerant pipe 9 and valve 10, enters the evaporator E, and is heated by the heat transfer tube 31. evaporate and, if necessary, operate pump 14 and close valve 1.
The liquid refrigerant is circulated through the circuit 16 having the refrigerant 7 and the spray circuit 22 to promote evaporation, and the refrigerant vapor passes through the steam pipe 2 and reaches the absorber A.

The cold water in the heat transfer tubes 31 is cooled by the heat of evaporation to obtain cold water that serves as a low-temperature heat source for air conditioning or other uses.

The absorption cycle at this time is a clockwise cycle as shown in FIG. 2, and the pressure PE of the absorber/evaporator group is kept lower than the pressure Pc of the generator/condenser group.

During a heat source production cycle in which high-temperature hot water is obtained and used for heating, etc., valves 8, 10, and 17°5 are closed, and valve 1 is closed.
8, 6, 12, and 23 are opened, the heating tube 28 is filled with hot water as a heating source such as waste hot water, the heat radiation tube 29 is filled with cooling water as a cooling medium, and the heat transfer tube 31 is filled with hot water as a heat source. 3
Pass heat source hot water such as waste water to 0, and pump 1
4 to form a heat source production cycle.

This cycle is a counterclockwise cycle as shown in FIG. 3, and the pressure PE of the absorber/evaporator group is maintained higher than the pressure PC of the generator/condenser group.

The refrigerant liquid in the condenser C is supplied to a circuit 1 having a refrigerant pipe 9 and a valve 12.
3, the absorber A acts as an evaporator, is heated by the hot water in the heat transfer tube 30, and evaporates, and if necessary, the pump 19
The liquid refrigerant is circulated through the circuit 27 having the valve 6 and the spray circuit 21 to promote evaporation, and the refrigerant vapor enters the evaporator E through the steam pipe 2.

On the other hand, the concentrated solution from generator G passes through concentrated solution tube 4 and heat exchanger
The refrigerant vapor is heated through a circuit 20 having a valve 18, passes through a spray circuit 22, and enters an evaporator E which acts as an absorber, absorbing the aforementioned refrigerant vapor.

At this time, since the PE is kept at high pressure, the solution is heated by absorption heat to a temperature corresponding to the boiling point rise, and the temperature becomes high, heating the heat transfer tube 31, and obtaining the required high temperature water as a heat source, which is higher in temperature than the heat source hot water. be able to.

The dilute solution that has absorbed the refrigerant is passed through a pump 14 having a circuit 15 to a circuit 24 having a valve 23 and a heat exchanger X.
It enters the generator G via the dilute solution tube 3 having a heating tube 28.
The concentrated solution is heated by hot water to generate steam and concentrate.
2 and then returns to the evaporator E again to repeat the cycle.

On the other hand, the refrigerant vapor generated in the generator G passes through the steam pipe 1, reaches the condenser C, is cooled and condensed by the cooling water in the heat radiation pipe 29, and enters the absorber A through the refrigerant pipe 9 and the circuit 13, repeating the cycle.

In the past, it was difficult to obtain a heat source with a higher temperature than the heating source and a cold source with a lower temperature than the cooling medium with a single device, as in this embodiment, and separate devices were required, but in this embodiment, The evaporator is used as an absorber during the cold source manufacturing cycle, and the evaporator is used as an absorber and a part of the circuit is switched during the hot source manufacturing cycle, so that a single machine with a simple structure can generate temperatures higher than the heating source. It is also possible to generate a high-temperature heat source with high utility value and to generate cold water at a lower temperature than the cooling medium.

Further, in this embodiment, the cold source and the hot source can be taken out from the evaporator as they are.

This eliminates the need for external large-diameter piping switching circuits, which were required in conventional systems to obtain cold and heat sources from separate devices, making it possible to provide inexpensive external equipment to customers. It is something.

According to the present invention, it is possible to provide an absorption heat pump with a simple and compact structure having the following excellent features:
It can be extremely effective in terms of practical use, energy recovery, and pollution prevention.

(1) It is now possible to use the same equipment to produce a heat source with a temperature higher than the heating source temperature and a cold source with a temperature lower than that of cooling water, which is a cooling medium, and (2) '-L The heat source and the cold source can be manufactured using the same device (evaporator), and (3) the heat pump device itself and the external connection piping mechanism have an extremely simple structure and are compact.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a flow sheet;
FIG. 2 is an absorption cycle diagram during the cooling cycle, and FIG. 3 is an absorption cycle diagram during the heating cycle. G... Generator, A... Absorber, C...
...Condenser, E...Evaporator, X...
・Heat exchanger, 1, 2...Steam pipe, 3...
・Dilute solution tube, 4...Concentrated solution tube, 14゜19...
...Pump, 5, 6, 8, 10, 12, 17゜18
．． 23...Buddha, 13, 15, 16, 20°24.
25, 26, 27... Piping, 21, 22...
...Spray circuit, 28...Heating tube, 29.
... Heat radiation tube, 30, 31 ... Heat exchanger tube.

Claims (1)

[Claims] 1 Equipped with an absorption refrigeration system that has a generator, a condenser, an absorber, an evaporator, and a solution path and a refrigerant path that connect these devices, and that produces a cold heat source in the evaporator, and when producing a hot heat source, The solution path and the refrigerant path are switched so that the absorber performs an evaporator action and the evaporator performs an absorber action, and the refrigerant is heated in the absorber that performs an evaporator action, and the refrigerant is absorbed. 1. An absorption heat pump characterized in that hot water is produced in the evaporator that performs an evaporative action.