JPS61213563A - Absorption refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an absorption refrigerator.

(Prior Art) L, Br--H2O absorption refrigerators are mainly of the dual-effect type, and various improvements have been made to improve their performance (coefficient of performance).

(Problems to be Solved by the Invention) However, the coefficient of performance (COP) of the dual-effect absorption refrigerator is approximately 1.2, which is close to the limit, and no further improvement can be expected.

(Means for Solving the Problems) The present invention provides a first high-pressure regenerator that heats a solution from an absorber using an external heat source, a compressor that compresses refrigerant vapor generated in the first high-pressure regenerator, and a compressor that compresses refrigerant vapor generated in the first high-pressure regenerator. a second heating solution from the first high-pressure regenerator using refrigerant vapor compressed by the refrigerant as a heat source;
A high-pressure regenerator, a low-pressure regenerator that heats the solution from the second high-pressure regenerator using refrigerant vapor generated in the second high-pressure regenerator as a heat source, and after the solution is heated in the second high-pressure regenerator and the low-pressure regenerator. a condenser that condenses the refrigerant and the refrigerant vapor generated in the low-pressure regenerator, and an evaporator that evaporates the liquid refrigerant from the condenser.

It consists of an absorber that absorbs the refrigerant evaporated in the evaporator into the solution from the low-pressure regenerator, and is designed to improve performance by creating a triple effect type by installing a compressor to compress the refrigerant vapor. .

(Function) In the dual-effect absorption refrigerator, the energy contained in the refrigerant vapor generated in the high-pressure regenerator is consumed in the low-pressure regenerator, thereby obtaining a COP that is approximately twice that of the double-effect type. The pressure and temperature of the refrigerant vapor generated in the low-pressure regenerator was so low that it was not possible to create a triple effect type, but by providing a compressor to compress the refrigerant vapor as described above, the pressure and temperature of the refrigerant vapor can be reduced to a triple effect type. By incorporating a second high-pressure regenerator that uses compressed refrigerant vapor as a heat source, a triple-effect cycle can be established.

(Embodiment) Fig. 1 shows an embodiment of the present invention, in which 1 is a first high-pressure regenerator, 2 is a compressor, 3 is a second high-pressure regenerator, 4 is a low-pressure regenerator, and 5 is a condenser. , 6 is an evaporator, 7 is an absorber, 8 is a solution pump, 9 is a low temperature solution heat exchanger, and 10 is a high temperature solution heat exchanger.

In the known double-effect absorption refrigerator, the absorption solution heated and concentrated in the first high-pressure regenerator 1 is guided to the low-pressure regenerator 4 via the high-temperature heat exchanger 10, and the refrigerant vapor generated in the first high-pressure regenerator 1 is transferred to the low-pressure regenerator 4. In this embodiment, a compressor 2 and a second high-pressure regenerator 3 are provided, and the solution from the first high-pressure regenerator 1 is guided to the second high-pressure regenerator 3. 1. The refrigerant vapor generated in the high-pressure regenerator 1 is compressed by the compressor 2, and this refrigerant vapor is guided to the second high-pressure regenerator 3 to be transferred to the first high-pressure regenerator 1.
The refrigerant vapor generated in the second high-pressure regenerator 3 is guided to the low-pressure regenerator 4, and then from the second high-pressure regenerator 3 to the low-pressure regenerator 4 via the high-temperature solution heat exchanger 10. It is configured to serve as a heat source for heating the solution.

Further, the refrigerant after heating the solution in the second high pressure regenerator 3 and the low pressure regenerator 4 is combined and introduced into the condenser 5. In addition.

The configuration other than the above is similar to that of a known dual-effect absorption refrigerator, so detailed explanation will be omitted.

In the above configuration, the refrigerant vapor generated by heating the solution in the first high-pressure regenerator 1 with an external heat source is LiBr-
For H,O-based absorption refrigerators, P=1.0ψ'crl a
b (150°C), and by compressing it in the compressor 2, the solution temperature in the first high-pressure regenerator 1 (150°C) is
The saturation pressure of the refrigerant (5kg/cILa)
b) The pressure can be increased to above, and the refrigerant that has been increased in pressure and temperature is transferred to the second
As a heating source for the high pressure regenerator 3, the solution from the first high pressure regenerator 1 is heated to generate refrigerant vapor. This refrigerant vapor (10
0° C.) is led to the low pressure regenerator 4 and heats the solution introduced from the second high pressure regenerator 3 via the high temperature bath liquid heat exchanger 10.

Furthermore, the refrigerant is separated and evaporated. On the other hand, the refrigerant that has become high-temperature water by heating the solution in the second high-pressure regenerator 3 and the low-pressure regenerator 4 and the refrigerant vapor generated in the low-pressure regenerator 4 are introduced into the condenser 5, where they exchange heat with cooling water. Condensed.

The condensed refrigerant is led to the evaporator 6 and evaporated by exchanging heat with the cold water, and this evaporated refrigerant is passed through the absorber 7 to the low pressure regenerator 4.
is absorbed by the high concentration solution introduced from the solution heat exchanger 9 through the solution heat exchanger 9.
10 and is sent to the first high pressure regenerator 1. By repeating the above cycle, a triple effect absorption refrigeration cycle is performed.

In the dual-effect type, the energy contained in the refrigerant vapor generated in the high-pressure regenerator is consumed in the low-pressure regenerator to generate refrigerant, thereby obtaining about twice the COP as in the single-effect type. If this can be made into a triple effect type, it will be about 1.5 times the current double effect type.
Although twice as much cop' could be obtained, this was impossible due to the low pressure and temperature of the refrigerant vapor generated in the LiBr-H2O-based dual-effect low-pressure regenerator.

As in this example, the refrigerant vapor generated in the first high-pressure regenerator 1 is compressed by the compressor 2, and the pressure and temperature are increased to a level that enables triple effect, thereby establishing a triple effect absorption refrigeration cycle. Can be done. In this case, whether the COP increases or not depends on the relationship between the power required to raise the pressure and temperature and the amount of steam generated thereby.

Figure 2 is a P-i diagram of a vapor compression refrigeration cycle. In Figure 1, 2→3 is the power required to raise the pressure and temperature, and 1→
Since 2 is the refrigerating heat amount of the steam obtained and the value of 1 is normally +14-1+/is<, is 4 to 6, by using such a method, the COP will definitely increase, and the current LiBr- H20 series bi-electric type COP
1.2, C0P1.6 is obtained.

(Effects) As is clear from the above, according to the present invention, a compressor is provided to compress the refrigerant vapor generated in the first high-pressure regenerator, and the compressed refrigerant vapor is used as a heating source for the second high-pressure regenerator. As a result, a triple effect cycle can be established, and COP can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a cycle diagram showing one embodiment of the present invention. FIG. 2 is a P-i diagram of a vapor compression refrigeration cycle. 1... First high pressure regenerator, 2... Compressor, 3... Second high pressure regenerator, 4... Low pressure regenerator, 5... Condenser,
6... Evaporator, 7... Absorber

Claims (1)

[Claims] a first high-pressure regenerator that heats the solution from the absorber using an external heat source; a compressor that compresses refrigerant vapor generated in the first high-pressure regenerator; and a first high-pressure regenerator that uses the refrigerant vapor compressed by the compressor as a heat source. a second high-pressure regenerator that heats the solution from the regenerator; a low-pressure regenerator that heats the solution from the second high-pressure regenerator using refrigerant vapor generated in the second high-pressure regenerator as a heat source; and the second high-pressure regenerator. and a condenser that condenses the refrigerant after heating the solution in the low pressure regenerator and the refrigerant vapor generated in the low pressure regenerator, an evaporator that evaporates the liquid refrigerant from the condenser, and the refrigerant evaporated in the evaporator as described above. An absorption refrigerator comprising an absorber that absorbs a solution from a low-pressure regenerator.