JPH06201216A - Absorption / compression hybrid refrigerator - Google Patents

Abstract

(57) [Summary] [Objective] To provide an absorption-compression hybrid refrigerator in which a compression heat pump is used as a heating source of a regenerator of an absorption chiller and the energy consumption of the regenerator can be significantly reduced. In an absorption refrigerator including an evaporator, an absorber, a regenerator, and a condenser, latent heat of condensation in the condenser 14 is used as a heat source of the evaporator 11 of the compression heat pump 50.
The heat output of the compression heat pump 50 is used as the heat source of the regenerator 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption / compression hybrid refrigerator in which a compression heat pump is used as a heating source of a regenerator of an absorption chiller to reduce energy consumption of the regenerator.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, for example, there is an absorption refrigerator using an aqueous solution of lithium bromide. The operation of this absorption refrigerator is performed as follows.
That is, (a) the water w as a refrigerant is
The heat source h is supplied to the heat source h to evaporate by exchanging heat with the heat source h, whereby the heat source h is cooled.

(B) The vaporized vapor v is guided to the absorber 12 and absorbed by the concentrated liquid s of lithium bromide supplied from the pipe line 23. At this time, the absorption liquid rises in temperature due to the latent heat of steam and the absorption heat, but is cooled by the cooling water W supplied from the conduit 26 to maintain a constant temperature. (c) The dilute solution s of lithium bromide, which has absorbed vapor v and has a reduced concentration, is sent from the line 22 to the regenerator 13 by the pump 21.

(D) In the regenerator, the dilute solution of lithium bromide is heated and distilled by the heating steam S supplied from the pipe 27, only water is evaporated and concentrated (regenerated),
It is returned to the absorber 12 again via the line 23. (e) The water vapor v evaporated in the regenerator 13 is the condenser 1
4, the water is cooled by the cooling water W supplied through the pipe line 26 and condensed to become condensed water w.

(F) The condensed water w is returned to the evaporator 11 via the pipe line 24. Although the refrigerator has been described above as an example, the cooling water W is absorbed by the absorber 1
2 and the condenser 14 have risen in temperature, and can be regarded as a heat pump if attention is paid to the heating of the cooling water.

[0006]

However, in the absorption refrigerating machine, when the distilling operation is performed in order to regenerate (concentrate) the dilute solution in the regenerator, the heat given to the system by the heating steam is the distilled steam. It is transported to the condenser in the form of and released into the cooling water. In the case of a heat pump, this heat is used as a heating source in the condenser, but in the case of a refrigeration cycle, this all becomes a cooling loss, which lowers the coefficient of performance of the refrigeration cycle. Even in the case of heat pump cycle, the primary energy supplied (heat of heated steam) is simply used for heating, so the overall coefficient of performance is low.

The present invention has been made in order to overcome such a conventional problem, and an object thereof is to use a compression heat pump as a heating source of a regenerator of an absorption chiller, thereby significantly reducing energy consumption of the regenerator. It is to provide an absorption / compression hybrid refrigerator that can be reduced to

[0008]

The absorption / compression hybrid refrigerator of the present invention which can achieve the above object is an absorption refrigerator comprising an evaporator, an absorber, a regenerator, and a condenser. The present invention is characterized in that latent heat of condensation is used as a heat source of an evaporator of a compression heat pump, and heat output of the compression heat pump is used as a heat source of a regenerator.

By using the latent heat of condensation in the condenser as the heat source of the evaporator of the compression heat pump and using the heat output of the compression heat pump as the heat source of the regenerator, the energy consumption of the regenerator can be greatly reduced. .

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, according to the present invention, the heat released by the steam v as a refrigerant in the condenser 14 is used as a heat source, the temperature is raised by the compression heat pump 50, and the heat output of the compression heat pump 50 is supplied to the regenerator 13. It is designed to be used as a heat source.

That is, the steam v evaporated from the dilute lithium bromide solution s in the regenerator 13 is recovered by the heat exchange section 4 in the condenser 14 when it is cooled and condensed. Heat medium (here, description will be made on the assumption of Freon 22. Hereinafter, referred to as F22) Liquid is evaporated. That is, the heat exchange section 4 in the condenser 14 is regarded as an evaporator of the compression heat pump 50. This heat medium (F22) vapor is compressed by the compressor 1,
It is guided to the regenerator 13. In the heat exchange section 2 of the regenerator 13, the vapor of the heat medium (F22) of the compression heat pump 50 exchanges heat with the dilute solution s of the absorption heat pump 50 and is condensed.
That is, the heat exchange unit 2 corresponds to the condenser of the compression heat pump 50. Due to this heat exchange, the dilute solution of lithium bromide s is evaporated and concentrated. The concentrated lithium bromide solution s is returned to the absorber 12 through the pipe line 23. On the other hand, the liquid of F22 condensed in the heat exchanger 3 passes through the expansion valve 3 from the pipe 7 and the compression heat pump 50 in the condenser 14
Reflux to the heat exchange section 4.

Reference numerals 5, 6, and 7 are pipes of the compression heat pump 50. In addition, the evaporator 11 and the absorber 12
Since there is no change from the conventional example, the description will be omitted.

[0013]

As described above, according to the present invention, the conventional heating device used in the regenerator of the absorption refrigerator (heat pump) is unnecessary, and the external energy required for the regeneration is the compressor heat pump. Only drive power. Therefore, the coefficient of performance of the absorption refrigerator is significantly increased. For example, if the coefficient of performance of the compression heat pump is 10, the driving power of the compression heat pump can be frozen with about 1/10 of the refrigeration capacity of the absorption refrigerator. That is, the coefficient of performance of the absorption refrigerator is almost the same as that of the compression heat pump.

When the compression type heat pump is directly used as a refrigerator, the coefficient of performance thereof is regulated by the temperature difference between the cooling water temperature and the freezing temperature and is generally about 3 to 4. However, with this method, the regenerator is used. The temperature difference between the condenser and the condenser is small, so that the coefficient of performance of the compression heat pump is several times higher, and a coefficient of performance of about 10 is easily achieved as in this example.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of an absorption / compression hybrid refrigerator according to the present invention.

FIG. 2 is a conceptual diagram of a conventional absorption refrigerator.

[Explanation of symbols]

 11 Evaporator 12 Absorber 13 Regenerator 14 Condenser 50 Compression heat pump

Claims (1)

[Claims] 1. In an absorption refrigerator comprising an evaporator, an absorber, a regenerator, and a condenser, latent heat of condensation in the condenser is used as a heat source of the evaporator of the compression heat pump, and the heat output of the compression heat pump is used. An absorption / compression hybrid refrigerator characterized by being used as a heat source for a regenerator.