JPH0411778B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a solar heat absorption cooling device using an absorption refrigerator using solar heat as a driving heat source.

(b) Conventional technology This type of conventional device stores solar heat collected by a solar heat collector during the day, as disclosed in Japanese Patent Publication No. 58-26507 and Japanese Patent Application Laid-Open No. 56-64257. Heat was stored in a tank, and the hot liquid in the heat storage tank was supplied to an absorption chiller to generate cold water, and this cold water was used to perform air conditioning.

(c) Problems to be solved by the invention However, since the above-mentioned conventional equipment uses a water-cooling system for the condenser and absorber of the absorption chiller, these heat exchangers are difficult to use in areas with poor water quality conditions. I was worried about it getting spoiled. Of course, JP-A-58-
This problem can be solved by changing the absorption chiller to an air-cooled type as disclosed in Publication No. 110965, but since the outside temperature is high during the day when solar heat can be utilized, absorption chiller There was a problem that the coefficient decreased and the operating efficiency decreased.

(d) Means and operation for solving the problems The present invention has been made to solve the above-mentioned problems, and is an absorption type refrigeration system using solar heat as a driving heat source even in areas where the quality of cooling water is poor. The purpose is to provide a solar heat absorption cooling system that can operate the machine efficiently for a long period of time.The cooling system stores heat in a heat storage tank using a solar heat collector during the day and releases it at night when the outside temperature has dropped. The absorption chiller is operated to cool the air by circulating brine between the cold storage tank and the cooling load during the daytime of the next day, while also storing heat between the solar heat collector and the heat storage tank. This is what I did.

(e) Examples Examples of the solar heat absorption cooling device according to the present invention will be described below with reference to the drawings.

The solar heat collection circuit 1 includes a solar heat collector 2 and a heat storage tank 3
The first circulation pump 4 is configured to circulate a heat medium between the two.

The absorption refrigerator 5 has a generator 6, an evaporator 7, a condenser 8, an absorber 9, and a solution heat exchanger 10. The condenser 8 and absorber 9 are air-cooled, and the refrigerant is 2 -2-2 trifluoroethanol (hereinafter
N-methyl-2-pyrrolidone (hereinafter referred to as NMP) is used as an absorbent. The reason for using TFE and NMP is that, for example, in a water-lithium bromide system, water is 0.
It is impossible to obtain a low temperature below 0°C because the solidification occurs at ℃, but in the TFE-NMP system, the freezing point is
This is because the temperature is as low as -45℃ for NMP and -25℃ for NMP.

The hot liquid circulation circuit 11 includes a heat storage tank 3 and an absorption refrigerator 5.
The second circulation pump 12 is configured to circulate hot liquid between the generator 6 and the generator 6 .

The cold storage tank 13 stores a cold storage agent. The type of cold storage agent may be water, and if the freezing point is to be lowered, a cold storage agent whose melting point has been adjusted by adding propylene glycol, sodium chloride, potassium carbonate, etc. to water may be used, for example.

The cold liquid circulation circuit 14 is connected to the evaporator 7 of the absorption refrigerator 5.
A third circulation pump 15 is configured to circulate cold liquid between the cold storage tank 13 and the cold storage tank 13 .

The cooling load 16 is arranged at a predetermined position.

The brine circulation circuit 17 is configured to circulate brine between the cold storage tank 13 and the cooling load 16 using a fourth circulation pump 18 .

Next, the operation of the absorption cooling device according to the present invention will be explained.

When the first circulation pump 4 is operated during the day, solar heat collected by the solar heat collector 2 is stored in the heat storage tank 3. When the second circulation pump 12 and the third circulation pump 15 are operated at night, the hot liquid in the heat storage tank 3 is supplied to the generator 6 of the absorption chiller 5, and this hot liquid is used as the driving energy source for the absorption chiller. The refrigerator operates, and the cold liquid generated in the evaporator 7 is supplied to the cold storage tank 13, where the cold storage agent is stored. Regarding the operation of the absorption refrigerator, refrigerant vapor evaporated in a generator 6 is liquefied in a condenser 8 and sent to an evaporator 7, and the evaporated refrigerant is absorbed in an absorber 9. . The solution heat exchanger 10 exchanges heat between the concentrated liquid (solution containing a lot of TFE) pumped from the absorber 9 to the generator 6 and the dilute liquid (solution containing little TFE) flowing out from the generator 6 to the absorber 9. It is for the purpose of When the fourth circulation pump 18 is operated, the brine is cooled in the cold storage tank 13 and sent to the cooling load 16 for use in cooling.

TFE as refrigerant and absorbent in absorption chiller 5
- When NMP is used, preferably a rectifier and a demultiplexer are provided between the generator 6 and the condenser 8;
The evaporated refrigerant is passed through a rectifier and a demultiplexer to increase the refrigerant concentration, and the vapor is liquefied in a condenser 8. In areas with poor water conditions, that is, areas where it is difficult to use cooling towers or cooling water, the decentralizer, condenser, and absorber must be air-cooled, and when using TFE-NMP, they can be air-cooled. Although daytime operation is also possible, the efficiency of absorption chillers is low, so nighttime operation is preferable. To achieve this, a system is needed that stores solar heat during the day, operates an absorption chiller at night to store the cold, and performs daytime cooling the next day.

(f) Effects of the Invention The solar heat absorption cooling system according to the present invention employs an air-cooled type for the condenser and absorber of the absorption chiller, so it can be used even in areas with poor cooling water quality conditions. It is now possible to operate the refrigerator efficiently over a long period of time, and since TFE is used as a refrigerant and NMP is used as an absorbent, the refrigerant can be prevented from freezing in the low-temperature, low-pressure evaporator.
It is now possible to store cold in the cold storage agent in the cold storage tank at a temperature below 0°C and take it out at a low temperature below 0°C.Also, the absorption chiller is operated at night when the outside temperature is low and the cold is stored in the cold storage tank. The refrigerator can be operated with high efficiency and can be a system suitable for regions such as the Middle East where the outside temperature is high during the day and low at night.

[Brief explanation of drawings]

The drawing is a diagrammatic illustration of a solar heat absorption cooling device according to the present invention. 1...Solar heat collector circuit, 2...Solar heat collector, 3...
Heat storage tank, 4... First circulation pump, 5... Absorption refrigerator, 6... Generator, 7... Evaporator, 8... Condenser, 9...
Absorber, 10... Solution heat exchanger, 11... Hot liquid circulation circuit, 12... Second circulation pump, 13... Cold storage tank, 1
4...Cold liquid circulation circuit, 15...Third circulation pump, 1
6...Cooling load, 17...Brine circulation circuit, 18...
Fourth circulation pump.

Claims (1)

[Scope of Claims] 1. A solar heat collection circuit that circulates a heat medium between a solar heat collector and a heat storage tank by a first circulation pump operated during the day, a generator, an evaporator, and an air-cooled type. an absorption refrigerator, which has a condenser and an absorber, and uses 2-2-2 trifluoroethanol as a refrigerant and N-methyl-2-pyrrolidone as an absorbent, the heat storage tank and the absorption refrigerator. a hot liquid circulation circuit that circulates hot liquid by a second circulation pump operated at night between the generator and the generator; a cold storage tank containing a cold storage agent; an evaporator of the absorption chiller and the above. a cold liquid circulation circuit that circulates cold liquid between the cold storage tank and the cooling load by a third circulation pump operated at night; a cooling load; and a fourth circulation pump between the cold storage tank and the cooling load. 1. A solar heat absorption cooling device comprising: a brine circulation circuit that circulates brine through a brine circulation circuit.