JPS58108368A - Double effect absorption type 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] The present invention relates to a dual effect absorption refrigerator.

In conventional dual-effect absorption refrigerators, the refrigerant liquid that is condensed in the low-temperature regenerator is sent to the condenser, so the only way to process the steam that heats the low-temperature regenerator is through an internal cycle.

Also, for example, when adding a high-pressure section to an existing single-effect absorption chiller to make it double-effect, it is necessary to connect all the steam supply lines, drain return lines, liquid supply lines, and liquid return lines. was necessary. Furthermore, it was not possible to switch to an external heat source.

The purpose of the present invention is to make it possible to switch the steam generation source between internal and external while maintaining the efficiency of the double effect, and to make it possible to install two single effect units at low cost and with high efficiency. The purpose of the present invention is to provide a heavy-effect absorption refrigerator. At the same time, another key objective is to enable existing single-effects to be driven by relatively low-temperature steam.

Although it is becoming more common to use the traditionally installed single-effect absorption system as a dual-effect low-temperature section, if the drain is returned to the conventional condenser, the solution line, etc. , modification throughout the cycle,
This was a major obstacle in design and production. According to this system, the specified purpose can be achieved by modifying only the steam system without changing any internal cycles such as the solution circulation cycle, so it is extremely easy to implement.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, the first evaporator 1. First absorber2. First regenerator 3. Condenser 4. Pump 5. The heat exchanger 6 constitutes a typical type 1 dynamic absorption refrigeration cycle. That is, the refrigerant vapor that is evaporated by removing heat from the cold water 7 flowing in the pipe in the first evaporator reaches the first absorber 2 and is absorbed into the solution, thereby becoming a dilute solution. This is sent to the first regenerator 3 by the pump 5, heated and concentrated by the steam in the pipe, and returned to the first absorber 2 again. The vapor generated during this concentration is liquefied in the condenser 4 and returned to the first evaporator 1. Refrigerant is supplied by refrigerant pump 8
It is sprayed onto the evaporator tube bank to promote heat transfer.

First absorber2. In the condenser 4, cooling water 9 flowing through the tube cools the solution (removes absorbed heat) and condenses the refrigerant gas.

Here, to explain the function of the newly added part, the refrigerant gas that is evaporated by taking heat from the cold water 7 flowing inside the pipe in the second evaporator 10 reaches the second absorber 11, where it is dissolved. It is absorbed into a dilute solution. This dilute solution is sent to the second regenerator 12 by the pump 13, heated and concentrated by the heat source 16 flowing inside the tube, and the concentrated solution is returned to the second absorber 11. On the other hand, the vapor generated during the concentration process is
It is used as a heating source for the regenerator 3, and the 0 blue becomes a drain and returns to the second evaporator 10. The refrigerant in the second evaporator 10 is
The refrigerant pump 15 sprays the refrigerant onto the tube group of the second evaporator 10 .

Heat exchanger6. The heat exchanger 14 serves to improve cycle efficiency by mutually exchanging heat between the dilute solution and the concentrated solution.

Now, with this configuration, the heating of the first regenerator is performed exclusively by the steam generated in the second regenerator, so this cycle is performed only by the heat source supplied to the second regenerator from the outside. In fact, the whole thing is a double-effect cycle in operation.

Furthermore, in a normal dual-effect cycle, the drain of the refrigerant vapor used to heat the solution in the first regenerator directly reaches the condenser, so the internal cycle cannot be separated.

However, as in this method, by returning the steam supplied to the first regenerator to the second evaporator, it is possible to modify the machine originally used for model operation and to make a second one. When used for heavy effects, etc., without destroying the vacuum on the speech and action side and without causing any changes to the internal cycle,
It has the advantage that it can be used as a dual-effect low-pressure side without any modifications to the pump heat exchanger. At this time, when flowing cold water or cooling water, the inlet side, that is, the higher temperature side, is the first evaporator side for the cold water, and the first evaporator side is the inlet side, that is, the higher temperature side for the cooling water. By flowing the steam in series as the first absorber side, even if the pressure and temperature of the steam supplied to the first regenerator, which is a heating source, are low as a simple single effect, cold water, Both cooling water has the advantage of lowering the cycle temperature and concentration, so it has the advantage of being able to be used as a very well-balanced refrigeration system with dual effects.

Furthermore, even if for some reason the steam pressure or temperature generated in the second regenerator drops or becomes completely unavailable, the system is independent, so alternative steam can be transferred to the first regenerator. If a switching passage is provided by switching a valve or the like so that only the oil is fed, an additional effect such as the original single effect can be used as is will be produced.

[Brief explanation of the drawing]

The figure is a cycle flowchart showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... First evaporator, 2... First absorber, 3... First regenerator, 4... Condenser, 5... Pump, 6...
Heat exchanger, 7...Cold water, 8-...Refrigerant pump, 9mm
m cooling water, 10... second evaporator, 11-... second absorber, 12... second regenerator, 13... pump, 14-
...Heat exchanger, 15... Refrigerant pump, 16... Heat source. Agent Patent Attorney Toshiyuki Usuda 11, 2'・ [-71 ノ.

Claims (1)

[Claims] 1. In an absorption refrigeration system consisting of a first evaporator, a first absorber, a first regenerator, a condenser pump, a heat exchanger, and piping connecting these, each of the above-mentioned devices is Separately, a heating, absorption, and evaporation unit consisting of a second evaporator, a second absorber, a second regenerator pump, a heat exchanger, and piping connecting these is additionally installed, and the heat source is connected to the second regenerator. The steam generated at this time is sent to the first regenerator, the first regenerator heats the solution, and the condensate that liquefies and condenses itself is returned to the second evaporator. A dual-effect absorption refrigerator characterized in that two suction refrigeration cycles operate in parallel using one heating source. 2. Chilled water is supplied to the first evaporator and exits through the second evaporator, and the cooling water flows in the order of the first absorber, the condenser, and the second absorber. A dual-effect absorption refrigerator according to claim 1.