JPS58120063A - 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 an absorption refrigerating machine, and its purpose is to increase the utilization efficiency of heat provided from an external heat source, and to increase the level of cold heat provided for cooling from freezing B to cooling. The idea is to make it two-tiered so it can be used for multiple purposes.

Generally, an absorption refrigerating machine includes a generator, a condenser, an evaporator, and an absorber.A generator evaporates and separates a refrigerant from a mixed solution of a refrigerant and an absorbent by heating, and the refrigerant vapor is liquefied in a condenser. .

Next, the refrigerant is evaporated again in the evaporator, and the latent heat of vaporization at this time performs freezing directly or via a heat medium,
Furthermore, there is a path in which the evaporated refrigerant is absorbed into a concentrated solution rich in absorbent in an absorber. The dilute solution obtained in this absorber, which has sufficiently absorbed the refrigerant vapor, is again sent to the generator to evaporate the refrigerant, while the concentrated solution obtained in this generator is conveyed to the absorber, and the cycle is continued continuously. works.

By the way, as mentioned above, the generator evaporates the refrigerant from a dilute solution (refrigerant-rich solution) using heat provided from an external heat source, and the following three types of generators have been conventionally used in terms of construction. i.e. the first heated by an external heat source.
A so-called single-effect cycle, in which the generator is connected directly to the condenser, and a series-connected double-effect cycle, in which the heat of condensation of the refrigerant vapor emanating from this first generator is used to operate a second generator, and the same refrigerant. - There are three types in which the above single-effect cycles of the absorbent system are connected in parallel and the heat of condensation of the first cycle is used as the heat source of the second cycle. but.

Other than this, the parts remain the same, the condenser and evaporator.

There is no major difference in the structure and function of the absorber, etc., and in any case, the refrigerant is a single component, and only one type of refrigerant is used. Therefore, only one type of cooling temperature can be obtained for single effect, double effect, or parallel single effect, and it has been impossible to obtain separate cooling temperatures depending on the purpose.

In view of the above-mentioned conventional example, the present invention connects in parallel at least two cycles using different refrigerants that are operated independently by one heat source.One embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 11 is a first generator, 12 is a first condenser, 13 is a first evaporator, 14 is a first absorber, 15 is a first heat exchanger, and 16 is a first indoor unit.

It constitutes the first cycle. On the other hand, 21 is a second generator,
22 is a second condenser, 23 is a second evaporator, 24 is a second absorber, 26 is a second heat exchanger, and 26 is a second indoor unit, which constitute a second cycle.

Further, 31 is a heater, and 32 is a cooling water tower. Further, in the figure, P indicates a pump, and arrows indicate the flow direction of liquid and steam, respectively. Here, the solid line represents the flow of the first cycle, the dashed line represents the flow of the second cycle, and the broken line represents the flow of cooling water.

Here, in the first cycle, water is used as a refrigerant, and lithium bromide (L
The second cycle uses a solution using methanol (CiH30H) as a refrigerant and lithium bromide as an absorbent.

The operation of the above configuration will be explained in detail. First, in the first cycle, a dilute solution (water-rich lithium bromide aqueous solution; concentration of about 68% by weight) is supplied from the first heat exchanger 16 to the first generator 11.
flows in and is heated to approximately 146°C by the heater 31. The water evaporates and flows into the first condenser 12 while a concentrated concentrated solution (aqueous solution rich in lithium bromide; concentration of about 63
% by weight) is returned to the first heat exchanger 16. First condenser 12
The water vapor that flows into the tank radiates heat here and liquefies at about 90'C.

It flows into the first evaporator 13, removes latent heat of vaporization, evaporates at about 6°C, and flows to the first absorber 14. In the first evaporator 13, a heat medium cooled to about 7°C is obtained.

This is sent to the first indoor radiator 16 for cooling. The water vapor that has flowed into the first absorber 14 is absorbed by the concentrated solution flowing down from the first heat exchanger 16, becomes a dilute solution, and is then reused in the first absorber 14.
It is returned to the heat exchanger 15.

The first absorber 14 is cooled to approximately 42°C by the cooling water cooled by the cooling water tower 32. On the other hand, the second cycle operates in the same manner as the first cycle, but here the refrigerant is methanol. can be.

Therefore, conditions such as temperature and concentration are different. That is, the second
The generator 21 is at about 90'C, the concentrated solution is about 58% by weight, the dilute solution is about 63% by weight, and the second absorber 24 is at about 46°C.
C9 second condenser 22 reaches approximately 48°C.

Each is cooled by cooling water. Therefore, the heat medium is cooled down to about -3°C in the second evaporator 23, and about 10°C in the second indoor radiator 26 compared to the first indoor radiator 16.
A lower temperature can be obtained. Moreover, the temperature of the second indoor radiator 26 is such that it can be used for freezing.

One heat source can be used in two ways.

Also, looking at the efficiency of heat utilization, under the above conditions, the COP in the first cycle is approximately Q, 61, and in the second cycle COP
The OP becomes about 0.67, the total COP becomes about 1.06, and the heat utilization efficiency is also improved.

Note that the absorbent-refrigerant system can be changed depending on the required temperature conditions, and is not limited to lithium bromide-water and lithium bromide-methanol as described above, but it can be used in this system. This provides the effect of cooling and freezing at the same time.

As described above, the absorption refrigerating machine of the present invention uses two absorption refrigerating cycles, and the condensation heat of one absorption refrigerating cycle is used in conjunction with the generated heat of the other cycle.

Since different refrigerants are used in both cycles, two types of low temperatures can be obtained, and this has an excellent effect of being able to perform cooling and freezing at the same time, for example.

[Brief explanation of the drawing]

The figure is a circuit diagram of an embodiment of an absorption refrigerator according to the present invention. 11...First generator, 12...First condenser. 13...First evaporator, 14...First absorber, 15...First heat exchanger, 16...
・First indoor unit, 21...Second generator, 22...
...Second condenser, 23...Second evaporator, 24
...Second absorber, 26...Second heat exchanger, 26...Second indoor unit, 31...Heater, 32...・Cold water tower.

Claims (3)

[Claims] (1) A first absorption refrigeration cycle that is operated using an external heat source, and a second absorption refrigeration cycle that is operated by the heat of condensation generated in the condenser of the first cycle and that uses at least a different refrigerant.
An absorption chiller equipped with an absorption refrigeration cycle on the panel side. (2) The absorption refrigerator according to claim 1, wherein the temperature of the refrigerant obtained in the evaporator of the second absorption refrigeration cycle is lower than that of the refrigerant in the evaporator of the first absorption refrigeration cycle. (3) The refrigerant of the first absorption refrigeration cycle is water (H2O
), and the refrigerant in the second absorption refrigeration cycle is methanol (
C1bOH) according to claim 1 or 2.