JPH0366583B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an absorption refrigerating machine, and more specifically, a generator, a condenser, an evaporator, and an absorber are connected so that refrigerant is circulated in that order. The generator and the absorber are connected so that an absorption liquid is circulated therein, and the refrigerator and the evaporator are connected, and the radiator and the absorber and the condenser are connected so that different heat transfer fluids are connected to each other. The evaporator is connected such that the evaporator is connected to This invention relates to an absorption refrigerator that prevents freezing in the refrigerator.

[Prior art]

Conventionally, in the above-mentioned absorption refrigerator, liquid phase refrigerant from the condenser is supplied to the evaporator by exchanging heat with the heat transport fluid from the refrigerator and extracting heat of vaporization from the heat transport fluid. By simply mixing the absorbing liquid and an antifreeze agent such as alcohol with the liquid, the liquid was simply supplied from the condenser to the spray nozzle in the evaporator.

[Means to be solved by the invention]

However, if an antifreeze agent is mixed with the refrigerant sprayed from the nozzle, the low boiling point components (refrigerant If the refrigerant is water and the antifreeze is an absorption liquid, the water (or, if the refrigerant is water and the antifreeze is alcohol, the alcohol) evaporates first, and as the evaporation progresses, the water in the mixed liquid phase refrigerant evaporates. As the concentration of high boiling point components gradually increases, it becomes impossible to evaporate by heat exchange with the low-temperature heat transfer fluid from the refrigerator on the downstream side of the evaporator. This resulted in a problem of a decrease in thermal efficiency, in other words, a decrease in refrigerating capacity.

An object of the present invention is to provide a synthetic and simple improvement to the refrigerant supply structure to the evaporator, and to improve the reduction in performance caused by the generation of a large amount of unevaporated mixed refrigerant.

[Means to solve the problem]

The characteristic configuration of the absorption refrigerating machine according to the present invention is that a part of the supply pipe to the nozzle that sprays the liquid phase refrigerant from the condenser in a mixed state with an antifreeze agent into the evaporator is
The evaporator is disposed below the inside of the evaporator so that heat is transferred from the refrigerant inside the evaporator to the refrigerant collected at the bottom of the evaporator, and its functions and effects are as follows.

[Effect]

In other words, when spraying the mixed refrigerant from the nozzle,
There is inherently a considerable amount of self-evaporation of the distributed refrigerant mixture, which does not return to cooling the heat-carrying fluid from the refrigerator. We focused on the situation in which a large amount of unevaporated mixed liquid accumulates in the lower part of the evaporator, which is effectively reversed, and the accumulated mixed refrigerant and the liquid phase, which is originally relatively high temperature, is supplied from the condenser to the spray nozzle. The liquid phase refrigerant supplied to the nozzle is cooled in advance by exchanging heat with the refrigerant in the middle of the supply pipe and evaporating the accumulated mixed refrigerant through the heat exchange. As a result, the mixed liquid phase refrigerant can be withdrawn from the nozzle in a low temperature state,
The amount of self-evaporation of the withdrawn mixed refrigerant can be greatly reduced, and the effective amount of evaporation evaporated by heat exchange with the heat transfer fluid from the refrigerator can be increased by an amount corresponding to the reduced amount. As a result, cooling capacity (thermal efficiency) can be improved despite the generation of a large amount of unevaporated mixed refrigerant in the lower part of the evaporator.

〔effect〕

As a result of the above, compared to re-supplying the unevaporated mixed refrigerant to the nozzle using a pump, etc., it is possible to improve the capacity reduction due to the generation of a large amount of unevaporated refrigerant with an extremely simple improvement that involves simply improving the arrangement of the supply pipe. As a result, we were able to create an absorption refrigerator that is advantageous in terms of production and economy, and also has excellent cooling performance.

〔Example〕

Next, embodiments will be described based on the drawings.

A flow path 5a is arranged so that the refrigerant is circulated through the generator 1, condenser 2, evaporator 3, and absorber 4 in that order.
5d, the generator 1 and absorber 4 are connected by an absorption liquid return flow path 5e, and the refrigerator 6 and evaporator 3, as well as the radiator 7, absorber 4, and condenser 2.
, channels 8 and 9 through which different heat transfer fluids are circulated.
are connected to form an absorption chiller that operates as follows. That is, (a) the absorption liquid from the absorber 4 is heated in the generator 1 with heat from the heating device 10 to generate refrigerant vapor from the absorption liquid, and (b) the refrigerant vapor from the generator 1 is condensed. (c) In the evaporator 3, the liquid phase refrigerant from the condenser 2 is transferred from the flow path r. The mixed refrigerant mixed with the absorption liquid as an antifreeze agent supplied to the circulation channel 5b is withdrawn from the nozzle 11 into the evaporator, and the heat of the withdrawn mixed refrigerant and the heat transfer fluid from the refrigerator 6 is removed. The heat transfer fluid is cooled as the mixed refrigerant evaporates due to exchange. That is, the load heat amount of the refrigerator 6 held by the heat transporting liquid is recovered to the refrigerant side as heat of vaporization of the withdrawn mixed refrigerant.

(d) Then, in the absorber 4, the refrigerant vapor from the evaporator 3 is absorbed into the absorption liquid cooled by the cooling heat transfer fluid from the radiator 7, and (e) the dilute absorption liquid that has absorbed the refrigerant is is circulated and supplied to the generator 1 in a preheated state by heat exchange with the concentrated absorption liquid returning to the absorber 4 in the heat exchanger 12.

In the evaporator 3, to configure the pipe structure for supplying the liquid phase refrigerant from the condenser 2 to the refrigerant withdrawal nozzle 11, a part A of the supply pipe 5b to the nozzle 11 is formed into a meandering coil shape. The refrigerant supplied to the nozzle 11 and the unevaporated mixed liquid phase refrigerant W accumulated in the lower part of the evaporator 3 exchange heat in the meandering coil-shaped portion A thereof. As a result, the refrigerant supplied to the nozzle 11 is cooled in advance as the pooled mixed refrigerant W is heated and evaporated.

In other words, the refrigerant supplied to the nozzle 11 is cooled by effectively utilizing the pool of unevaporated mixed refrigerant that causes a decrease in cooling capacity, and the liquid phase refrigerant mixed with the antifreeze agent is withdrawn at a low temperature. This suppresses self-evaporation before heat exchange with the heat transfer fluid from the refrigerator 6, and greatly improves the cooling capacity by suppressing self-evaporation, thereby reducing the amount of unevaporated mixed refrigerant in the lower part of the evaporator 3. Regardless of the occurrence, the overall cooling capacity is improved.

[Another Example] As the antifreeze agent mixed with the refrigerant, alcohol or the like can be used in addition to the absorption liquid.

The heating device 10 can be of various types, such as various burners, solar water heaters, waste heat recovery devices, and the like.

Further, various types of heat radiators 7 can be used for the radiator 7, such as a Kunlig tower or a water-water heat exchanger, and another radiator 7 may be connected to the condenser 2 and absorber 4.

Various improvements can be made to the specific heat exchange structure of the refrigerant supply pipe section A disposed below in the evaporator 3 in order to exchange heat between the pooled mixed refrigerant W and the refrigerant supplied to the nozzle 11.

The overall configuration of the refrigerator can be modified in various ways, such as making it a dual-effect type, and is not limited to the above-mentioned embodiments in terms of flow path configuration, component equipment, etc.

The object to be cooled by the refrigerator according to the present invention is not limited.

[Brief explanation of drawings]

The drawing is a system diagram showing an embodiment of the present invention. 1... Generator, 2... Condenser, 3... Evaporator,
4... Absorber, 5b... Supply pipe line, 6... Refrigerator, 7... Heat radiator, 11... Nozzle, A... Pipe line part.

Claims (1)

[Claims] 1 Generator 1, condenser 2, evaporator 3 and absorber 4
are connected in that order so that the refrigerant is circulated, the generator 1 and the absorber 4 are connected so that the absorption liquid is circulated, and the refrigerator 6, the evaporator 3, and the radiator 7 are The absorber 4 and the condenser 2 are connected such that separate heat transfer fluids are circulated, and the evaporator 3 is sprayed with refrigerant from the condenser 2 in a mixed state with an antifreeze agent. This is an absorption refrigerating machine provided with a nozzle 11, and a part A of the supply pipe line 5b to the nozzle 11 is connected to the evaporator so that heat is transferred from the refrigerant inside the refrigerant to the refrigerant accumulated at the lower part of the evaporator 3. 3
An absorption chiller is located inside and below.