JPS5825948B2 - Double effect absorption chiller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dual-effect absorption refrigerator, and aims to increase thermal efficiency and improve the coefficient of performance.

In an absorption refrigerator, the refrigerant used for cooling is absorbed by an absorption liquid, and the absorption liquid and refrigerant are separated by heating.
Therefore, theoretically, the lower the temperature of the concentrated absorption liquid flowing into the absorber, the higher the temperature of the dilute absorption liquid flowing into the generator.

For example, the diagram shown in Figure 1 is a Dueling diagram of the absorption liquid (lithium bromide solution) circulating in a dual-effect absorption refrigerator, where C is the inlet of the low-temperature heat exchanger for the dilute liquid, and d is the inlet of the dilute liquid low-temperature heat exchanger. The outlet of the low-temperature heat exchanger and the inlet of the high-temperature heat exchanger, e is the outlet of the high-temperature heat exchanger for dilute liquid, g is the inlet of high-temperature heat exchanger for intermediate liquid, h is the same exit, and i is the low-temperature of concentrated liquid. heat exchanger inlet, k
similarly indicates the outlet, and the value on the horizontal axis corresponding to each point (indicated by the suffix t) represents the liquid temperature at that point.

However, such points e and h on the Dueling line
, are all theoretical points, and under actual machine operating conditions, the high temperature heat exchanger outlet temperature of the dilute liquid is e.
The high temperature heat exchanger outlet temperature of the dark intermediate liquid is h' The low temperature heat exchanger outlet temperature of the concentrated liquid is the value shown at point 1, and both the dilute absorption liquid and the intermediate liquid are in the generator 1, Flowing into 2,
Steady temperature eI, h1 of refrigerant generation only after heating
This temperature increase e1 e'1 and h/
, the amount of heating heat for h/1 had to be replenished as heat loss.

The present invention has been made in view of this point, and aims to reduce the amount of heating in the generators 1 and 2, increase thermal efficiency, and improve the coefficient of performance by minimizing heat loss to the outside of the absorption refrigerator system. It is.

An embodiment of the present invention shown in FIG. 2 will be described below.

1 is a high temperature generator that heats the dilute absorption liquid to separate the refrigerant and sends out an intermediate liquid; 2 is a high temperature generator that uses the gaseous refrigerant flowing from the high temperature generator 1 to the condenser 3 to absorb the intermediate liquid as a refrigerant and concentrate 4 is an evaporator that obtains cold water by using the liquid refrigerant flowing from the condenser 3; 5 is an absorber; the dilute absorption liquid that has absorbed the refrigerant in the absorber is It is returned to the high temperature generator 1 by the pump 6.

Therefore, in the present invention, in the absorption liquid circulation path of such an absorption refrigerator, the concentrated absorption liquid is connected to the absorber side of the replacement liquid pipe line 7 that returns the diluted absorption liquid from the absorber 5 to the high temperature generator 1. A low-temperature heat exchanger 8 that exchanges heat with the liquid, and a high-temperature heat exchanger 9 that exchanges heat with the intermediate liquid are also provided on the high-temperature generator side, and these two heat exchangers 8 and 9 and the low-temperature generator 2 A medium temperature heat exchanger 10 for exchanging heat between the intermediate liquid and the concentrated liquid is disposed between the intermediate liquid and the concentrated liquid.

According to the absorption refrigerator having such a configuration, the high temperature heat exchanger 9
When the temperature e' of the dilute absorption liquid is brought closer to point e1 by increasing the heat exchange efficiency of Since the concentrated absorption liquid that comes out raises the lowered intermediate liquid temperature (returns from h/1 to h in the figure), the proportion of heating heat used to raise the temperature of the absorption liquid in low-temperature generator 2 also decreases. However, it is possible to efficiently generate refrigerant in the circle generators 1 and 2.

Furthermore, when the temperature of the concentrated absorption liquid flowing into the low temperature heat exchanger 8 is lowered using the medium temperature heat exchanger 10, the water vapor partial pressure of the concentrated absorption liquid flowing into the absorber 5 can also be lowered, and the Since heat loss can also be reduced, the thermal efficiency of the absorption refrigerator can be increased and the coefficient of performance can be improved.

[Brief explanation of drawings]

FIG. 1 is a Duehring diagram of an absorption liquid for explaining the present invention, and FIG. 2 is a dual-effect absorption refrigerator showing an embodiment of the present invention. 1... High temperature generator, 2... Low temperature generator, 3... Condenser, 5... Absorber, 8...
...Low temperature heat exchanger, 9...High temperature heat exchanger, 10...Medium temperature heat exchanger.

Claims (1)

[Claims] 1 Using the gaseous refrigerant flowing from the high-temperature generator to the condenser, the intermediate liquid flowing from the high-temperature generator to the absorber is reheated and separated into refrigerant and concentrated absorption liquid, and the refrigerant is transferred to the evaporator and concentrated absorption liquid A replenishment fluid pipe is formed to send the refrigerant to the absorber, and a pipe to return the diluted absorption liquid that has absorbed refrigerant in the absorber to the high-temperature generator again, as well as to return the diluted absorption liquid from the absorber to the high-temperature generator. A low-temperature heat exchanger is installed on the absorber side to exchange heat with the concentrated absorption liquid, and a high-temperature heat exchanger is installed on the high-temperature generator side to exchange heat with the intermediate liquid. It is characterized by being equipped with a medium temperature heat exchanger that exchanges heat between the concentrated absorption liquid on the way from the low temperature generator for reheat separation to the low temperature heat exchanger and the intermediate liquid on the way from the high temperature heat exchanger to the low temperature generator. A dual-effect absorption refrigerator.