JPH02192551A - Absorptive type freezer with double effects - 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 <Industrial Application Field> The present invention relates to an improvement in a dual-effect absorption refrigerator.

<Prior Art> As a conventional technique for a double-effect absorption refrigerator, for example, Japanese Patent Publication No. 32384/1984 is known. In this absorption refrigerator, the concentrated solution from the high-temperature regenerator exits the high-temperature heat exchanger, mixes it with the intermediate concentrated solution from the low-temperature regenerator, and guides it to the low-temperature heat exchanger. The system adopts a configuration in which the heat is exchanged and then distributed to the absorber.

<Problems to be solved by the invention> However, in conventional dual-effect absorption refrigerators of this type, the temperature of the concentrated solution exiting the high-temperature heat exchanger is higher than the saturation temperature of the pressure inside the low-temperature regenerator. There was a problem in that the refrigerant vapor generated by flashing of the concentrated solution exiting the high temperature heat exchanger was absorbed by the solution in the low temperature regenerator, making it impossible to achieve the original performance of the low temperature regenerated image.

In view of the above-mentioned circumstances, the present invention prevents flashing of the concentrated solution exiting the high-temperature heat exchanger, exhibits the original performance of the low-temperature regenerated image, and smoothes the flow of the intermediate concentrated solution from the low-temperature regenerator. The purpose is to provide a dual-effect absorption refrigerator.

<Means for Solving the Problems> The present invention provides a parallel flow absorption refrigerator in which a third heat exchanger is disposed between a high temperature heat exchanger and a low temperature heat exchanger, and a dilute solution is transferred to the third heat exchanger. After exiting the heat exchanger, the concentrated solution is divided into a low-temperature regenerator and a high-temperature regenerator, and the concentrated solution from the high-temperature regenerator is
After exiting the heat exchanger, it is mixed with the intermediate concentrated solution from the low-temperature regenerator, passed through the low-temperature heat exchanger, and distributed over the heat exchanger tubes of the absorber.

<Function> Due to the above configuration, the concentrated solution coming out of the high temperature regenerator is cooled to below the saturation temperature of the internal pressure of the low temperature regenerator in order to pass from the high temperature heat exchanger to the third heat exchanger. Because
Even if it is mixed with the intermediate concentrated solution from the low temperature regenerator at the place where it exits the third heat exchanger, it does not flash, and the low temperature regenerator exhibits its original performance, and the intermediate concentrated solution from the low temperature regenerator is also mixed. Can be mixed smoothly into concentrated solutions.

<Example> The present invention will be described below based on the drawings of the example.

1 and 2 are a schematic diagram and an explanatory diagram showing the essential parts of a parallel flow type double-effect absorption refrigerator, and 1 is a high-temperature heat exchanger connected to a high-temperature regenerator 15 equipped with a burner 14. A third heat exchanger 2 is disposed between the high temperature heat exchanger 1 and the low temperature heat exchanger 3, and the dilute solution flowing from the low temperature heat exchanger 3 side is transferred to the output of the third heat exchanger 2. low temperature regenerator 10
side and high temperature heat exchanger 1. The pipe line is branched so that it flows to the high temperature regenerator 15 side, and the concentrated solution from the high temperature regenerator 15 flows out from the regenerator 10 to the place where it flows out from the high temperature heat exchanger 1 via the third heat exchanger 2. The mixed concentrated solution is transferred to an air-cooled absorber 5 via a low-temperature heat exchanger 3 to a downflow tube 7 with fins 6, which serves as an upright heat transfer tube. The diluted solution is sprayed at the evaporator 8 located at the upper end, and the dilute solution accumulated in the absorber 5 is sent to the absorption liquid pump 4.
3. Have a low temperature heat exchanger. It is returned to the third heat exchanger 2 side.

13 is a condenser, which has a downflow pipe 1 with fins 11 standing up at the top.
The low-temperature regenerator 10 is disposed at the upper end of 2. Reference numeral 9 denotes a fan disposed above the middle of the downstream pipes 7.12 which stand up on both sides, and is configured to flow cold air from outside of the downstream pipes 7.12.

Next, to explain this effect, in the operation of such a double effect absorption refrigerator, the concentrated solution produced by the generation of refrigerant vapor in the high temperature regenerator 15 heated by the burner 14 is heated by the high temperature regenerator 15. Since the hot heat exchanger 1° is cooled to below the saturation temperature of the internal pressure in the low temperature regenerator 10 in the third heat exchanger 2, the intermediate concentration from the low temperature regenerator 10 is cooled at the position where it exits the third heat exchanger 2. To obtain a predetermined refrigeration cycle that does not cause rough flush even when a solution is introduced and mixed. Therefore, the original performance of the high-temperature regenerator 15 can be exhibited, and the intermediate concentrated solution from the low-temperature regenerator 10 can also be smoothly mixed into the concentrated solution.

<Effects of the Invention> As described above, the dual-effect absorption refrigerator of the present invention has a third exchanger disposed between the high-temperature heat exchanger and the low-temperature heat exchanger, and the dilute solution is transferred to the third heat exchanger. The concentrated solution from the high temperature regenerator is mixed with the intermediate concentrated solution at the position where it passes through the third heat exchanger, so there is no flashing at this mixing position. The low-temperature regenerator exhibits its original performance, and the intermediate concentrated solution from the low-temperature regenerator can be mixed smoothly with the concentrated solution. Therefore, even if there is a slight change in the performance of the high-temperature heat exchanger, stable refrigeration operation can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of use of the present invention, and FIG. 2 is an explanatory diagram of the main parts thereof. 1... High temperature heat exchanger, 2... Third heat exchanger, 3...
- Low temperature heat exchanger, 4... Absorption liquid pump, 5... Absorber, 8... Evaporator, 9... Fan, 10... Low temperature regenerator, 13... Condenser, 14・・・Burna, 15・
...High temperature regenerator. Figure 9F → 1 inch

Claims (1)

[Claims] 1. In a parallel flow absorption refrigerating machine, a third heat exchanger is installed between the high temperature heat exchanger and the low temperature heat exchanger, and after the dilute solution exits the third heat exchanger, it is transferred to the low temperature regenerator. The concentrated solution from the high-temperature regenerator is mixed with the intermediate concentrated solution from the low-temperature regenerator after exiting the third heat exchanger, and passes through the low-temperature heat exchanger to the heat transfer tube group of the absorber. A dual-effect absorption chiller characterized by dispersion on top.