JPH02192554A - Air-cooled absorptive type refrigerator - Google Patents

Abstract

PURPOSE:To prevent a flash of a concentrated liquid in an absorber to sufficiently absorb refrigerant vapor from an evaporator by the use of absorption liquid in the absorber by providing at least two heat exchangers cooling the concentrated liquid from a low temperature heat exchanger by the use of cooling air at the upper and lower positions of a flowing-down pipe part of the absorber to perform efficient cooling by using multistage air. CONSTITUTION:A concentrated liquid produced in a high temperature generator 15 heated by a burner 10 is sprayed by a low temperature generator 7 through a high temperature heat exchanger 11, an intermediate concentrated liquid accumulated in the low temperature generator 7 passes a low temperature heat exchanger 12, at first, is introduced in the upper part of a heat exchanger 14 at the lower position of a flowing-down pipe 4 of an absorber 1, cooled by cooling air of the outlet side of the flowing-down pipe 4, and the concentrated liquid which becomes the most downstream allowed to flow out from the heat exchanger 14 is introduced from the lower end of the generator 15 of the upper position of the flowing-down pipe 4 to the upper end thereof to cool at the inlet side of the flowing-down pipe 4.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to improvements in air-cooled absorption refrigerators.

<Prior Art> As a technology of a conventional air-cooled absorption refrigerator, for example, Japanese Patent Laid-Open No. 58-208559 is known. In this case, the absorption chiller recirculates the concentrated liquid directly from the low-temperature heat exchanger, or partially recirculates the dilute acid sent from the absorber to the high-temperature regenerator, mixes it with the concentrated liquid, and supplies it to the absorber. It is configured to be dispersed.

<Problem to be solved by the invention> However, in conventional air-cooled absorption refrigerators of this type, the temperature of the concentrated liquid leaving the low-temperature heat exchanger is higher than the saturation temperature of the pressure inside the absorber. When sprayed on the absorber, it becomes a flash. For this reason, there is a problem in that a vertical falling film type absorber having a limited length cannot sufficiently absorb refrigerant vapor from the evaporator.

In view of the above-mentioned circumstances, the present invention is an air-cooled absorption refrigerator that prevents the flash of concentrated liquid in the absorber and allows the absorbent liquid in the absorber to sufficiently absorb refrigerant vapor from the evaporator. The purpose is to provide the following.

Means for Solving the Problems> The present invention provides a parallel flow air-cooled absorption refrigerating machine, in which the pain fluid flowing out from the outlet of a low-temperature heat exchanger is cooled by cooling air at a downstream pipe position of the absorber. At least two exchangers are provided, and the heat exchanger on the upstream side of the concentrated liquid is cooled with the cooling air on the outlet side of the downstream pipe, and the heat exchanger on the most downstream side is cooled with the cooling air on the inlet side of the downstream pipe. The concentrated liquid is cooled sufficiently and then sprayed using an absorber.

Due to the above configuration, the concentrated liquid that exits the high-temperature regenerator is first cooled by cooling air flowing through the outlet side (lower part of the downstream pipe).
Cooling air from the inlet side (at the top of the downflow tube) is passed through the heat exchanger that is the most downstream side for cooling. For this reason, the concentrated liquid is cooled to below the saturation temperature of the pressure inside the absorber, so it does not flash in the absorber and is easily and evenly distributed over the heat exchanger tubes. Furthermore, since the refrigerant vapor passage within the absorber is filled with only the refrigerant vapor generated in the evaporator, the absorber exhibits its original performance.

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

The drawing shows a parallel flow air-cooled absorption refrigerator, in which 1 is an absorber in which a downflow pipe 4 with fins 3 is arranged vertically at the top, an evaporator 2 is provided at the upper end of the absorber 1, and an evaporator 2 is provided at the upper end of the absorber 1. The transferred liquid accumulated in the absorber 1 is guided from the low-temperature heat exchanger 12 to the high-temperature heat exchanger 11 via the absorption liquid pump 13 to the high-temperature regenerator 9 equipped with a burner 10, and the concentrated liquid generated in the high-temperature regenerator 9 is The liquid is led to a low temperature regenerator 3, and a flow pipe 6 with fins 3 disposed above the condenser 5 is provided at the lower part of the low temperature regenerator 7, and a flow pipe 6 with fins 3 disposed above the condenser 5 is provided at the lower part of the low temperature regenerator 7, and a flow pipe 6 with fins 3 disposed above the condenser 5 is provided at the lower part of the low temperature regenerator 7. A fan 8 is installed at the upper end of one heat exchanger 14 provided at the lower part of the outlet side of the downstream pipe 4 of the absorber 1, and the upstream side of the concentrated liquid flowing through the low-temperature heat exchanger 12 is installed at The most downstream concentrated liquid flowing out from the lower end of the heat exchanger 14 is guided from the lower end of the second heat exchanger 15 provided at the upper part of the downflow pipe 4 on the artificial side. The structure is such that the concentrated liquid flows out from the upper end and is guided to the dispersion section at the upper end of the absorber 1 and is sprayed.

Next, to explain this effect, when operating such an air-cooled absorption refrigerator, the concentrated liquid generated in the high temperature regenerator 15 heated by the burner 10 is transferred to a low temperature via the high temperature heat exchanger 11. The intermediate concentrated liquid dispersed in the regenerator 7 and accumulated in the low-temperature regenerator 7 is passed through the low-temperature heat exchanger 12, and this concentrated liquid is first transferred to the heat exchanger located at the lower part of the downflow pipe 4 of the absorber 1. 14 and cooled by cooling air on the outlet side of the downstream pipe 4,
The most downstream concentrated liquid flowing out of the heat exchanger 14 is guided from the lower end to the upper end of the heat exchanger 15 at the upper position of the downflow pipe 4, and is cooled at the inlet side of the downflow pipe 4, resulting in multi-stage efficiency as a whole. Air-cooled. That is, since the concentrated liquid is reliably cooled to below the saturation temperature of the pressure inside the absorber, it is easily and evenly spread over the heat exchanger tubes without flashing even when it is spread at the upper part of the absorber 1. Moreover, since the refrigerant vapor passage in the absorber 1 is filled with only the refrigerant vapor generated in the evaporator 2, the absorber can exhibit its original performance.

<Effects of the Invention> As described above, the air-cooled absorption refrigerator of the present invention includes at least two heat exchangers for cooling the concentrated liquid from the low-temperature heat exchanger with cooling air at the upper and lower positions of the downstream pipe portion of the absorber. Because the system is equipped with a multi-stage cooling air system for efficient cooling, it is possible to reliably cool the concentrated liquid to below the saturation temperature of the pressure inside the absorber. A falling film absorber can also sufficiently absorb refrigerant vapor from the evaporator.

That is, since the refrigerant vapor passage within the absorber is filled with only the refrigerant vapor generated in the evaporator, it is possible to exhibit the original performance of the absorber.

[Brief explanation of the drawing]

The drawings are schematic illustrations of embodiments of use of the invention. 1...Absorber, 2...Evaporator, 3...Fin, 4
... Downstream pipe, 5... Condenser, 6... Downstream pipe, 7.
...Low temperature regenerator, 8...Fan, 9...High temperature regenerator, 10...Burner, 11...High temperature heat exchanger, 12.
...Low temperature heat exchanger, 3...Absorption liquid pump, 14°5...Heat exchanger.

Claims (1)

[Claims] 1. In a parallel flow air-cooled absorption refrigerator, at least two heat exchangers are installed at the downstream pipe position of the absorber to cool the concentrated liquid flowing out from the outlet of the low-temperature heat exchanger with cooling air. The heat exchanger on the upstream side is cooled with the cooling air on the outlet side of the downstream pipe, and the heat exchanger on the most downstream side is cooled with the cooling air on the inlet side of the downstream pipe, and the sufficiently cooled concentrated liquid is cooled. An air-cooled absorption chiller characterized by dispersion using an absorber.