JPH02192552A - Air-cooled absorptive type freezer - Google Patents

Abstract

PURPOSE:To prevent liquid of high concentration from being flashed within an absorber and make a sufficient absorption of refrigerant vapor from an evaporator with an absorbing liquid within an absorber by a method wherein the solution of high concentra tion is cooled by a heat exchanger arranged in the midway of a high concentration liquid pipe extending from an outlet of a low temperature heat exchanger to the absorber, thereafter it is sprayed by the absorber. CONSTITUTION:Dilution liquid accumulated in an absorber 1 is guided through an absorptive liquid pump 13 from a low temperature heat exchanger 12 to a high tempera ture regenerator 9 having a burner 10 via a high temperature heat exchanger 11, the high concentration liquid generated at the high temperature regenerator 9 is guided to a low temperature regenerator 3. A flowing-down pipe 6 having some fins 3 at an upper part of the condensor 5 is arranged at a lower part of the low temperature regenerator 7 and then a fan 8 is mounted at an intermediate upper part of the opposed flowing-down pipes 4 and 6. In this case, the intermediate concentrated liquid flowed out of the low temperature regenerator 7 is passed through the low temperature heat exchanger 12, guided to a high concentrated liquid cooler 14 acting as an air cooled heat exchanger arranged above the evaporator 2 and this liquid is sprayed over the absorptive unit 1.

Description

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

- Prior Art> As a conventional technology of an air-cooled absorption refrigerator, for example, Japanese Patent Laid-Open No. 58-208559 is known. In this case, the absorption chiller has a configuration in which the concentrated liquid that exits the low-temperature heat exchanger is recycled directly, or the dilute acid sent from the absorber to the high-temperature regenerator is recirculated, mixed with the concentrated liquid, and sprayed onto the absorber. It becomes as.

<Problem to be solved by the invention> However, in this type of conventional air-cooled absorption refrigerator,
Since 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 the concentrated liquid is sprayed into the absorber,
Due to flashing, there is a problem in that a vertical falling liquid type absorber having a limited length cannot sufficiently absorb refrigerant evaporation 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 refrigerator that cools the concentrated liquid with cooling air in the middle of the concentrated liquid pipe line from the outlet of the low-temperature heat exchanger to the absorber. An exchanger is provided, and after the concentrated liquid is cooled by the heat exchanger, it is sprayed by an absorber.

Due to the above configuration, the concentrated liquid flowing out from the high temperature regenerator to the low temperature regenerator passes through the low temperature heat exchanger and is cooled with cooling air in the heat exchanger on its way to the absorber. Since the liquid is cooled to below the saturation temperature of the pressure inside the absorber, there is no flash of concentrated liquid in the absorber, and the refrigerant vapor passage inside the absorber is only for the refrigerant vapor generated in the evaporator. , the pressure loss of refrigerant vapor in the absorber is also small.

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

Reference numeral 1 denotes an absorber in which a downflow pipe 4 with fins 3 is arranged vertically at the top, and an evaporator 2 is provided at the upper end of the absorber 1.
The dilute acid accumulated in the absorber 1 is transferred from the low temperature heat exchanger 12 to the high temperature heat exchanger 11 via the absorbent pump 13 to the burner 10.
The concentrated liquid generated in the high-temperature regenerator 9 is guided to the low-temperature regenerator 3, and the lower part of the low-temperature regenerator 7 is provided with fins 3 disposed on the upper part of the condenser 5. A downflow pipe 6 is provided, and a fan 8 is installed above the middle of the opposing downflow pipes 4 and 6 to form a parallel flow type air-cooled absorption refrigerator.

In this case, the intermediate concentrated liquid flowing out from the low-temperature regenerator 7 passes through the low-temperature heat exchanger 12 and is guided to the concentrated liquid cooler 14 which is an air-cooled heat exchanger disposed above the evaporator 2. The composition is such that it is sprayed on the top of 1.

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 regenerated at a low temperature via the high-temperature heat exchanger 11. The intermediate concentrated liquid dispersed in the container 7 and accumulated in the low-temperature regenerator 7 is further cooled in the concentrated liquid cooler 14 which passes through the low-temperature heat exchanger 12 and receives cooling air flowing by the rotation of the fan 8.
Since the absorber 1 is cooled to a temperature below the saturation temperature of the internal pressure, the concentrated liquid does not flash within the absorber 1. Therefore, in the refrigerant vapor passage in the absorber 1, the refrigerant flowing from the condenser 5 is evaporated in the evaporator 2, and only the refrigerant vapor generated in the evaporator 2 is present. This results in less pressure loss.

<Effects of the Invention> As described above, the air-cooled absorption refrigerator of the present invention is provided with an air-cooled heat exchanger in the middle of the concentrated liquid pipe line from the low-temperature heat exchanger to the absorber, and the temperature of the concentrated liquid is adjusted to the absorber. Since it is cooled to below the saturation temperature of the internal pressure, it does not cause flash even if it is sprayed into the absorber.Therefore, only the refrigerant vapor generated in the evaporator is present in the refrigerant vapor passage in the absorber. The pressure loss of the refrigerant vapor within the absorber is also small, which has the effect of improving the 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 ... bar, 11 ... high temperature heat exchanger, 12.
...Low temperature heat exchanger, 13...Absorption liquid pump, 14...
・Concentrated liquid cooler.

Claims (1)

[Claims] 1. In a parallel flow air-cooled absorption refrigerator, a heat exchanger for cooling the concentrated liquid with cooling air is installed in the middle of the concentrated liquid pipe line from the outlet of the low-temperature heat exchanger to the absorber, and the heat exchanger cools the concentrated liquid with cooling air. An air-cooled absorption chiller characterized by cooling the liquid and then dispersing it in an absorber.