JPS6113549B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single/double effect absorption refrigerator, and aims to provide economical and stable operation depending on the heat source and load.

In other words, one absorption chiller operates as a single effect when using a low temperature heat source such as solar hot water or low temperature water, and operates as a double effect or single effect when using a high temperature heat source such as city gas, kerosene, or high temperature water. This is used in combination with the heat source to make effective use of the heat source.

The present invention will be described below with reference to embodiments shown in the drawings. 1 is a direct-fired high-temperature generator that has a combustion heating chamber 2 for a high-temperature heat source such as city gas or kerosene, and heat exhaust pipes 3, 3, etc. from the heating chamber, and heats and separates a refrigerant from a dilute liquid; 4;
5 is a first low temperature generator that reheats the refrigerant vapor sent from the high temperature generator 1 as a heat source and further heats and separates the intermediate liquid refrigerant; A condenser that condenses and cools the refrigerant; 7 is an evaporator that obtains cold water for air conditioning from a water cooler 8 using latent heat when the liquid refrigerant from the condenser 5 is dispersed and vaporized; By scattering the concentrated liquid from which the refrigerant has been separated in the first low-temperature generator 4 and absorbing the refrigerant vapor in the container, the inside of the evaporator 7 can be maintained at a low pressure and a continuous supply of cold water can be performed. The absorbers 10 and 11 are a low-temperature heat exchanger and a high-temperature heat exchanger, which include a refrigerant vapor pipe 12, a refrigerant liquid downflow pipe 13, a refrigerant circuit 15 with a refrigerant pump 14, and a dilute liquid absorber with an absorption liquid pump 16. A refrigeration cycle is constructed by connecting the pipes through a pipe 17, an intermediate liquid pipe 18, and a concentrated liquid pipe 19.
20 is a hot water heat exchanger provided between the high temperature generator 1 and the refrigerant vapor pipe 12.

Reference numeral 21 denotes a second low-temperature generator whose heat source is a low-temperature heat source provided in the dilute liquid pipe line 17a located between the low-temperature heat exchanger 10 and the high-temperature heat exchanger 11. A solution circulation pump 22 is interposed between the heat exchanger 11 and the second low temperature generator 2
The upper space of 1 and the condenser 5 are connected by a refrigerant pipe 23.

24 is the second low temperature generator 21 and the concentrated liquid pipe line 19;
The high temperature generator 1, the high temperature heat exchanger 11, and the first low temperature generator 4 are appropriately bypassed by the bypass pipe connecting the high temperature generator 1, the high temperature heat exchanger 11, and the first low temperature generator 4. Further, the dilute liquid pipe line 17a and the intermediate liquid pipe line 18 are provided with on-off valves 25 and 26, and U-shaped seal pipe portions 27 and 28 are formed on the upstream and downstream sides of these on-off valves, respectively. Note that the pipes 17a and 18 do not necessarily have to be formed with a U-shaped seal pipe portion.

Next, the operation will be explained.

(a) Single-effect operation In this case, the solution circulation pump 22 is stopped and the second low-temperature generator 21 is heated by a low-temperature heat source, so that the refrigerant is heated and separated from the dilute liquid, liquefied in the condenser 5, and then flows into the evaporator 7. vaporize here. Cold water for air conditioning is obtained from the water cooler 8 due to the latent heat at this time.

On the other hand, since the solution circulation pump 22 has stopped operating, the liquid level in the second low temperature generator 21 rises, and the concentrated liquid from which the refrigerant has been separated from the dilute liquid flows into the bypass pipe 24 and passes through the low temperature heat exchanger 10. The refrigerant is dispersed into the absorber 9, absorbs the vaporized refrigerant, and becomes a dilute liquid. This diluted liquid flows into the second low temperature generator 21 through the low temperature heat exchanger 10 by the absorption liquid pump 16, and the above-described cycle is repeated again.

Roni heavy-effect operation In this case, the solution circulation pump 22 is operated and a high-temperature heat source such as city gas is combusted in the combustion heating chamber 2, thereby generating the high-temperature generator 1, the first low-temperature generator 4,
Condenser 5, evaporator 7, absorber 9, low temperature heat exchanger 1
0 and the high-temperature heat exchanger 11 constitute a refrigeration cycle, and cold water for cooling is supplied from the water cooler 8 and hot water for temperature adjustment is supplied from the hot water heat exchanger 20.

In this case, the second low temperature generator 21 may be heated with a low temperature heating source to perform a combined single effect and double effect operation.

Also, when heating with hot water, open/close valve 2
5, 26 and the on-off valve 29 of the refrigerant steam pipe 12 are closed to circulate the refrigerant between the high temperature generator 1 and the hot water heat exchanger 20, and the hot water heat exchanger 20 produces hot water.

As described above, the present invention provides a dual-effect absorption refrigerator that connects a high temperature generator, a first low temperature generator, a condenser, an evaporator, an absorber, a low temperature heat exchanger, and a high temperature heat exchanger to form a refrigeration cycle. A second low temperature generator heated by a low temperature heat source and a solution circulation pump are installed in the dilute liquid pipe line located between the low temperature heat exchanger and the high temperature heat exchanger, and the second low temperature generator and the concentrated liquid The high temperature generator, the high temperature heat exchanger and the first
Install bypass piping to bypass the low temperature generator,
Since the solution circulation pump is configured to stop when there is a single effect and to operate when there is a double effect, 1.
The absorption chiller can be operated in single effect, double effect, or a combination of both depending on the heating source and load condition, allowing effective use of energy and economical operation. Further, there are practical effects such as being able to easily perform switching operation by turning on and off the solution circulation pump.

[Brief explanation of the drawing]

The drawing is a circuit diagram of a single/double effect absorption refrigerator according to the present invention. 1... High temperature generator, 4... First low temperature generator, 5... Condenser, 10... Low temperature heat exchanger, 11... High temperature heat exchanger, 21... Second low temperature generator, 22... Solution pump,
24...Bypass piping.

Claims (1)

[Claims] 1. In a dual-effect absorption refrigerator that connects a high-temperature generator, a first low-temperature generator, a condenser, an evaporator, an absorber, a low-temperature heat exchanger, and a high-temperature heat exchanger to form a refrigeration cycle, the low-temperature heat exchanger A second low-temperature generator heated by a low-temperature heat source and a solution circulation pump are installed in the diluted liquid line located between the container and the high-temperature heat exchanger, and the high-temperature generator and the concentrated liquid line are provided with a second low-temperature generator heated by a low-temperature heat source and a solution circulation pump. A single/double effect absorption refrigerating machine, characterized in that the solution circulation pump is provided with a bypass pipe that bypasses the heat exchanger, the high temperature heat exchanger, and the first low temperature generator, and the solution circulation pump is stopped when the single effect is used and is operated when the double effect is used.