JPS58158466A - Controller for absorption refrigerator - 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] Yes. An example of a conventional absorption refrigerator control device will be explained based on FIG. 1. The one shown in FIG. 1 is a double-effect absorption refrigerator that uses water as a refrigerant and an aqueous lithium bromide solution as an absorbent (solution).

In the figure, l is a high-pressure regenerator and 2 is a low-pressure regenerator. 3 is a condenser, 4 is an evaporator, 5 is an absorber, and 6 is a low temperature heat exchanger. 7
is a high temperature heat exchanger. 8 to 13 are solution pipes, 14 is a regenerator pump, 15 is an absorber pump, 16 is an ejector,
17 to 19 are refrigerant pipes.

20 is a refrigerant pump, 21 is a heating source pipe, 22 is a cooling water pipe, 23 is a cold water pipe, and 24 is a cooling water pump.

enter. After exchanging heat with the water in the cooling water pipe 22 and condensing and liquefying it. The water enters the evaporator 4, exchanges heat with the water in the cold water pipe 23, and evaporates, and the heat removed at this time cools the water in the cold water pipe 23.

On the other hand, the refrigerant evaporated in the evaporator 4 is absorbed by the solution in the absorber 5, and the solution whose concentration has become diluted by absorbing the refrigerant is regenerated at high pressure by the pump 14 through the low-temperature heat exchanger 6 and the high-temperature heat exchanger 7. Enter the container.

Here, it is heated by the heat source supplied through the heat source piping 2l, and the refrigerant is evaporated and separated to become a medium concentration solution.
The refrigerant enters the low-pressure regenerator 2 via the high-temperature heat exchanger 7, is heated by refrigerant vapor, and further evaporates and separates the refrigerant, increasing its concentration. The solution that has become highly concentrated in the low-pressure regenerator passes through the low-temperature heat exchanger 6, mixes with the solution from the absorber pump 15 in the ejector 16, and is sprayed into the absorber 5. I do.

Conventionally, in the above-described dual-effect absorption refrigerator, a chilled water outlet temperature detector 25 detects the chilled water outlet temperature, and a comparator 27 compares this with a chilled water outlet temperature target value set in a temperature setting device 26. In comparison, the flow rate adjustment valve 29 is controlled via the flow rate regulator 28 to adjust the flow rate of the heating source, and the solution level in the high pressure regenerator 1 is detected by the liquid level detector 30. The comparator 32 compares the liquid level with the liquid level target value set at It controls the capacity of

However, in the above-mentioned control device, the amount of solution circulated is only used to monitor the liquid level in the high-pressure regenerator, and the efficiency is not controlled, so there is a problem of poor efficiency especially at partial loads. was there. The present invention has been proposed in view of the above-mentioned points, and its object is to provide an absorption refrigerator control device that can improve efficiency particularly under partial loads. The present invention includes a control system that controls the amount of heat source in the regenerator by detecting the pressure inside the regenerator, and a control system that controls the amount of solution circulating from the absorber to the regenerator by detecting the cold water outlet temperature. It is characterized by the fact that when the chilled water outlet temperature rises and falls in response to the load,
This is detected and the solution circulation amount is controlled, and when the solution circulation amount is increased or decreased, the pressure inside the regenerator changes accordingly, or
This is because the pressure inside the regenerator can be kept constant by controlling the amount of heat source.

The regenerator can be operated while maintaining its internal pressure at a high level.

The higher the pressure in the regenerator is within the range that does not exceed the upper limit, the better the efficiency. Therefore, by operating the regenerator at a high pressure as described above, efficiency can be improved especially at partial load, and furthermore, Stable operation can be achieved by preventing excessive pressure rise.

The present invention will be explained below based on illustrated embodiments.

In FIG. 2, reference numerals 1 to 24 are similar to the conventional one shown in FIG. 1, and the refrigeration cycle is performed by the same function.

In this embodiment, a cold water outlet temperature detector 101 is provided to detect the cold water outlet temperature, and a temperature setting device 102 is used to detect the cold water outlet temperature.
The comparator 103 compares the set value set to At the same time, a pressure detector 106 is provided in the high pressure regenerator 1 to detect the internal pressure of the high pressure regenerator, and a comparator 108 compares this with a set value set in the pressure setting device 107. Heating source amount control valve 1
10 to control the amount of heat source supplied to the high pressure regenerator 1.

In the above configuration, when the load decreases and the cold water outlet temperature detected by the detector 101 becomes lower than the set value, the input to the controller 104 becomes negative, its output decreases, and the amount of solution circulated is reduced. It acts to keep the outlet temperature constant.

On the other hand, when the amount of solution circulation decreases, the pressure within the high-pressure regenerator 1 increases in response to the amount of decrease.

When the pressure detected by the detector 106 becomes higher than the set value, the input to the controller 109 becomes negative 9, its output decreases, and the amount of heat source to the high pressure regenerator 1 is reduced. Control the pressure to be constant. here,
As long as the pressure inside the high pressure regenerator 1 does not exceed the upper limit, the higher the pressure, the better the efficiency, and as mentioned above, the pressure inside the high pressure regenerator 1 should be maintained at a high state according to the load during operation. Since it is possible to improve efficiency at partial loads by as little as 1%.

Further, since it is possible to prevent the pressure inside the high-pressure regenerator from increasing excessively, stable operation can be performed.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a conventional one, and FIG. 2 is a configuration diagram showing an embodiment of the present invention. 1: high pressure regenerator, 2: low pressure regenerator, 3: condenser. 4: Evaporator, 5: Absorber, 6: Low temperature heat exchanger. 7; High temperature heat exchanger, 8 to 13: Solution piping, ] 4: Regenerator pump, 15: Absorber pump, 16: Ejector, 1
7 to 19: Refrigerant piping, 20: Refrigerant pump. 21: heating source piping, 22: cooling water piping, 23: cold water piping, 24: cooling water pump, 101: cold water outlet temperature detector, 102: temperature setting device, 103: comparator. 104: Controller, 105: Solution circulation amount control valve. 106: High pressure regenerator internal pressure detector, 107: Pressure setting device, 108: Comparator, 109: Controller. 11O: Heating source amount control valve

Claims (1)

[Claims] It is equipped with a control system that controls the amount of heat source in the regenerator by detecting the pressure inside the regenerator, and a control system that controls the amount of solution circulating from the absorber to the regenerator by detecting the cold water outlet temperature. Characteristic absorption chiller control device.