JPS58158464A - 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 Figure 1 is a double-effect absorption refrigerator that uses water as the refrigerant. A lithium bromide aqueous solution is used as the absorbent (solution).

In the figure. 1 is a high pressure regenerator, 2 is a low pressure regenerator.

3 is a condenser, 4 is an evaporator, 5 is an absorber, 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 a Ejectors 17 to 19 are refrigerant pipes.

20 is a refrigerant tank, 21 is a heating source pipe, 22 is a cooling water pipe, and 23 is a cold water pipe. 24 is a cooling water pump, which is connected to the piping as shown in the figure, and the refrigerant evaporated in the high-pressure regenerator 1 passes through the low-pressure regenerator 2, enters the condenser 3, and enters the cooling water piping 22.
After condensing and liquefying by exchanging heat with the water inside, the water enters the evaporator 4 and exchanges heat with the water in the cold water pipe 23 to evaporate, 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 a solution in the absorber 5, and the solution, which has absorbed the refrigerant and has become diluted in concentration, is transferred to a low-temperature heat exchanger 6 by a pump l4.

It enters the high-pressure regenerator 1 through the high-temperature heat exchanger 7, where it is heated by a heat source supplied through the heat source piping 21, evaporates and separates the refrigerant, and becomes a medium-concentration solution, which passes through the high-temperature heat exchanger 7. The refrigerant then enters the low-pressure regenerator 2 where it is heated by refrigerant vapor, and the refrigerant is further evaporated and separated, 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 control valve 29 is controlled via the flow rate regulator 28 to adjust the flow rate of the heating source, and the level of the solution in the high-pressure regenerator 1 is detected by the 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 circulation is only used to monitor the liquid level in the high-pressure regenerator, and the efficiency is not controlled.

There was a problem because efficiency at partial loads deteriorated.

The present invention has been proposed in view of the above points.

The purpose is to provide an absorption chiller control device that can improve efficiency under one partial load.

The present invention includes a control system that controls the amount of heat source in the regenerator by detecting the regenerator outlet solution temperature, and a control system that controls the amount of solution circulating from the absorber to the regenerator by detecting the cold water outlet temperature. When the cold water outlet temperature rises or falls in response to the load, this is detected and the solution circulation amount is controlled.
When the solution circulation mu is increased or decreased, the solution temperature at the outlet of the regenerator changes accordingly, but the solution temperature can be kept constant by controlling the amount of heating source.

It can be operated while maintaining the solution temperature in a high state. The temperature of the solution at the outlet of the regenerator must not exceed the upper limit.

The higher the temperature, the better the efficiency. Therefore, by operating the regenerator at a high outlet solution temperature as described above, efficiency can be improved especially at partial loads.

In addition, stable operation can be achieved by preventing excessive rise in solution temperature.

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

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

In this embodiment, a chilled water outlet temperature detector 101 is provided to detect the chilled water outlet temperature, and a comparator 103 compares this with the set value set in the temperature setting device 102.
A solution circulation amount regulating valve 105 is controlled via a valve 104 to control the amount of solution circulated from the absorber 5 to the high pressure regenerator 1, and a solution temperature sensor is installed at the solution outlet of the high pressure regenerator 1. 106 is provided to detect the high pressure regenerator outlet solution temperature, compare this with the set value set in the temperature setting device 107 by the comparator 10B, and control the heating source amount control valve 110 via the controller 109. , the amount of heat source supplied to the high-pressure regenerator 1 is controlled.

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 It constant.

On the other hand, when the bath liquid circulation decreases, the outlet solution temperature of the high-pressure regenerator 1 increases correspondingly to the amount of decrease, but the detector 106
When the detected temperature increases above the set point, the input to the controller 109 becomes negative and its output decreases, reducing the heating source t to the high pressure regenerator 1 and reducing the outlet solution in the high pressure regenerator 1. control to keep it constant. Here, the outlet solution temperature of the high pressure regenerator 1 is within the range of not exceeding the upper limit.
The higher the temperature, the better the efficiency, and as mentioned above, the outlet solution temperature of the high-pressure regenerator 1 can be maintained at a high level 6 in response to the load.

In particular, efficiency can be improved under partial loads.

Furthermore, since it is possible to prevent the temperature of the solution at the outlet of the high-dry regenerator from rising 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, 14: Regenerator pump, 15: Absorber box, 16: Ejector, 1
7 to 19: Refrigerant piping, 20: Refrigerant pipe, 21: Heat source piping, 22: Cooling water piping, 23: Chilled water piping, 24:
Cooling water pump, 101: Cold water outlet temperature detector,
102: Temperature setting device, 103: Comparator. 104; Controller; 105: Solution circulation amount adjustment cell. 106: High pressure regenerator outlet solution temperature detector, 107
: Temperature setting device, 108: Comparator, 109: Conotrol, 110: Heat source amount adjustment box

Claims (1)

[Claims] A control system that controls the amount of heat source of the regenerator by detecting the temperature of the solution at the outlet of the regenerator, and a control system that controls the amount of solution circulating from the absorber to the regenerator by detecting the temperature of the cold water outlet. Characteristic absorption chiller control device.