JPH0236867B2 - KYUSHUREITOKISEIGYOSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption refrigerator control device. 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, 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 piping , 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 heat source pipe, 22
23 is a cooling water pipe, 23 is a chilled water pipe, and 24 is a cooling water pump. The pipes are connected as shown in the figure. The refrigerant evaporated in the high pressure regenerator 1 passes through the low pressure regenerator 2 and enters the condenser 3, and the cooling water is supplied to the condenser 3. After exchanging heat with the water in the pipe 22 to condense and liquefy, it enters the evaporator 4 and flows into the cold water pipe 23
It exchanges heat with the water inside and evaporates, and the heat removed at this time cools the water inside 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 become diluted by absorbing the refrigerant, is transferred to a low-temperature heat exchanger 6,
It enters the high-pressure regenerator 1 through the high-temperature heat exchanger 7, where it is heated by the heat source supplied through the heat source piping 21, evaporates and separates the refrigerant, and becomes a medium-concentration solution, which is then transferred to the high-temperature heat exchanger. 7 and enters the low-pressure regenerator 2, where it 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, starting the refrigeration cycle. conduct.

Conventionally, in the above-mentioned 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. Then, 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 set liquid level target value, and the circulating amount control valve 3
4 to control the amount of solution circulated, thereby controlling the capacity of the mechanism to adapt to the load.

As mentioned above, capacity control has conventionally been performed using two feedback controls, but the largest disturbance applied to these control systems is the load, that is, the cold water inlet temperature.

However, the above-mentioned control device has a problem of poor controllability because the control operation is started after the influence of the disturbance appears on the chilled water outlet temperature or the high-pressure regenerator solution level.

The present invention has been proposed in view of the above-mentioned points, and an object thereof is to provide an absorption chiller control device that can perform stable control with good load followability.

The absorption chiller control device of the present invention includes a control system that detects the cold water outlet temperature and controls the amount of heat source to the regenerator, and a control system that detects the regenerator solution level and controls the amount of solution circulated from the absorber to the regenerator. A control system is provided to control the amount of heat source in the heating source amount control system by detecting the cold water inlet temperature, determining an appropriate value for the amount of heating source for the same temperature, and controlling the amount of heating source in the heating source amount control system based on this value. It is characterized by the fact that it has been provided.

The absorption chiller control device of the present invention also includes a control system that detects the cold water outlet temperature and controls the amount of heat source to the regenerator, and a control system that detects the regenerator solution level and controls the solution circulation from the absorber to the regenerator. In addition to providing a control system for controlling the amount, the system detects the cold water inlet temperature, determines an appropriate value of the solution circulation amount for the same temperature, and uses this value to perform feedforward control of the solution circulation amount in the solution circulation amount control system. It is characterized by the provision of a system. According to the above, it is possible to detect the cooling inlet temperature, find an appropriate value for the amount of heating source for this temperature, and use this value as a feed forward signal to control the amount of heating source in advance.
Furthermore, it is possible to similarly determine the appropriate value of the solution circulation amount for the cold water inlet temperature, and to control the solution circulation amount in advance by using this value as a feed forward signal. Here, if the cold water inlet temperature goes up or down, it means that the load has increased or decreased, that is, the capacity of the machine can be increased or decreased by increasing or decreasing the amount of heating source or the amount of solution circulation, and the cold water inlet temperature By detecting this and performing the above-described control, it is possible to perform stable control with good followability to the load.

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

In FIG. 2, reference numerals 1 to 34 indicate the same components as the conventional device shown in FIG. 1 described above, and they perform the same functions.

In this embodiment, a temperature detector 101 for detecting the cold water outlet temperature is further provided, and based on the cold water inlet temperature detected by this detector, the amount of heating source for this cold water inlet temperature is determined based on a preset function. and function generators 102 and 103 for determining the appropriate value of the solution circulation amount.
The comparator 10 uses the appropriate values obtained in steps 02 and 103 and the outputs of the controllers 28 and 33.
4 and 105, the heat source amount control valve 29 and the solution circulation amount control valve 34 are controlled.

In the above configuration, the function generators 102 and 103
A predetermined appropriate function is set for each.

Here, an increase or decrease in the cold water inlet temperature means that the load has increased or decreased, that is, the capacity of the machine may be increased or decreased by increasing or decreasing the amount of heat source or the amount of solution circulation. On the other hand, when the cold water inlet temperature detector 101 detects the cold water temperature and inputs it to the function generators 102 and 103, the function generator 10
At step 2, 103, appropriate values for the amount of heating source and the amount of solution circulation for this cold water inlet temperature are determined and output based on a preset function. Now, when the cold water inlet temperature decreases, the output of the function generators 102 and 103 decreases, reducing the amount of heating source and the amount of solution circulation, and conversely, when the temperature of the cold water inlet increases, the amount of heating source and the amount of solution circulation increases, Controls the amount of heat source and solution circulation according to the load.

As described above, by using the cold water inlet temperature as a feedforward signal for controlling the amount of heating source or solution circulation, stable control with good followability to the load can be realized.

In the above embodiment, an example was described in which both the amount of heat source and the amount of solution circulation were controlled at the same time, but only one of them may be controlled.

[Brief explanation of drawings]

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 pump, 16...Ejector, 17 to 19
... Refrigerant piping, 20 ... Refrigerant pump, 21 ... Heat source piping, 22 ... Cooling water piping, 23 ... Chilled water piping, 24 ... Cooling water pump, 25 ... Chilled water outlet temperature detector, 26 ... Temperature setting device, 27...Comparator, 28...Controller, 29...Heating source amount control valve, 30...Liquid level detector, 31...Liquid level setting device, 32...Comparator, 33...Controller ,3
4...Solution circulation amount control valve, 101...Cold water inlet temperature detector, 102, 103...Function generator, 10
4,105... Comparator.

Claims (1)

[Claims] 1. A control system that detects the cold water outlet temperature and controls the amount of heat source to the regenerator, and a control system that detects the solution level in the regenerator and controls the amount of solution circulated from the absorber to the regenerator. In addition to providing a control system, a control system is provided that detects the cold water inlet temperature, determines an appropriate value of the amount of heating source for the same temperature, and uses this value to feed forward control the amount of heating source in the heating source amount control system. An absorption chiller control device characterized by: 2. Provide a control system that detects the cold water outlet temperature and controls the amount of heat source to the regenerator, and a control system that detects the solution level in the regenerator and controls the amount of solution circulated from the absorber to the regenerator, The absorption system is characterized in that a control system is provided which detects the cold water inlet temperature, determines an appropriate value of the solution circulation amount for the same temperature, and uses this value to perform feedforward control of the solution circulation amount in the solution circulation amount control system. Refrigerator control device.