JPS5854345B2 - Absorption chiller control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an absorption refrigerator that remotely sets the temperature at which cold water or hot water is taken out. The purpose is to prevent overcooling or overheating and to achieve economical operation.

Generally, when proportional control is applied to an absorption chiller that supplies chilled water or hot water to a load for cooling or heating, as the load becomes smaller, the cooling water temperature also decreases, and the cold water extraction temperature decreases. The temperature will be lowered, resulting in operation at a lower chilled water extraction temperature, contrary to the request from the load side.

Therefore, the present invention is designed to automatically obtain a cold water take-out temperature according to the load by outputting a signal of displacement according to the cooling load factor from the load side, thereby enabling very economical operation.

The present invention will be described below with reference to embodiments shown in the drawings.

1 is a high-temperature generator that has a combustion heating chamber 2 for burning a heat source such as gas or oil, and heat exhaust pipes 3, 3 . 5 is a low-temperature generator that further heats and separates the intermediate liquid refrigerant using the refrigerant vapor sent out as a heat source; 5 is a condenser that cools and condenses the refrigerant flowing from both generators 1 and 4 using a cooler 6; An evaporator is configured to obtain cold water for air conditioning from a water cooler 8 by utilizing the latent heat generated when the liquid refrigerant from the condenser 5 is dispersed and vaporized. Absorbers 10 and 11 are configured to keep the inside of the evaporator 7 at a low pressure and continuously supply cold water by scattering liquid and absorbing refrigerant vapor inside the vessel. In the heat exchanger, these are refrigerant vapor pipes 12,
A refrigeration cycle is constructed by connecting a refrigerant liquid down-flow pipe 13, a refrigerant circulation path 15 having a refrigerant pump 14, a replenishing liquid pipe 17 having an absorption liquid pump 16, an intermediate liquid pipe 18, and a concentrated liquid pipe 19.

20 is a water heater attached to the high temperature generator 1, 21.22
, 23 is a switching shutoff well that switches between cold and hot conditions.

24 is a heat source control valve provided in the high temperature generator 1;
The control valve receives a signal from a remote setting device 25 and a cold water temperature detector 26 provided at the outlet of the water cooler 8, or a cold/temperature changeover switch 2.
7, the temperature controller 29 is controlled by the remote setting device 25 and the output of the temperature controller 29 which uses signals from the hot water temperature detector 28 provided at the outlet of the water heater 20.

The temperature controller 29 is a remote setting device 25 such as a variable resistor.
The signal from the remote setting device 25 is a signal for correcting the main setting of the temperature controller 29.

For example, when taking out cold water for cooling from the water cooler 8, if the main setting of the temperature controller 29 is 7°C, the remote setting device 25
The main setting is 7℃ as a signal from O to +1...
The temperature controller 29 is provided with a function that does not cause the following.

That is, the remote setting device 25 issues a setting correction signal to the temperature controller 29 to add the temperature to the main setting temperature (for example, 7° C.) of the temperature controller 29, and changes the setting temperature of the temperature controller 29 to the main setting temperature. The above settings are corrected.

For example, if the set temperature of the temperature controller 29 corrected by the remote setting device 25 is 8° C., when the temperature sensed by the cold water temperature detector 26 becomes higher than 8° C., the temperature will be changed via the temperature controller 29. The opening degree of the heat source control valve 24 is controlled to increase based on the signal from the cold water temperature detector 26, and the temperature of the cold water taken out is adjusted so as to immediately return to 8°C. When it gets low, the temperature regulator 29
The heat source control valve 2 receives a signal from the cold water temperature detector 26 via the
The opening degree of 4 is controlled to decrease and the cold water extraction temperature immediately drops to 8.
As a result of adjusting the temperature to return to 8°C, the temperature at which the cold water is taken out is maintained at approximately 8°C.

In addition, all of the switching valves 21, 22, and 23 are closed, and the cold/hot changeover switch 27 is switched from the cold junction C side to the hot junction H.
When switching to the side and taking hot water for heating from the water heater 20, if the main setting of the temperature controller 29 is 60°C, the main setting is 60°C as a signal from the remote setting device 25 from O to -1...
The temperature controller 29 is provided with a function that does not exceed the above.

That is, the remote setting device 25 issues a setting correction signal to the temperature controller 29 to subtract the temperature from the main setting temperature (for example, 60° C.) of the temperature controller 29, and changes the setting temperature of the temperature controller 29 to the main setting temperature. The settings are corrected as follows.

For example, when the set temperature of the temperature controller 29 corrected by the remote setting device 25 is 56° C., the heat source control valve 24 is controlled by a signal from the hot water temperature detector 28 via the temperature controller 29. The temperature at which hot water is taken out is maintained at approximately 56°C.

FIGS. 2 and 3 show characteristic diagrams showing the relationship between the main set temperature and the remote set temperature using the set magnification as a parameter for the cases when cold water is taken out and when hot water is taken out, respectively.

In this way, it becomes possible to operate the absorption refrigerator at a temperature higher than the main set temperature of the temperature controller 29 during cooling, and at a lower temperature during heating.

As described above, the present invention includes a high temperature generator, a low temperature generator condenser,
In an absorption refrigerator in which a refrigeration cycle is constructed by connecting an evaporator, an absorber, and a solution heat exchanger with piping, a heat source control valve and a water heater are attached to the high temperature generator, and a cold water temperature detector and a hot water temperature detector are connected to each other. Equipped with a temperature controller that receives signals from
Also, when taking out cold water, a setting correction signal is sent to the temperature controller to add the temperature to the main set temperature of cold water of this temperature controller, and when taking out hot water, a setting is made to subtract the temperature from the main set temperature of hot water of the temperature controller. A remote setting device is provided for issuing a correction signal to a temperature controller, and the heat source control valve is controlled by a signal from a cold water temperature detector or a hot water temperature sensor via the temperature controller whose setting is corrected by the remote setting device. Since the sensing temperature of these temperature detectors, that is, the temperature at which cold and hot water is taken out, is adjusted to the set temperature corrected by the remote setting device, operation can always be continued within the designed drawing temperature, and there is no overflow of chilled water. It is possible to prevent overheating of cold or hot water and to perform economical operation.

Furthermore, if a setting correction signal corresponding to the load factor is applied to the temperature controller that performs the main setting using the remote setting device, the cold/hot water take-out temperature according to the load can be automatically obtained, and even more economical operation can be performed.

[Brief explanation of the drawing]

Figure 1 is a block diagram of an absorption refrigerator equipped with the device of the present invention;
FIG. 3 and FIG. 3 are characteristic diagrams showing the relationship between the main set temperature and the remote set temperature using the set magnification as a parameter when cold water is taken out and when hot water is taken out. DESCRIPTION OF SYMBOLS 1... High temperature generator, 8... Water cooler, 20... Water heater, 24... Heat source control valve, 25... Remote setting device, 2
6...Cold water temperature detector, 29...Temperature regulator, 28
・・・Hot water temperature detector,

Claims (1)

[Claims] 1. In an absorption refrigerator in which a refrigeration cycle is constructed by connecting a high-temperature generator, a low-temperature generator, a condenser, an evaporator, an absorber, and a solution heat exchanger with piping, a heat source control valve and a water heater are attached to the high-temperature generator. and a temperature controller that receives signals from a cold water temperature detector provided at the outlet of the water cooler formed by the evaporator and a hot water temperature detector provided at the outlet of the water heater, and when taking out the cold water. A setting correction signal is sent to the temperature controller to add the temperature to the cold water main setting temperature of the temperature controller, and a setting correction signal is sent to the temperature controller to subtract the temperature from the hot water main setting temperature when hot water is taken out. The heat source control valve is controlled by a signal from a cold water temperature detector or a hot water temperature detector through a temperature controller whose setting is corrected by the remote setting device, and the temperature at which the cold and hot water is taken out is controlled. 1. A control device for an absorption refrigerator, characterized in that a set temperature corrected by a remote setting device is adjusted.