JPS5832112Y2 - Absorption chiller/heater control device - Google Patents

Description

[Detailed description of the invention] This invention relates to a control device for an absorption chiller/heater, and when hot water for reheating is simultaneously taken out during cooling operation by supplying cold water, the hot water temperature that occurs when the load on the hot water side becomes minimum The purpose is to prevent overheating.

In a conventional absorption chiller/heater that simultaneously takes out hot water during cooling operation by supplying chilled water, the temperature of the hot water is controlled by opening and closing a solenoid valve to control the liquid level of the refrigerant drain in the water heater.

When the load on the hot water side becomes zero, the solenoid valve is fully closed to fill the refrigerant drain in the water heater, reducing the heat exchange between the refrigerant vapor and the hot water to zero, but the hot water system If the heat loss in the piping is small, the hot water temperature will continue to rise due to heat transfer from the generator and heat input from the hot water pump power, leading to overheating.

This proposal has been made in view of the above points, and the embodiments shown in the drawings will be described below.

1 is a high-temperature generator that has a combustion heating chamber 2 for burning gas or oil and exhaust heat pipes 3, 3, etc. of the heating chamber and heats and separates the refrigerant from the diluted liquid; 4 is the high-temperature generator; 5 is a low temperature generator that further heats and separates the intermediate liquid refrigerant using the refrigerant vapor sent out from 1 as a heat source; 5 is a condenser that uses a cooler 6 to cool and condense the refrigerant flowing from both generators 1 and 4; 7; 9 is an evaporator which obtains cold water for cooling from a water cooler 8 by utilizing the latent heat generated when the liquid refrigerant is dispersed and vaporized from the condenser 5; The absorber 10 and 11 are designed 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. The exchanger includes a refrigerant vapor pipe 12, a refrigerant liquid down-flow pipe 13, a refrigerant circuit 15 with a refrigerant pump 14,
A refrigeration cycle is constructed by connecting a dilute liquid pipe 17 with an absorption liquid pump 16, an intermediate liquid pipe 18, and a concentrated liquid pipe 19.

20, a water heater attached to the high temperature generator 1, 21, 22;
．． 23 is an on-off valve that switches between cold and hot temperatures.

Reference numeral 24 denotes a fuel control valve provided in the high temperature generator 1, which receives a signal from a cold water temperature detector 25 provided at the outlet of the water cooler 8 through a cold junction C of the first cold/temperature changeover switch 26. It is controlled by the output of the first temperature regulator 27 as an input, and the signal from the hot water temperature detector 28 at the outlet of the water heater 20 is transferred to the hot junction H of the second cold/hot changeover switch 29 and the first cold/hot changeover switch 26. The first input signal is input via the hot junction H.
It is also controlled by the output of the temperature regulator 27.

30 is a refrigerant liquid return pipe 3 between the high temperature generator 1 and the water heater 20
The control valve is controlled by the output from the second temperature regulator 32 which receives the signal from the hot water temperature detector 28 through the cold junction C of the second cold/temperature changeover switch 29. Ru.

Reference numeral 33 denotes a radiator for exchanging heat between a part of the diluted liquid circulation path 34 and a part of the hot water circulation path 35, and a solenoid valve 36 is provided on the inlet side of the diluted liquid circulation path 34 to the radiator. is opened and closed by a signal from a hot water temperature detector 37 provided at the outlet of the water heater 20.

The radiator 33 may be formed by exchanging heat between a part of the cooling water circulation path 38 and a part of the hot water circulation path 35 which are parallel to the condenser 5 and absorber 9, as shown in FIG. A solenoid valve 36 is provided in the hot water circulation path 35 to control the refrigerant drain control valve 3.
The reverse operation may be performed in conjunction with 0.

On-off valves 21 and 22 that switch between cold and hot in the above configuration
．． 23 are fully opened to perform cooling operation by supplying cold water, and at the same time supplying hot water for reheating from the water heater 20, when the hot water load becomes zero, a signal from the hot water temperature detector 28 triggers the refrigerant drain control valve. 30 is closed to fill the water heater 20 with refrigerant drain, and at the same time, the solenoid valve 36 is opened in response to a signal from the hot water temperature detector 37, and the hot water flowing through the hot water circulation path 35 and the low-temperature diluted liquid flowing through the diluted liquid circulation path 34 are removed. is exchanged with the radiator 33 to prevent overheating in the water heater 20 and raise the temperature of the diluted liquid, thereby improving the heating efficiency in the high temperature generator 1.

In addition, in the embodiment shown in FIG. 2, when the hot water load becomes zero, the refrigerant drain control valve 30 is closed in response to a signal from the hot water temperature detector 28, and the water heater 20 is filled with refrigerant drain. The electromagnetic valve 36 is opened to allow hot water and cooling water to exchange heat in the radiator 33, thereby preventing the water heater 20 from overheating.

As mentioned above, this proposal includes a high temperature generator, a low temperature generator, a condenser,
A refrigeration cycle is constructed by connecting an evaporator, an absorber, and a solution heat exchanger, and a water heater is attached to the high temperature generator,
In the absorption chiller/heater that supplies cold water and hot water from the evaporator and water heater, heat is radiated by exchanging heat between a part of the low-temperature liquid circulation path such as dilute liquid or cooling water and a part of the hot water circulation path. A solenoid valve is provided in the low temperature liquid circulation path or the hot water circulation path, and the solenoid valve is opened and closed depending on the outlet temperature of the water heater, so that when the hot water load becomes zero, The hot water circulates through the radiator and radiates heat to a low-temperature liquid such as a diluted liquid or cooling water to prevent the water heater from overheating.

Further, when the low temperature liquid is a dilute liquid, the temperature of the dilute liquid supplied to the high temperature generator increases due to heat exchange with hot water, and heating efficiency improves.

[Brief explanation of the drawing]

Figure 1 shows the constituent countries of absorption chiller-heating machines equipped with the proposed device;
The figure shows the constituent countries of another example. 1... High temperature generator, 8... Water cooler, 2
0...Water heater, 33...Radiator, 36
... Solenoid valve, 28 ... Hot water temperature detector.

Claims (1)

[Scope of utility model registration request] 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, and a water heater is attached to the high temperature generator, and cold water is supplied from the evaporator and water heater. and an absorption chiller-heater configured to supply hot water, in which a part of the low-temperature liquid circulation path such as dilute liquid or cooling water and a part of the hot water circulation path exchange heat to form a radiator, and the low-temperature liquid A control device for an absorption chiller/heater, characterized in that a solenoid valve is provided in a circulation path or a hot water circulation path, and the solenoid valve is opened and closed depending on the outlet temperature of the water heater.