JPS6148060B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for an absorption chiller using high-temperature water as a heat source, and particularly aims to save energy by effectively utilizing the calorific value of the heat source and to perform control smoothly. .

Generally, the high-temperature water used as a heat source in a double-effect absorption refrigerator is at a temperature that is sufficient for use in a single-effect absorption refrigerator.

Therefore, if a double-effect absorption refrigerator and a single-effect absorption refrigerator are installed in series and high-temperature water is used as a heat source, the high-temperature water can be used effectively.

However, if a dual-effect absorption refrigerator is controlled by the chilled water temperature, the high-temperature outlet temperature fluctuates, and the amount of heat input to the generator of the single-effect absorption refrigerator fluctuates, making stable capacity control impossible.

Therefore, in the present invention, a temperature sensor is provided on the high-temperature water inlet side of the single-effect absorption chiller, and the temperature sensor compensates for the control amount from the cold water temperature sensor to adjust the amount of high-temperature water supplied to the generator. The required amount of heat input is controlled by

The present invention will be described below with reference to embodiments shown in the drawings. 1 is a high-temperature generator that uses high-temperature water as a heat source to heat and separate a refrigerant from a dilute liquid; 2 is a low-temperature generator that uses refrigerant vapor sent from the high-temperature generator 1 as a heat source to reheat and further heat and separate the intermediate liquid refrigerant; 3 is a condenser that condenses and cools the refrigerant flowing from both the generators 1 and 2 by means of a cooler 4; 5 is the condenser 3;
The evaporator 7 is configured to obtain cold water for air conditioning from the water cooler 6 by utilizing the latent heat generated when the liquid refrigerant is dispersed and vaporized. 8 and 9 are low-temperature heat exchangers; 8 and 9 are low-temperature heat exchangers; 8 and 9 are low-temperature heat exchangers; and a high-temperature heat exchanger, these include a refrigerant circuit 1 having a refrigerant vapor pipe 10, a refrigerant liquid down-flow pipe 11, and a refrigerant pump 12.
3. A dual-effect absorption refrigerator A is constructed by connecting a dilute liquid pipe 15, an intermediate liquid pipe 16, and a concentrated liquid pipe 17 with an absorption liquid pump 14.

18 is a generator that heats and separates the refrigerant from the dilute liquid using high-temperature water as a heat source; 19 is a condenser that uses a cooler 20 to condense and cool the refrigerant flowing from the generator 18; and 21 is a generator that uses high temperature water as a heat source to separate the refrigerant from the dilute liquid. The evaporator 23 is configured to obtain cold water for air conditioning from the water cooler 22 by utilizing the latent heat generated when the liquid refrigerant is sprayed and vaporized. an absorber capable of maintaining the inside of the evaporator 21 at a low pressure and continuously supplying cold water by scattering liquid and absorbing refrigerant vapor in the container;
24 is a heat exchanger, which includes a refrigerant vapor pipe 25, a refrigerant liquid downflow pipe 26, a refrigerant circulation path 28 having a refrigerant pump 27, and a dilute liquid pipe 30 having an absorption liquid pump 29.
A single-effect absorption refrigerator B is constructed by connecting the two through a concentrated liquid pipe 31.

The high-temperature generator 1 of the double-effect absorption refrigerator A and the generator 18 of the single-effect absorption refrigerator B are connected in series by a high-temperature water pipe 32, and the high-temperature generator 1
The high-temperature water three-way control valve 33 provided on the outlet side of the double-effect absorption chiller A controls the output of a temperature regulator 35 that receives a signal from the chilled water temperature detector 34 provided on the outlet side of the water cooler 6 of the dual-effect absorption refrigerator A. controlled by the generator 1
A high-temperature water three-way control valve 36 provided on the outlet side of the single-effect absorption chiller B supplies high-temperature water to a temperature controller 38 that receives a signal from a cold water temperature detector 37 provided on the outlet side of the water cooler 22 of the single-effect absorption chiller B. The temperature sensor 39 provided in the pipe 32 compensates for the control.

In the above configuration, when the high temperature generator 1 of the double-effect absorption chiller A is heated with high-temperature water of about 200°C, the temperature at the outlet side of the high-temperature water pipe 32, that is, the inlet side of the single-effect absorption chiller B, is about 150°C. The water becomes high temperature.

The high temperature water three-way control valve 33 is controlled by the cold water temperature detector 34 of the water cooler 6 of the dual effect absorption refrigerator A via the temperature regulator 35. In other words, when the temperature of the cold water obtained from the water cooler 34 is higher than the set value of 7°C, the temperature of the high-temperature water on the inlet side of the generator 18 is approximately 150°C, and the high-temperature water three-way control valve of the single-effect absorption chiller B 36 is controlled by the temperature of the cold water in the water cooler 22 in accordance with the schedule A in FIG. The temperature of the cold water obtained from this water cooler 22 is 7°C.
When the temperature drops below 150°C, the temperature of the high-temperature water on the inlet side of the generator 18 gradually rises above 150°C, and the temperature controller 38 is compensated by the temperature detector 39, resulting in a state close to the schedule shown in Fig. 2B. The opening degree of the high temperature water three-way control valve 36 is controlled.

As described above, the present invention connects the high-temperature generator of the double-effect absorption refrigerator and the generator of the single-effect absorption refrigerator in series, operates both absorption refrigerators with high-temperature water, and operates the single-effect absorption refrigerator. The amount of heat input to the generator is controlled by compensating the temperature at the cold water outlet of the single-effect absorption chiller with the temperature at the inlet of high-temperature water, so the thermal energy of the high-temperature water is effectively used, and the heat energy is Capacity control of single-layer absorption refrigerators can also be performed safely and smoothly.

[Brief explanation of the drawing]

FIG. 1 shows a single layer equipped with a control device according to the invention;
FIG. 2 is a block diagram of a dual-effect combination absorption refrigerator, and FIG. 2 is a control characteristic diagram of a single-effect absorption refrigerator. 1... High temperature generator, 18... Generator, 33,3
6... High temperature water three-way control valve, 34, 37... Cold water temperature detector, 35, 38... Temperature controller, 39...
Temperature detector.

Claims (1)

[Claims] 1. A high-temperature generator of a double-effect absorption refrigerator and a generator of a single-effect absorption refrigerator are connected in series, and both absorption refrigerators are operated with high-temperature water, and the amount of heat input to the generator of the single-effect absorption refrigerator is 1. A control device for an absorption chiller, characterized in that the cold water outlet temperature of the single-effect absorption chiller is controlled by compensating for the high temperature water inlet temperature.