JPH0353549B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a refrigerating cycle by connecting a regenerator, a condenser, an evaporator, an absorber, a solution heat exchanger, etc. that are heated by exhaust gas generated from an industrial furnace, etc. This invention relates to an improvement of a control device for an absorption chiller/heater in which a water heater and a radiator are attached to a regenerator.

In this type of absorption chiller/heater, priority is given to the continued operation of equipment such as industrial furnaces, and there are restrictions on adjusting the amount of heating to the regenerator according to the chilled/hot water load, or in other words, regulating the exhaust gas. There is a problem that it is difficult to use the system effectively according to the load.

In view of this, the present invention adjusts the refrigerant flow rate utilized for the refrigeration cycle to increase or decrease in accordance with an increase or decrease in the chilled water load, while decreasing or increasing the refrigerant flow rate utilized for hot water heating when chilled water is primarily required. , and adjust the refrigerant flow rate to the radiator to decrease or increase according to the increase or decrease in the hot water load, and when hot water is mainly required, decrease or increase the refrigerant flow rate used in the refrigeration cycle according to the increase or decrease in the hot water load. On the other hand, the flow rate of refrigerant used for hot water heating is adjusted to increase or decrease.
In addition, by adopting a configuration that adjusts the flow rate of refrigerant to the radiator to decrease or increase according to an increase or decrease in the chilled water load, exhaust gas energy can be used effectively and the mainly required chilled water or hot water can be obtained according to the load while the secondary The purpose is to obtain hot or cold water depending on the load.

Embodiments of the present invention will be described below based on the drawings.
In Fig. 1, 1 is a combustion exhaust gas exhaust heat pipe 2, 2...
3 is a high-temperature regenerator that heats and separates the refrigerant from the dilute liquid and concentrates it into an intermediate liquid, and 3 a low-temperature regenerator that further heats and separates the refrigerant from the intermediate liquid and concentrates it into a concentrated liquid using the heat of the refrigerant vapor from the high-temperature regenerator. Regenerator 4 is both the regenerators 1 and 3
5 is an evaporator that obtains cold water for air conditioning by using the latent heat when the liquid refrigerant from the condenser is dispersed and vaporized; 6 is a condenser that condenses and cools the refrigerant from the low-temperature regenerator 3; The absorber 7 and 8 are heat exchangers for low temperature and high temperature solutions, which keep the inside of the evaporator 5 at a low pressure and continuously supply cold water by scattering concentrated liquid and absorbing the vaporized refrigerant inside the vessel. In a vessel,
These include a refrigerant conduit 9, a refrigerant liquid down-flow pipe 10, a refrigerant circuit 12 with a refrigerant pump 11, and a solution pump 1.
3, which are connected by a dilute liquid pipe 14, an intermediate liquid pipe 15, and a concentrated liquid pipe 16 to constitute a refrigeration cycle.

Reference numerals 17 and 18 denote a water heater and a radiator attached to the high-temperature regenerator 1, which are connected at their upper portions to branch pipes 19 and 20 of the refrigerant conduit 9, respectively, and whose lower portions are connected to the high-temperature regenerator 1. It is connected to a return pipe 21 and a refrigerant drain pipe 22. MV1, MV2, and MV3 are refrigerant control valves, refrigerant liquid control valves, and drain control valves disposed in the refrigerant conduit 9, refrigerant liquid return pipe 21, and refrigerant drain pipe 22, respectively.

23 is a cold water pipe housed in the evaporator 5; 24 is a cooling water pipe housed in the absorber 6 and condenser 4; 25 is a hot water pipe housed in the water heater 17; 26 is a cooling water pipe housed in the radiator 18; Pipe 23 and hot water pipe 25
Temperature detectors DT1 and DT2 are respectively installed in the two. In addition, CH1 and CH2 are temperature controllers, CMP
1 and CMP2 are potentiometers, S1, S2
and S3 are main control changeover switches.

Next, the control operation of the embodiment of the present invention will be explained. When cold water is mainly required, such as during summer, the main control changeover switches S1, S2, and S3 are connected to the C contacts, and the temperature controller CH1 and potentiometer CMP1 are controlled by the signal from the cold water temperature detector DT1.
As shown in Figure 2, the refrigerant control valve MV
The opening of the refrigerant liquid control valve MV2 is proportionally controlled so as to increase or decrease the opening of the refrigerant liquid control valve MV2 in accordance with an increase or decrease in the chilled water load (rise or fall of the chilled water outlet temperature), and the hot water temperature detector Temperature controller CH2 and potentiometer CMP are controlled by the signal from DT2.
2 through the drain control valve as shown in FIG.
The opening degree of MV3 is proportionally controlled so as to decrease or increase in accordance with the increase or decrease in hot water load (decrease in hot water outlet temperature).

In addition, when hot water is mainly required such as during winter,
The main control changeover switches S1, S2, and S3 are connected to the H contact, and the temperature controller CH2 and potentiometer CMP are switched by the signal from the hot water temperature detector DT2.
2 through the refrigerant liquid control valve as shown in FIG.
The opening degree of MV2 is proportionally controlled to increase or decrease according to the increase or decrease in hot water load (decrease in hot water outlet temperature), and the opening degree of refrigerant control valve MV1 is proportionally controlled to decrease or increase, and the chilled water temperature detector Temperature controller CH1 and potentiometer CMP are controlled by the signal from DT1.
1 through the drain control valve as shown in FIG.
The opening degree of MV3 is proportionally controlled so as to decrease or increase in accordance with the increase or decrease in the chilled water load (increase or decrease in the chilled water outlet temperature).

By controlling in this manner, when chilled water is mainly required, such as in the summer, the refrigerant generated by the exhaust gas energy in the high temperature regenerator 1 is preferentially used in the refrigeration cycle in an amount corresponding to the chilled water load. , on the other hand, the heat energy of the refrigerant that is not utilized in the refrigeration cycle, in other words, the exhaust gas energy that is not used to obtain chilled water.
As a result of adjusting the amount discharged outside the machine in step 8 according to the hot water load, so to speak, the exhaust gas energy is first provided to the main cold water load side, and then to the secondary hot water load side. The exhaust gas energy is controlled so that it is dissipated, and while making effective use of the exhaust gas energy, it is possible to obtain cold water at a predetermined temperature according to the load, as well as hot water. In this case, the exhaust gas energy is first supplied to the main hot water load, and then to the secondary cold water load, and then the excess energy is controlled so as to be radiated, making effective use of the exhaust gas energy. At the same time, hot water at a predetermined temperature depending on the load can be obtained, and cold water can also be obtained.

Incidentally, instead of disposing a drain control valve MV3 in the refrigerant drain pipe 22 and controlling the opening degree of the control valve to adjust the amount of heat radiation, although not shown, a drain control valve MV3 is installed in the cooling water pipe 26 housed in the radiator 18 A bypass pipe may be provided via a control valve (for example, a three-way valve), and the amount of heat radiation may be adjusted by controlling the opening degree of the control valve and adjusting the flow rate of cooling water to the radiator 18. Furthermore, when the cold water evaporator 5 outlet temperature falls below 5°C, the temperature controller is activated by the signal from the cold water temperature detector DT1.
The operation of the refrigerant pump 11 may be controlled to be stopped via CH1.

As described above, the present invention adjusts the amount of refrigerant generated by exhaust gas energy to be used on the main load side in proportion to the load, while at the same time adjusting the amount of refrigerant generated from the exhaust gas energy supplied to the regenerator to the main load side. The amount of heat radiated from the radiator is adjusted so that the amount of heat obtained by subtracting the amount of heat from the refrigerant used in the radiator is supplied to the secondary load in an amount commensurate with the load.
It is practically useful because it is possible to obtain hot and cold water according to each load while effectively utilizing exhaust gas energy.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the circuit configuration of an embodiment of the present invention;
FIG. 2 A, B, C and FIG. 3 A, B, C are diagrams showing examples of opening degree control of each control valve. 1... High temperature regenerator, 4... Condenser, 5... Evaporator, 6... Absorber, 7, 8... Low and high temperature solution heat exchanger, 9... Refrigerant conduit, 17... Water heater, 1
8...Radiator, 21...Refrigerant liquid return pipe, 22...
Refrigerant drain pipe, MV1... Refrigerant control valve, MV2...
...Refrigerant liquid control valve, MV3...Drain control valve, DT
1, DT2... Temperature detector, CH1, CH2... Temperature controller, S1, S2, S3... Main control changeover switch, CMP1, CMP2... Potentiometer.

Claims (1)

[Claims] 1. In an absorption chiller/heater in which a regenerator heated by exhaust gas, a condenser, an evaporator, an absorber, a solution heat exchanger, etc. are connected to form a refrigeration cycle, and the regenerator is attached to a water heater and a radiator. , a refrigerant control valve installed in the refrigerant conduit leading from the regenerator to the condenser, a refrigerant liquid control valve installed in the refrigerant return pipe leading from the water heater to the regenerator, and a refrigerant liquid control valve installed in the refrigerant drain pipe leading from the radiator to the regenerator. a cold water temperature sensor that detects the temperature of cold water from the evaporator, a hot water temperature sensor that detects the temperature of hot water from the water heater, and a signal based on the temperature detected by the cold water temperature sensor during cooling-based operation. A signal based on the temperature detected by the hot water temperature detector is relayed to the refrigerant control valve during heating-based operation, and a signal based on the temperature detected by the chilled water temperature sensor during cooling-based operation. is relayed to the refrigerant liquid control valve.During heating-based operation, the switch provides a signal based on the temperature detected by the hot water temperature detector to the refrigerant liquid control valve.During cooling-based operation, a signal based on the temperature detected by the hot water temperature detector is sent to the refrigerant liquid control valve. A control device for an absorption chiller/heater, characterized in that it is equipped with a switching switch that relays a signal based on the temperature detected by a chilled water temperature detector and supplies it to the drain control valve during heating-based operation.