JPS6246790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption refrigerating machine, and more particularly to an absorption refrigerating machine that switches between cooling operation and heat pump operation that simultaneously performs cooling and heating operations.

Referring to FIG. 1 showing a conventional dual-effect absorption refrigerator, the double-effect absorption refrigerator includes a high temperature regenerator 1, a low temperature regenerator 2, a condenser 3, an evaporator 4, an absorber 5, etc. It is composed of. When this dual-effect absorption refrigerator is operated with a heat pump, the amount of heat is pumped up from the water flowing through the coil 7 in the evaporator 4, and the water flowing through the coil 8 in the condenser 3 and absorber 5 is heated. . Therefore, cold water is obtained from the coil 7 and hot water is obtained from the coil 8.
During such heat pump operation, in order to prevent the chilled water temperature from changing due to fluctuations in the load using the chilled water, conventionally, the chilled water temperature is detected by a temperature detector 6 and controlled by a temperature controller 9. The heating amount of the high temperature regenerator 1 was adjusted by adjusting the opening degree of the control valve 10. As a result, the temperature of the hot water obtained from the coil 8 decreased as the cold water load became small, and increased as the cold water load became large, regardless of the hot water load. Therefore, in the past, it was necessary to separately provide a heat source for adjusting the temperature of the hot water obtained from the coil 8.

An object of the present invention is to solve the above-mentioned technical problems and provide an absorption refrigerator that can obtain hot water at a temperature that corresponds to the hot water load during heat pump operation.

The present invention provides an absorption refrigerating machine used in an air-conditioning apparatus that has an air conditioner 19 that is supplied with a cooling fluid to perform air conditioning, and a heater 25 that is supplied with a heating fluid and that performs heating. The temperature of the refrigerant in the evaporator 14 or the outlet of the cooling fluid cooled by the evaporator 14 is detected by first temperature detectors 28 and 29; As the heated temperature decreases, more of the heating fluid heated in the absorber 15 and condenser 13 bypasses the absorber 15 and flows into the condenser 13.
The cooling fluid is circulated to the air conditioner 19, and the temperature at the outlet of the heating fluid heated by the condenser 13 is detected by the second temperature detector 31. This absorption refrigerator is characterized in that as the temperature detected by the temperature detector 31 decreases, the heating amount of the regenerator 11 is increased and the heating fluid is circulated to the heater 25.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a system diagram of an embodiment of the present invention,
Indicates the heat pump operating status. This dual-effect absorption refrigerator, like the conventional one shown in FIG. It includes a heat exchanger 17. A coil 18 in the evaporator 14 is connected to a cooler 19 via pipes 20, 21, thereby forming a cold water circulation circuit.
The coils 22 of the condenser 13 and the absorber 15 are connected via lines 23, 24 to a heater 25, thereby forming a hot water circulation circuit.

A three-way valve 26 is provided in the middle of the conduit 24. One end of the bypass pipe 27 is connected to the remaining connection end of the three-way valve 26, and the bypass pipe 27 is connected to one end of the bypass pipe 27.
The other end of 7 is connected to the middle of coil 22 . A temperature detector 28 is provided in the middle of the pipe line 21 connected to the coil 18 of the evaporator 14 . The three-way valve 26 is controlled via the temperature regulator 30 in response to the signal from the temperature sensor 28, and when the temperature of the cold water detected by the temperature sensor 28 decreases, the three-way valve 26
6 is controlled so that the flow rate to the bypass pipe line 27 is large. In place of this temperature detector 28, a temperature detector 2 that detects the temperature of the refrigerant in the evaporator 14
9 may be provided. A temperature detector 31 is provided in the middle of the pipe line 23. A control valve 34 is provided in the middle of a pipe line 33 that supplies high-temperature steam or fuel into the high-temperature regenerator 11 . Regulating valve 34 is controlled by temperature regulator 32 which is responsive to the signal of temperature sensor 31 .

During heat pump operation, when the load on the air conditioner 19 fluctuates and becomes smaller, and the temperature of the cold water in the pipe line 21 or the refrigerant in the evaporator 14 decreases accordingly,
The flow rate of hot water flowing through the bypass pipe line 27 becomes large. Therefore, the temperature inside the absorber 15 rises, and the solution temperature inside the absorber 15 rises. Therefore, the absorption capacity of the solution is reduced and the temperature of the cold water is controlled. Furthermore, when the temperature of the hot water flowing through the pipe line 23 decreases, the opening degree of the control valve 34 is increased, thereby increasing the heating amount of the high temperature regenerator 11, and therefore the hot water obtained by the coil 22 is increased. temperature can be increased.

As the heating amount of the high-temperature regenerator 11 increases, the amount of evaporation of the refrigerant in the high-temperature regenerator 11 increases, and the concentration of the solution flowing into the absorber 15 increases, so that the cooling capacity of the coil 18 increases. increase At this time, if the load on the air conditioner 19 is small, the temperatures of the cold water and the refrigerant decrease. The temperature of this cold water or refrigerant is measured by a temperature sensor 28 or 29.
The three-way valve 26 increases the flow rate of hot water to the bypass pipe 27 as the temperature decreases.
is controlled. Thereby, the temperature of the solution in the absorber 15 increases and the absorption capacity is restored. As a result, the cold water and refrigerant temperatures are prevented from dropping too much, and cold water and hot water can be obtained at temperatures corresponding to the loads of the air conditioner 19 and the heater 25, respectively.

In the above embodiment, the negative liquid of the heater 25 is connected to the cooler 1.
This method is effective when the load amount is larger than the load amount corresponding to 9, but when the load on the heater 25 is smaller than the load amount, it is possible to switch to the conventional operating method shown in FIG. can. That is, high temperature regenerator 1
A temperature detector 6 is provided to detect the temperature of cold water obtained from the evaporator 4, and a control valve 10 is activated via a temperature controller 9 in response to a signal from the temperature detector 6. Just control it.

Therefore, when the load on the air conditioner 19 becomes large and the cold water temperature rises too much, the conventional control method shown in FIG. If it is too long, the control method of the present invention shown in FIG. 2 can be used.

The invention is not limited to the dual-effect absorption refrigerators described above, but can also be implemented in conjunction with single-effect absorption refrigerators.

As described above, according to the present invention, the temperature at the outlet of the refrigerant in the evaporator 14 or the cooling fluid cooled by the evaporator 14 is detected by the first temperature detectors 28 and 29, and this temperature is detected by the first temperature detectors 28 and 29. As the temperature decreases, the flow rate of the heating fluid that bypasses the absorber 15 is increased, so even if the temperature in the regenerators 11 and 12 rises and the absorption capacity in the absorber 15 decreases,
The temperature within the absorber 15 increases and its absorption capacity can be restored. Therefore, the temperatures of the cooling fluid and the heating fluid, which serve as cooling and heating heat sources, can be controlled in accordance with the loads on the air conditioner 19 and the heater 25.

Furthermore, according to the present invention, the second temperature detector 31 detects the temperature of the heating fluid heated sequentially in the absorber 15 and the condenser 13 at the outlet from the condenser 13, and the temperature decreases. Since the heating amount of the regenerator 11 is increased accordingly, the temperature of the heating fluid can be increased.

Furthermore, according to the present invention, increasing the heating amount of the regenerator 11 results in a decrease in the temperature of the cooling fluid. Therefore, as described above, the flow rate of the heating fluid that bypasses the absorber 15 increases, thereby allowing the absorption capacity in the absorber 15 to be restored. In this way, an excellent effect is achieved in that the cooling fluid can be successfully prevented from dropping too low.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional dual-effect absorption refrigerating machine, and FIG. 2 is a system diagram of a dual-effect absorption refrigerating machine according to an embodiment of the present invention. 11...High temperature regenerator, 12...Low temperature regenerator, 1
3... Condenser, 14... Evaporator, 15... Absorber, 19... Air conditioner, 25... Heater, 26...
Three-way valve, 27... Bypass pipeline, 28, 29, 3
1... Temperature detector, 30, 32... Temperature regulator.

Claims (1)

[Scope of Claims] 1. In an absorption chiller used in an air-conditioning device, which has an air conditioner 19 that performs air conditioning by being supplied with a cooling fluid, and a heater 25 that performs heating by being supplied with a heating fluid, a heat pump is provided. During operation, the temperature of the refrigerant in the evaporator 14 or the outlet of the cooling fluid cooled by the evaporator 14 is detected by the first temperature detectors 28, 29; Thus, as the detected temperature decreases, more of the heating fluid heated in the absorber 15 and condenser 13 bypasses the absorber 15 and flows into the condenser 13.
The cooling fluid is circulated to the air conditioner 19, and the temperature at the outlet of the heating fluid heated by the condenser 13 is detected by the second temperature detector 31. An absorption refrigerator characterized in that as the temperature detected by the temperature detector 31 decreases, the heating amount of the regenerator 11 is increased, and the heating fluid is circulated to the heater 25.