JPH0446341B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to switching control of heating and cooling in an air-cooled dual-effect absorption chiller/heater.

[Prior art]

Conventional known technology includes a water-cooled dual-effect absorption chiller-heater that cools the condenser and absorber with cooling water, and the circulation system for cooling operation that obtains chilled water by evaporating liquid refrigerant in an evaporator is separated for heating operation. Open the heating and cooling switching valve that connects the evaporator and the evaporator with piping to allow refrigerant vapor to flow into the evaporator, and use the evaporator's heat exchanger as a water heater, thereby creating a heat exchanger for cooling and heating. There was a configuration that didn't need to have each.

Furthermore, as an air-cooled dual-effect absorption chiller-heater, there was a water-cooler/heater as shown in FIG. 3, which was modified from the water-cooled dual-effect absorption chiller/heater to be compatible with air cooling.
This has a high-temperature regenerator 1' that heats a dilute solution that has absorbed refrigerant, and heats the intermediate concentrated solution, which is separated into refrigerant vapor and intermediate concentrated solution in a separator 2', using the heat of condensation of the refrigerant vapor. The refrigerant from the low-temperature regenerator is condensed in a condenser 6', the condensed liquid refrigerant is evaporated in an evaporator 7' to produce cold water, and the evaporated refrigerant vapor is There was an air-cooled dual-effect absorption chiller-heater configured to absorb a concentrated solution from the low-temperature regenerator 4' in an absorber 8' and pump this dilute solution to the high-temperature regenerator 1' with a pump 9'. In the heating operation, the water chiller/hot water machine opens the air conditioning/heating switching valve 17' which connects the separator 2' and the evaporator 7' with hot water to the heat exchanger of the evaporator 7' used for the cooling operation. It was used as a vessel.

There was also a hot and cold water machine as shown in Figure 4. This has a built-in water heater 11' and a dedicated heat source 10' for heating the water heater in addition to the evaporator used during cooling operation, and the three-way valve 12' is set to the A flow path and The configuration was such that the flow path was switched to the B flow path during cooling.

[Problems to be solved by the invention]

However, as shown in FIG. 3, if the heat exchanger of the evaporator 7' is used for both cooling and heating, and the condenser 6' and absorber 8' are configured to be air-cooled and efficiently exchange heat with the air, During heating operation,
Natural heat dissipation into the air by the condenser 6' and absorber 8' resulted in a drastic reduction in their heating capacity.

Therefore, in the past, in addition to the evaporator 7' used during the cooling operation shown in FIG.
As shown in the figure, the water heater has a built-in structure including a water heater 11' and a dedicated heat source 10' for heating the water heater.

However, in this case, in addition to the heat source device that heats the high-temperature regenerator during cooling operation, the water heater 11' during heating operation is
This requires a heat source device 10' for heating the water heater, which complicates control, and furthermore, requires two heat source devices, which increases costs and is inconvenient.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an air-cooled dual-effect absorption chiller/heater that can perform cooling and heating operations with a single heat source device and can easily switch between cooling and heating.

[Means for solving problems]

The present invention provides a high-temperature regenerator that heats a dilute solution that has absorbed a refrigerant to obtain refrigerant vapor and an intermediate concentrated solution, a separator that separates the refrigerant vapor and the intermediate concentrated solution, and a separator that separates the intermediate concentrated solution. a low-temperature regenerator that is heated by the refrigerant vapor that is introduced after its temperature has been lowered in a high-temperature heat exchanger; a condenser that condenses the refrigerant from the low-temperature regenerator by air cooling; and a condenser that evaporates the liquid refrigerant condensed in the condenser. an evaporator that exchanges heat with the load chilled water; an absorber that absorbs the refrigerant vapor evaporated in the evaporator into a concentrated solution from the low-temperature regenerator; and removes the absorbed heat generated at this time by air cooling; A pump for pumping the diluted solution to the high-temperature regenerator, these form a circulation system, and the heat exchanger of the evaporator in this circulation system generates cold water, and the water heater in the separator generates refrigerant. In an air-cooled dual-effect absorption chiller-heater in which hot water is generated by condensing steam, and the generated cold water or hot water is switched by a valve in a cold/hot water flow path, the separation is carried out in a pipe that supplies an intermediate concentrated solution to the low temperature regenerator. An intermediate concentrated solution flow control valve that opens and closes based on the pressure difference between the separator and the condenser, and a pipe that supplies the liquid refrigerant that has undergone heat exchange and condensed in the low-temperature regenerator to the condenser, opens and closes based on the pressure difference between the separator and the condenser. This is an air-cooled dual-effect absorption chiller/heater characterized by being equipped with a refrigerant flow rate control valve.

The following will be explained with reference to the drawings. As shown in Fig. 1, 1 is a high-temperature regenerator that heats a dilute solution that has absorbed refrigerant to obtain refrigerant vapor and an intermediate concentrated solution; 2 is a high-temperature regenerator that generates refrigerant vapor and an intermediate concentrated solution; A separator for separating, 3 is a high-temperature heat exchanger, 4 is a refrigerant vapor separated in the separator 2, heat exchanges with a low-temperature dilute solution in the high-temperature heat exchanger 3, and heats the intermediate concentrated solution whose temperature is lowered. a low-temperature regenerator for obtaining steam and a concentrated solution, 5 a low-temperature heat exchanger, 6 a condenser for condensing and cooling the refrigerant vapor and refrigerant liquid generated in the low-temperature regenerator 4 and the high-temperature regenerator 1 and condensed in the low-temperature regenerator; 8 is an evaporator that evaporates the refrigerant liquid condensed in the condenser 6 and exchanges heat with the load chilled water; 9 is a solution pump that pumps the dilute solution from the absorber 8 to the high-temperature regenerator 1. Forming a circulation system of an absorption chiller/heater, cold water is generated by the heat exchanger of the evaporator 7, and refrigerant vapor generated from the high temperature regenerator 1 is condensed in the water heater 11 included in the separator 2 to generate hot water. A three-way valve 12 is provided in the cold and hot water circulation system flow path between the evaporator 7 and the water heater 11, and is provided in front of the three-way valve 12, and the generated cold and hot water is switched between cooling operation and heating operation. A cold/hot water circulation pump 13 is installed. Further, the pipe line 26 for supplying the intermediate concentrated solution to the low temperature regenerator 4 is provided with an intermediate concentrated solution flow rate control valve 14 having a complete closing function that automatically opens and closes depending on the pressure difference between the separator 2 and the condenser 6. , a refrigerant flow rate having a complete closing function that automatically opens and closes depending on the pressure difference between the separator 2 and the condenser 4 in a pipe 27 that supplies the liquid refrigerant condensed through heat exchange in the low-temperature regenerator 4 to the condenser 6. A control valve 15 is provided.

Therefore, the structures of the intermediate concentrated solution flow rate control valve 14 and the refrigerant flow rate control valve 15 will be explained with reference to FIG. Refrigerant flow control valve 15
is connected to the condenser 6, the pipe 21 is an inlet pipe, the intermediate concentrated solution flow rate control valve 14 connects the intermediate concentrated solution circuit 26 whose temperature has been lowered in the high temperature heat exchanger 3, and the refrigerant flow rate control valve 15 connects the intermediate concentrated solution circuit 26 with a low temperature It is connected to the liquid refrigerant circuit 27 condensed in the regenerator 4, and the pipe line 22 is connected to the condenser 6 together with the intermediate concentrated solution flow rate control valve and the refrigerant flow rate control valve. Then, the on-off valve 23 attached to the diaphragm 24 that automatically opens and closes the flow path from the inlet pipe 21 due to the pressure difference between the outlet pipe 20 and the pipe line 22 connected to the condenser 6 is connected to the valve at the end of the outlet pipe 20. A spring 25 is provided on the back of the diaphragm 24 to adjust the opening/closing pressure so as to provide a complete closing function.

In addition, in the figure, 10 is a heat source device that heats the high-temperature regenerator 1, and generally a burner that burns fuel is used. 16 is an air-cooled cooling fan for releasing into the air the heat of condensation of the refrigerant in the condenser 6 and the heat of absorption in the absorber 8 during cooling operation, and 18 is the low temperature heat exchanger 5 when the solution pump 9 is stopped. from absorber 8
19 is a solution bypass pipe through which the solution flows during heating.

[Effect]

Therefore, the intermediate concentrated solution flow rate control valve 14 and the refrigerant flow rate control valve 15 have a valve 23 that opens and closes the flow from the inlet pipe 21 to the outlet pipe 20, and the opening and closing of the valves is the same as that of the pipe connected to the condenser 6. Since it is constructed based on the pressure difference between the air-cooled water heater and the water heater 21, the operation of the air-cooled dual-effect absorption chiller-heater is that during heating operation, the three-way valve 12 is turned in the direction of the arrow A so that hot water flows to the water heater 11. Controlled, the hot water outlet temperature is adjusted to 50℃~60℃. At this time, the pressure in separator 2 is approximately 100 to 160 mm.
It becomes HgAbs. Therefore, the pressure when the intermediate concentrated solution flow rate control valve 14 and the refrigerant flow rate control valve 15 are opened is
By setting 200 to 250 mmHgAb ₂ , the solution and refrigerant vapor heated in the high-temperature regenerator 1 do not flow into the low-temperature regenerator 4 and condenser 6, so efficient heating operation is possible.

Next, during cooling operation, the three-way valve 12 is controlled so that cold water flows through the evaporator 7 as indicated by the arrow B.
The operation will be similar to normal dual-effect absorption chiller operation. Here, the pressure of separator 2 is the cooling air temperature between 20℃ and 35℃.
℃, it becomes 500 to 1500 mmHgAbs, and the intermediate concentrated solution flow rate control valve 14 and the refrigerant flow rate control valve 15 are in an open state.

It goes without saying that the intermediate concentrated solution flow rate control valve 14 and the refrigerant flow rate control valve 15 can be handled by electromagnetic valves or modular valves operated by other cooling/heating control signals rather than the differential pressure valve system, and also by switching the cold and hot water flow paths. The valve for this purpose is not only a three-way valve, but also a combination of two-way valves or a manual valve.

〔Effect of the invention〕

As a result of the above, the present invention provides the following effects.

Cooling and heating operations can be performed with a single heat source device, reducing costs.

Switching between cooling and heating is easy, just by switching the circulating water system for cold and hot water.

Since both the intermediate concentrated solution flow rate control valve and the refrigerant flow rate control valve are simple self-pressure automatic control valves, a special control mechanism such as a solenoid valve mechanism or a modular valve mechanism is not required, and the control is inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of an air-cooled dual-effect absorption chiller-heater of the present invention, and FIG. 2 is a structural diagram of an intermediate concentrated solution flow rate control valve and a refrigerant flow rate control valve. FIG. 3 is a block diagram of a conventional air-cooled dual-effect absorption chiller/heater, and FIG. 4 is a block diagram of another embodiment of the conventional air-cooled dual-effect absorption chiller/heater. 1, 1'... High temperature regenerator, 2, 2'... Separator,
3,3'...High temperature heat exchanger, 4,4'...Low temperature regenerator, 5,5'...Low temperature heat exchanger, 6,6'...Condenser, 7,7'...Evaporator, 8,8'...absorber,
9,9'...Solution pump, 10,10'...Heat source device, 11,11'...Water heater, 12,12'...Three-way valve, 13,13'...Circulating water pump, 14,1
4'... Intermediate concentrated solution flow rate control valve, 15, 15'...
Refrigerant flow control valve, 16, 16'... Air cooling cooling fan, 17, 17'... Air conditioning switching valve, 18, 1
8'... Check valve, 19, 19'... Solution bypass pipe, 20... Outlet pipe, 21... Inlet pipe, 22...
Pipe line, 23... Valve to open and close, 24... Diaphragm, 25... Spring, 26... Intermediate concentrated solution circuit, 2
7...Refrigerant circuit.

Claims (1)

[Claims] 1 It has a high temperature regenerator 1 that heats a dilute solution that has absorbed a refrigerant, and the refrigerant vapor obtained by heating with the high temperature regenerator and an intermediate concentrated solution are separated in a separator 2, and the separated intermediate concentrated solution a low temperature regenerator 4 which is introduced after the temperature of the refrigerant has been lowered and heats the intermediate concentrated solution with the heat of condensation of the refrigerant vapor, a condenser 6 which condenses the refrigerant from the low temperature regenerator by air cooling; The evaporator 7 evaporates the condensed liquid refrigerant and exchanges heat with the load chilled water, and the refrigerant vapor evaporated in the evaporator is absorbed into the concentrated solution from the low-temperature regenerator 4, and the absorbed heat generated at this time is removed by air cooling. The evaporator 7 of the circulation system formed by these components generates cold water, and the separator 2 In an air-cooled dual-effect absorption chiller-heater, in which hot water is generated by condensing refrigerant vapor from a water heater 11 contained in the water heater 11, and the generated cold water or hot water is supplied by switching a valve in a cold/hot water flow path system, the low-temperature regenerator 4 Conduit 26 for supplying intermediate concentrated solution to
An intermediate concentrated solution flow rate control valve 14 that opens and closes depending on the pressure difference between the separator 2 and the condenser 6, and a pipe 27 that supplies the liquid refrigerant condensed through heat exchange in the low-temperature regenerator 4 to the condenser 6. An air-cooled dual-effect absorption chiller-heater characterized by being provided with a refrigerant flow control valve 15 that opens and closes depending on the pressure difference between the container 2 and the condenser 4.