JPH0718614B2 - Air-cooled absorption chiller / heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a refrigerant and a solution (absorbent) which are directly deheated by outside air in a condenser and an absorber, heated in a regenerator and separated in a separator. In particular, the present invention relates to an air-cooled absorption cold / hot water machine that is suitable for stable freezing operation by preventing high temperature deterioration of the solution and high pressure inside the machine when the outside air temperature is high.

[Conventional technology]

Conventionally, as shown in FIG. 4, the solution that has absorbed the refrigerant evaporated in the evaporator 5 is sent by the solution circulation pump 9, passes through the low temperature solution heat exchanger 8 and the high temperature solution heat exchanger 7, and The refrigerant vapor sent to the regenerator 1 is heated and separated in the separator 2, and the separated refrigerant vapor is condensed in the air-cooled condenser 4 via the low temperature regenerator 3 and the condensed refrigerant liquid is the refrigerant circulation pump.
It is sent by 10 and returns to the evaporator 5. On the other hand, the solution after separating the refrigerant in the separator 2 is heat-exchanged in the low-temperature regenerator 3 and the low-temperature solution heat exchanger 8 via the high-temperature solution heat exchanger 7, and then cooled by the outside air sucked by the cooling fan 20. In the air-cooled absorption chiller / heater that returns to the air-cooled absorber 6, the temperature sensor 16 or the temperature sensor 16 or The control was such that the pressure was detected by the pressure sensor 17 and the air-cooled absorption water heater was stopped at that time. In order to continue the operation even at a high outside air temperature, it was necessary to increase the heat transfer area of the condenser and the absorber, enlarge the cooling fan, and reduce the temperature difference between the solution and the outside air temperature.

[Problems to be solved by the invention]

If the cold / hot water machine itself is stopped when the outside air temperature is high, it will not be possible to sell it in the high outside air temperature area, and it will not have commercial value in the most needed areas. There is a problem that increasing the heat area and increasing the size of the cooling fan to cope with the outside air temperature resistance causes an increase in initial cost.

It is an object of the present invention to provide an air-cooled absorption chiller-heater that can be continuously operated even in an area where the outside air temperature is high, has commercial value, and does not increase cost.

[Means for solving problems]

In order to achieve the above-mentioned object, according to the present invention, the solution that has absorbed the refrigerant evaporated in the evaporator is sent to the high temperature regenerator through the low temperature solution heat exchanger and the high temperature solution heat exchanger by the solution circulation pump, and the high temperature regeneration is performed. The solution heated in the reactor separates the refrigerant in the separator, the separated refrigerant vapor is heat-exchanged in the low temperature regenerator and condensed in the air-cooled condenser, and the condensed refrigerant liquid is sent by the refrigerant circulation pump and evaporated. In the air-cooled absorption chiller-heater, the solution in which the refrigerant has been separated in the separator returns to the air-cooled absorber after heat exchange in the low-temperature regenerator and low-temperature solution heat exchanger via the high-temperature solution heat exchanger. A solution flow rate control valve is provided in the solution pipe from, a fuel control valve is provided in the fuel pipe of the high temperature regenerator, and a medium liquid control valve is provided in the intermediate concentrated solution line from the high temperature solution heat exchanger.
A controller for controlling each of the medium liquid control valve, the fuel control valve, and the solution flow rate control valve in a direction to be squeezed based on signals of at least the temperature or the device pressure sensor that changes according to the rise of the outside air temperature. Is configured.

[Action]

According to the present invention, by providing the medium liquid control valve, the fuel control valve, and the solution flow rate control valve, the temperature of the outside air increases,
The fuel control valve is throttled by the output signal of the controller that has received the signal that at least one of the temperature sensor of the high temperature regenerator, the pressure sensor of the separator or the outside air temperature sensor has reached the set value. Decrease to Low. At this time, both the medium liquid control valve and the solution flow rate control valve are throttled to reduce the flow rate. Therefore, the temperature of the solution in the high temperature regenerator is lowered and the pressure of the separator is also lowered.

〔Example〕

 A reference example of the present invention will be described with reference to FIG.

As shown in FIG. 1, the low temperature dilute solution (absorbent) that has absorbed the refrigerant evaporated by receiving heat from the cold water 22 in the evaporator 5 is sent by the solution circulation pump 9 to the low temperature solution heat exchanger 8 and the high temperature solution. The high-temperature concentrated solution sent to the high-temperature regenerator 1 via the solution heat exchanger 7 and heated in the high-temperature regenerator 1 is separated into the refrigerant in the separator 2, and the separated refrigerant vapor is cooled in the low-temperature regenerator 3. And is condensed in the air-cooled condenser 4, and the condensed refrigerant liquid is sent by the refrigerant circulation pump 10 and returns to the evaporator 5. On the other hand, the solution obtained by separating the refrigerant in the separator 2 is heat-exchanged in the low temperature regenerator 3 and the low temperature solution heat exchanger 8 via the high temperature solution heat exchanger 7, and then the refrigerant is absorbed by the outside air from the cooling fan 20. In the air-cooled absorption chiller-heater that returns to the air-cooled absorber 6 in which the absorption heat during cooling is cooled, the refrigerant vapor switching valve on the bypass passage 33 in which the refrigerant vapor from the separator 2 bypasses the low-temperature regenerator 3
30, a solution switching valve 31 on the solution bypass passage 34 for bypassing the solution from the separator 2 to the high temperature solution heat exchanger 7 and the low temperature regenerator 3, and a solution flow control valve to the solution pipeline 35 from the evaporator 5.
32 and each valve is configured to be controlled by a temperature or pressure setpoint.

Next, the operation of this reference example will be described.

Temperature sensor 1 of high temperature regenerator 1 due to rise in outside air temperature
6, pressure sensor 17 of separator 2 or outside air temperature sensor 18
In response to the output signal of the controller 19 that the sensor signal of at least one of the three parts has reached the specified value, the refrigerant vapor switching valve 30 of the three-way valve, the solution switching valve 31 of the three-way valve, and the solution flow control valve 32
The refrigerant vapor generated in the separator 2 does not go to the low temperature regenerator 3 but is directly guided to the air-cooled condenser 4, so that the pressure of the separator 2 decreases and the solution temperature of the high temperature regenerator 1 also decreases. To do. At this time, the solution from which the refrigerant has been separated in the separator 2 is directly guided to the low temperature solution heat exchanger 8 by the solution switching valve 31, bypasses the high temperature solution heat exchanger 7 and the low temperature regenerator 3, and simultaneously controls the solution flow rate. The valve 32 is also switched to single effect. As a result, a single-effect cycle consisting of one generator and one solution heat exchanger is formed, and the high temperature and high pressure problems at high outside air temperatures are eliminated.

A first embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 2, the solution flow rate control valve 32 is provided in the solution line 35 from the evaporator 5, the fuel control valve 21 is controlled to High and Low in the fuel line, and the intermediate concentrated solution line 22 is provided in the middle. A medium liquid control valve 36 for controlling the concentrated solution is provided.

The operation of the present embodiment is that the fuel control valve 21 is controlled by the output signal of the controller 19 which receives the signal that the signal from each sensor has reached the specified value due to the rise of the outside air temperature, and the fuel is high.
To low. At this time, both the solution flow rate control valve 32 and the medium solution control valve 36 are controlled to reduce the flow rate corresponding to the output signal. Here, since the heat transfer areas of the condenser and the absorber are excessive with respect to the flow rate, the solution temperature in the high temperature regenerator is lowered and the pressure in the separator is also lowered.

A reference example of the present invention will be described with reference to FIG.

Cooling fan 20 for cooling air-cooled condenser 4 and air-cooled absorber 6
The rotation speed of is controlled by the output signal of the controller 19.

In the operation of this reference example, the rotation speed of the cooling fan 20 is controlled to be increased by the output signal of the controller 19 which receives the signal from each sensor due to the rise in the outside air temperature. This increases the cooling capacity of the air-cooled condenser 4 and the air-cooled absorber 6,
The temperature of the solution in the high temperature regenerator 1 drops, and the pressure in the separator 2 also drops.

〔The invention's effect〕

According to the present invention, the solution flow control valve is provided in the solution pipe, the fuel control valve is provided in the fuel pipe of the high temperature regenerator, and the medium liquid control valve is provided in the intermediate concentrated solution pipe, and the medium liquid control valve and the fuel control valve are provided. Since the solution flow control valve is controlled by the temperature or pressure set value, double-effect operation can be continued, and operation that prevents a decrease in efficiency is possible. This has the effect of preventing such defects and ensuring the cooling capacity, while preventing an increase in the heat transfer area of the condenser and the absorber and an increase in the size of the cooling fan, which is economical.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a reference example of the present invention, FIG. 2 is a circuit diagram showing a first embodiment of the present invention, FIG. 3 is a circuit diagram showing a reference example of the present invention, and FIG. It is a circuit diagram which shows a technique. 1 ... high temperature regenerator, 2 ... separator, 3 ... low temperature regenerator,
4 ... Air-cooled condenser, 5 ... Evaporator, 6 ... Air-cooled absorber,
7: High temperature solution heat exchanger, 8: Low temperature solution heat exchanger, 9
...... Solution circulation pump, 10 …… Refrigerant circulation pump, 30 …… Refrigerant vapor switching valve, 31 …… Solution switching valve, 32 …… Solution flow control valve.

Claims (1)

[Claims] 1. A solution which has absorbed a refrigerant evaporated in an evaporator is sent to a high temperature regenerator via a low temperature solution heat exchanger and a high temperature solution heat exchanger by a solution circulation pump and heated by the high temperature regenerator. Refrigerant is separated from the solution by a separator, the separated refrigerant vapor is heat-exchanged by a low temperature regenerator and condensed by an air-cooled condenser, and the condensed refrigerant liquid is sent by a refrigerant circulation pump and returned to the evaporator. In the air-cooled absorption cold / hot water machine, the solution in which the refrigerant is separated in the separator returns to the air-cooled absorber by heat exchange in the low-temperature regenerator and the low-temperature solution heat exchanger via the high-temperature solution heat exchanger, A solution flow control valve is provided in the solution pipe from the evaporator, a fuel control valve is provided in the fuel pipe of the high temperature regenerator, and a medium liquid control valve is provided in the intermediate concentrated solution pipe from the high temperature solution heat exchanger. At least temperature or equipment that changes in response to rising temperature Based on each of the sensor signals of the force, it said in liquid control valve, the fuel control valve and the solution flow rate air absorption chiller which is characterized by comprising a controller for controlling the direction to narrow the respective control valve.