JPH01134178A - Air-cooled absorption water cooler and heater - Google Patents

Abstract

PURPOSE: To prevent the deterioration at high temperature of absorbing solution and the pressure rise within the machine, by so arranging the constitution as to open/close the control valve in a pipe for coupling pipe between a refrigerant reservoir and the suction side of a refrigerant circulation pump when either the temperature of a regenerator or outside air or the pressure of a separator rises to a set value or higher. CONSTITUTION: When at least one of detection signals from temperature sensors 16 and 23 and a pressure sensor 18 with the temperature rise of outside air is sent to a controller 19, a control valve 22 is opened by the output signal from the controller 19. Whereupon, the refrigerant liquid collected in a refrigerant bank 21 is absorbed in a refrigerant circulation pump 15, and the concentration of absorbing solution drops. Moreover, when the temperature of the solution of a high-temperature regenerator 2 and the pressure of a separator 3 drops and the detection signals of the temperature sensor 16 and the pressure sensor 18 are inputted into the controller 19, the control valve 22 is closed by the output signal from the controller 19. In case that the ambient temperature goes up further, the operation is performed again, whereby the solution temperature of the reproducer 2 at high temperature and the pressure of the separator 3 drop.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an air-cooled absorption chiller/heater that cools and removes heat from a condenser and an absorber directly into the outside air.

[Conventional technology]

For example, in a conventional dual-effect air-cooled absorption chiller/heater, as shown in FIG. , detects the temperature or pressure and increases the rotation speed of the cooling fan 5 (cooling fan rotation speed control method), increases the cooling effect and prevents a rise in temperature or pressure, or reduces the combustion amount (combustion (quantity control system) to prevent the temperature or pressure from increasing.

In Fig. 3, 6 is a low-temperature regenerator, 8 is an air-cooled condenser, 9 is an evaporator, 10 is an air-cooled absorber, 11 is a high-temperature solution heat exchanger, 12 is a low-temperature solution heat exchanger, and 13 is a solution circulation pump. , 15 is a refrigerant circulation pump, 16 is a temperature sensor that detects the solution temperature in the high-temperature regenerator 2, 18 is a pressure sensor that detects the pressure in the separator 3, and 19 receives signals from each sensor and outputs control signals. The output controller 20 is a fuel control valve that controls the combustion amount in the high temperature regenerator 2.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, when the outside air temperature is actually high, the cooling load is large, so simply increasing the rotation speed of the cooling fan 5 will not increase the cooling effect. The amount of combustion cannot be expected because it is approximately 8 times as large, and the reduction in combustion amount is not expected due to the increase in the cooling fan 5 as shown in the case of 0 or more, where the cooling capacity decreases when the cooling load further increases and an increase in cooling capacity is required. Increasing the capacity alone has the problem that the cooling effect is low and the solution becomes high temperature, resulting in excessive defects for the absorption chiller/heater, such as deterioration of solution performance, consumption of the inhibitor, generation of non-condensable gas, and corrosion of steel materials. Ta. Furthermore, when the demand for cooling from users increases, there is a problem in that the commercial value decreases because the demand cannot be met.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air-cooled absorption chiller/heater that prevents deterioration of the absorbent solution at high temperatures and increases the pressure inside the machine when the outside air temperature becomes high.

[Means for solving problems]

To achieve this objective, the present invention provides a regenerator 1 separator, evaporator, high temperature solution heat exchanger, low temperature solution heat exchanger and air-cooled condenser directly cooled by air, air-cooled absorber, solution circulation pump and refrigerant. In an air-cooled absorption chiller-heating machine having a circulation pump and operatively connected to the air-cooled condenser and evaporator, the refrigerant liquid is a refrigerant reservoir for storing and adjusting the solution concentration; a control valve disposed in a pipe connecting the lower part of the refrigerant reservoir and the suction side of the refrigerant circulation pump; the temperature of the regenerator, and the pressure of the separator. , a controller that detects either the temperature of the outside air and controls the opening/closing of the control valve when either the temperature or the pressure exceeds a set value.

[Effect]

According to the above configuration, when at least one detection signal among the regenerator temperature, the separator pressure, and the outside air temperature is input to the controller when the outside air temperature rises, the output signal from the controller The control valve is controlled to open. Then, the refrigerant accumulated in the refrigerant reservoir is absorbed by the refrigerant circulation pump, the concentration of the absorption solution decreases, and the solution temperature in the regenerator and the pressure in the separator decrease.

〔Example〕

The present invention will be explained below based on the embodiment shown in FIG.

The air-cooled absorption chiller/heater 1 of the present invention differs from the conventional air-cooled absorption chiller/heater shown in FIG. 3 in that the refrigerant reservoir 21. The point is that an on-off valve 22 and a temperature sensor 23 are newly provided. The refrigerant reservoir 21 is arranged opposite to the air-cooled condenser 8,
The upper part of the refrigerant reservoir 21 is connected to the evaporator 9 by a pipe line 25. Further, the lower part is connected to the lowest part of the air-cooled condenser 8 by a pipe line 26, and the storage of the refrigerant liquid in the refrigerant reservoir 21 is naturally adjusted by the pressure difference between the evaporator 9 and the air-cooled condenser 8. The control valve 22 is, for example, a step-type control valve.

In other words, it is an ON-OFF operation valve, and the pipe line 28 connects the lower part of the refrigerant reservoir 21 and the suction part of the refrigerant circulation pump 15.
and is connected to the controller 19. The temperature sensor 23 is disposed in a space between the air-cooled condenser 8 and the refrigerant reservoir 21, and is configured to detect the temperature of the outside air and send a detection signal to the controller 19.

Next, the operation of the embodiment of the present invention will be explained.

Due to the rise in outside air temperature, at least one detection signal from the temperature sensors 16, 23 and the pressure sensor 18 is output to the controller 19.
When the signal is sent to the controller 19, the control valve 22 is controlled to open by the output signal from the controller 19. Then, the refrigerant liquid accumulated in the refrigerant reservoir 21 is absorbed by the refrigerant circulation pump 15, and as a result, the concentration of the absorbed solution decreases, and the solution temperature in the high temperature regenerator 2 and the pressure in the separator 3 decrease, and the temperature sensor Detection signals from the pressure sensor 16 and the pressure sensor 18 are input to the controller 19, and the output signal from the controller 19 causes the control valve 22 to be controlled to close. If the outside air temperature further rises, the solution temperature in the high temperature regenerator 2 and the pressure in the separator 3 are reduced by performing the above-described operation again.

In the above embodiment, the control valve 22 is a step-type opening/closing valve, but a proportional control valve whose opening degree operates proportionally according to an output signal from the controller 19 may also be used. In this case,
Since the opening changes proportionally depending on the signal from each sensor, the concentration of the solution can be controlled linearly instead of stepwise compared to a one-stage control valve. It is possible to maintain the cooling capacity of the machine with higher efficiency.

Figure 2 shows the relationship between outside air temperature and cooling capacity in the conventional combustion amount control method A, cooling fan rotation speed control method B, and the staged control valve control method C5 proportional control valve method of the present invention. , the cooling capacity at low outside temperature and the temperature at the inflection point are all the same, but when the outside temperature is higher than the inflection point,
It can be seen that in the case of the stepwise control valve control method C and the proportional control valve method D, especially in the case of the proportional control valve method, there is no sudden decrease in cooling capacity. This increases the efficiency of the air-cooled absorption chiller/heater.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent the pressure from increasing due to the rise in outside air temperature and from increasing the temperature of the absorption solution during the cooling operation of the air-cooled absorption chiller/heater, so that the cooling capacity required by the user is always maintained. can be secured. Furthermore, by controlling the control valve stepwise or proportionally, there is no sudden drop in cooling capacity, and operational efficiency is further improved.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an air-cooled absorption chiller/heater according to the present invention;
The figure is a diagram showing the relationship between outside air temperature and cooling capacity of an air-cooled absorption chiller/heater, and FIG. 3 is a block diagram of a conventional air-cooled absorption chiller/heater. 1... Air-cooled absorption chiller/heater, 2... High-temperature regenerator, 3...
... Separator, 6... Low-temperature regenerator, 8... Air-cooled condenser. 9...Evaporator, 10...Air-cooled absorber. 11...High temperature solution heat exchanger. 12... Low temperature solution heat exchanger, 13... Solution circulation pump, 15... Refrigerant circulation pump, 19... Controller, 21... Refrigerant reservoir, 22...
Control valve, 25, 26, 28...pipe line.

Claims (2)

[Claims] (1) It has a regenerator, a separator, an evaporator, a high-temperature solution heat exchanger, a low-temperature solution heat exchanger, an air-cooled condenser that is directly cooled by air, an air-cooled absorber, a solution circulation pump, and a refrigerant circulation pump. is connected to the air-cooled condenser and the evaporator by pipes, and the refrigerant liquid is stored and the solution concentration is controlled by the pressure difference between the air-cooled condenser and the evaporator. A refrigerant reservoir to be adjusted, a control valve disposed in a pipe connecting the lower part of the refrigerant reservoir and the suction side of the refrigerant circulation pump, and any one of the temperature of the regenerator, the pressure of the separator, and the temperature of outside air. and a controller that operates the control valve when either the temperature or the pressure exceeds a set value. (2) The air-cooled absorption chiller-heater according to claim 1, wherein the control valve is a proportional control valve.