JP3460915B2 - Absorption refrigeration equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigeration system, and more particularly to an absorption refrigeration system in which cooling water supplied to an absorber and a condenser is cooled by a cooling tower and circulated.

[0002]

2. Description of the Related Art Conventionally, when the cooling operation of an absorption chiller-heater is stopped, the concentration of the solution in the cycle is usually averaged, and in some cases, the refrigerant liquid in the evaporator is returned to the solution cycle side to obtain the cycle concentration. Are averaged to prevent crystallization of the solution while the cold water heater is stopped (this operation is usually called a dilution cycle). During this dilution cycle, there is a demand to stop the cooling water pump as quickly as possible in order to reduce the power consumption of the pump. However, if it is stopped too quickly, the solution temperature will be high and this solution will be sprayed onto the absorber heat transfer tube, so that the temperature of the cooling water in the absorber heat transfer tube will rise. In addition, in the absorption type hot and cold water device that simultaneously takes out cold and hot water, when there is no cold water load and the cooling water pump is stopped and the flow of cooling water is stopped, the absorption cold water heater is operating by circulating the solution. , The temperature of the cooling water in the absorber heat transfer tube rises. In such a case, the cooling water temperature in the absorber heat transfer tube is high, so
When sprayed on the filler (made of plastic) of the cooling tower, the filler may be deformed.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, even when high temperature cooling water is generated in the refrigerator,
An object of the present invention is to provide an absorption refrigerating apparatus that can protect the cooling tower filling material without being deformed and can hold cooling water at an appropriate temperature.

[0004]

In order to solve the above-mentioned problems, the present invention has at least an absorber, an evaporator, a regenerator, a condenser, and a solution heat exchanger. It has a cooling tower that forms a cycle and cools the cooling water supplied to the absorber and the condenser, and a cooling water pump that circulates the cooling water, and connects the cooling tower, the absorber, the condenser, and the cooling water pump. In the absorption refrigeration apparatus forming a cooling water circulation path with the cooling tower, the cooling tower has a sprinkler from the upper part, a packed bed filled with a filler , and a water tank in the lower part , and a cooling water circulation path connected to the sprinkler. to the <br/> branch point in the piping, the cooling water bypasses the diverging water system, a cooling water bypass pipe for guiding below the packed bed of the cooling tower is provided, a temperature sensor provided in the coolant circulation path Rutotomoni , The cold
The water discharge pump is driven by an inverter, and the temperature sensor
If the detected temperature is higher than the specified temperature, the cooling water circulation path
The control mechanism for reducing the circulating cooling water flow rate is provided. In the absorption refrigeration system, when the temperature detected by the temperature sensor is higher than a predetermined temperature, the bypass pipe is operated, and the flow rate of the bypass pipe is adjusted so that the detected temperature does not fall below the predetermined temperature. It has a control mechanism to operate.

[0005] The temperature sensor is between coagulation <br/> condenser cooling water circulation path of the branch point, and / or can kick set between the absorber from the cooling tower of the cooling water circulation path, the cooling tower A control mechanism that detects the temperature of the cooling water supplied to the absorber and the condenser from the side and adjusts the flow rate of the bypass pipe so that this temperature does not fall below a predetermined temperature may be provided. The control mechanism that operates or adjusts the bypass pipe,
It is preferable to control a three-way valve provided at the branch point or a two-way valve provided in the bypass pipe .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION When the temperature of the cooling water in the absorber heat transfer pipe is rising, the temperature distribution of the cooling water system is examined. The cooling water accumulated in the cooling water pipe and in the lower water tank of the cooling tower is shown. Since water has a low temperature, when mixed and averaged, it often falls within the allowable dispersion temperature range of the cooling tower, and the present invention was made based on this finding. Also,
When the temperature of the cooling water is high, it is possible to dissipate the heat by simply flowing the cooling water to the upper space of the lower water tank without spraying it on the filler. The cooling water temperature can be set to be equal to or lower than the spraying allowable temperature of the cooling tower. Therefore, the present invention provides a pipe having a valve that bypasses the sprinkler of the cooling tower, monitors the temperature, and when the temperature is high, allows the cooling water to flow through this bypass to protect the filler in the cooling tower. .

The cooling water temperature is lowered by the mixing in the piping, the bypass, and the heat radiation in the lower water tank, and after the cooling water temperature becomes lower than the spraying allowable temperature of the cooling tower, the spraying to the cooling tower filling material is started. do it. Further, in the present invention, even when the cooling water temperature is too low, the bypass valve is used,
By bypassing the spraying device and the filler, it is possible to prevent a low temperature. That is, if cooling water is sprayed from the sprinkler to the filler, the temperature will be low, but if you put it in the lower water tank from the bypass, it will not radiate much heat, so the cooling water temperature to the absorption refrigerator side will be adjusted by adjusting the flow rate between the sprinkler and bypass. You can

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a flow configuration diagram of the absorption refrigeration apparatus of the present invention. In FIG. 1, A is an absorber, GL is a low temperature regenerator, and G is
H is a high temperature regenerator, C is a condenser, E is an evaporator, XL is a low temperature heat exchanger, XH is a high temperature heat exchanger, SP is a solution pump, R
P is a refrigerant pump, CW is a cooling tower, WP is a cooling water pump,
T ₁ and T ₂ are temperature sensors, V ₁ is a bypass valve, 1 to 4
Is a cooling water pipe, 5 is a bypass pipe, 6 is a sprinkler device, 7 is a packed bed, 8 is a lower water tank, 10 to 14 are refrigerant pipes, 15 is a heat source pipe, 16 is a cold water pipe connected to a cooling load, 21 to 21.
23 and 28 are dilute solution pipes, and 24-27 are concentrated solution pipes.

In the cooling operation of this apparatus, a part of the diluted solution that has absorbed the refrigerant is branched from the absorber A by the solution pump SP through the heated side of the low temperature heat exchanger XL in the circuit 22, and a part of the diluted solution is high. Circuit 23 passing through the heated side of the heat exchanger XH
Is introduced into the high temperature regenerator GH. In the high temperature regenerator GH, the dilute solution is heated by the heating heat source 15 to evaporate the refrigerant to be concentrated, and the concentrated concentrated solution passes through the circuit 26 and is heat-exchanged in the high temperature heat exchanger XH, and the low temperature regeneration is performed in the circuits 27 to 24. Combine with concentrated solution from vessel GL. On the other hand, the remaining dilute solution branched in the circuit 22 is introduced into the low temperature regenerator GL from the circuit 28. In the low temperature regenerator, after being heated and concentrated by the refrigerant vapor from the high temperature regenerator, it merges with the concentrated solution from the high temperature regenerator GH in the circuit 24, then passes through the heating side of the low temperature heat exchanger XL, and from the circuit 25 to the absorber. Introduced in A.

The refrigerant gas evaporated in the high temperature regenerator GH passes through the refrigerant circuit 13, is used as a heat source of the low temperature regenerator GL, and is then introduced into the condenser C. In the condenser C, the refrigerant gas from the low temperature regenerator GL is cooled by the cooling water and condensed, and the condensed gas enters the evaporator E from the circuit 12. In the evaporator E, the refrigerant is circulated and evaporated by the refrigerant pump RP and the circuits 10 and 11, and at that time, the heat of evaporation is taken from the cold water on the load side, the cold water is cooled, and the cold water is provided for cooling. The evaporated refrigerant is cooled by cooling water in the absorber A, absorbed by the concentrated solution, becomes a dilute solution, and is cycled by a solution pump. In such a cooling cycle, the cooling water used in the absorber A and the condenser C passes from the path 1 to the heat transfer section 2 of the absorber A by the cooling water pump WP from the lower water tank 8 of the cooling tower CW, and then is condensed. Cooling tower C from path 4 through heat transfer section 3 of vessel C
Water is sprinkled on the packed bed 7 from the water sprinkler 6 of W. The water cooled by this sprinkling is stored in the lower water tank 8 and circulated by the cooling water pump WP.

In the present invention, the cooling water circulated in this way is introduced by the temperature sensor T ₁ or the temperature sensor T ₂ into the cooling tower CW, or further exits from the cooling tower. The temperature is detected and can be controlled as follows. That is, the temperature sensor T
_When the detected temperature of ₁ becomes higher than a predetermined temperature (for example, 55 ° C.), the valve V ₁ of the bypass pipe 5 is opened by the signal of the controller 9 and the cooling water is not sprayed on the packed bed. Bypass and spray directly to the aquarium. Further, if the temperature of the cooling water becomes too low, the absorption cycle concentration becomes too low to support the load of cold water, and in such a case, the temperature detected by the temperature sensor T ₁ is a predetermined temperature (for example, 15).
The flow rate of cooling water to be passed through the bypass pipe 5 can be adjusted by controlling the valve V ₁ by the controller 9 so that the temperature does not fall below ℃). For such control, a temperature sensor T ₂ is provided,
It is also possible to control the valve V ₁ by the controller 9 according to the temperature detected by the temperature sensor T ₂ .

FIG. 2 shows another flow diagram of the absorption refrigeration system of the present invention. 2 is a high temperature regenerator G in FIG.
The refrigerant circuit 3 from H is provided with a branch circuit 31 from the branch point 30 to the hot water heater W to show a cycle in which cold water and hot water can be supplied at the same time. An apparatus having a cooling water circulation path of the invention can be applied. In FIG. 2, 31-33, 35, 37
Is a refrigerant circuit, 34 is a control valve, 39 is a main refrigerant adjusting valve, 3
6 is a branch point. In the above drawings, an example in which the bypass pipe 5 is provided with the two-way valve V ₁ has been described, but the bypass pipe may be connected to the pipe line 4 by providing a three-way valve. Further, when the cooling water pump driven by an imperator is used, when the cooling water is at a high temperature, the bypass valve V ₁ is operated so as not to adversely affect the filling material. If the number is reduced, the size of the bypass valve can be reduced (cost reduction).

[0013]

According to the present invention, even when high temperature cooling water is generated in the refrigerator, the cooling water is kept at an appropriate temperature without deforming the packing material of the cooling tower and corresponding to the cooling water load. It is possible to operate the absorption refrigeration system efficiently.

[Brief description of drawings]

FIG. 1 is a flow configuration diagram of an absorption refrigeration apparatus of the present invention.

FIG. 2 is another flow configuration diagram of the absorption refrigeration apparatus of the present invention.

[Explanation of symbols]

A: absorber, GL: low temperature regenerator, GH: high temperature regenerator,
C: condenser, E: evaporator, XL: low temperature heat exchanger, XH:
High temperature heat exchanger, SP: Solution pump, RP: Refrigerant pump,
CW: cooling towers, WP: cooling water pump, T _1, T _2: temperature sensor, V _1: bypass valve, W: hot water heater, 1
4: Cooling water pipe, 5: Bypass pipe, 6: Sprinkler,
7: Packed bed, 8: Lower water tank, 9: Controller, 10-14:
Refrigerant piping, 21-28: Solution piping, 15: Heat source piping, 1
6: cold water piping, 30, 36: branch points, 31-33, 3
5, 37: Refrigerant piping, 34: Control valve, 39: Main refrigerant adjusting valve

Claims (5)

(57) [Claims] 1. At least an absorber, an evaporator, a regenerator,
A cooling water tower that has a condenser and a solution heat exchanger, forms a refrigeration cycle by connecting these equipment, cools the cooling water supplied to the absorber and the condenser, and a cooling water pump for circulating the cooling water. In the absorption refrigerating device having a cooling tower, an absorber, a condenser and a cooling water pump to form a cooling water circulation path, the cooling tower is a sprinkler from above, a packed bed filled with a filler , and A branch point in the piping of the cooling water circulation path that has a water tank at the bottom and is connected to the sprinkler.
, The cooling water bypasses the diverging water system, a cooling water bypass pipe for guiding below the packed bed of the cooling tower is provided, a temperature sensor provided in the coolant circulation path Rutotomoni, the cooling water ports
The temperature is detected by the temperature sensor.
If the temperature is above the specified temperature, it will circulate in the cooling water circulation path.
An absorption refrigeration apparatus having a control mechanism for reducing the flow rate of cooling water to be reduced. 2. The absorption refrigerating apparatus according to claim 1, further comprising a control mechanism that activates the bypass pipe when the temperature detected by the temperature sensor exceeds a predetermined temperature and is high. 3. The absorption refrigerating apparatus according to claim 1, further comprising a control mechanism that adjusts a flow rate of the bypass pipe so that a temperature detected by the temperature sensor does not fall below a predetermined temperature. 4. A control mechanism for actuating or regulating the bypass piping claim 2, wherein two-way valve control der Rukoto provided in 3-way valve or the bypass pipe provided in the branch point unit or 3. The absorption refrigeration system described in 3. 5. The temperature sensor is a cooling water circulation path.
Between the evaporator and the branch point and / or the cooling water circulation path
Absorption refrigerating apparatus according to any one of claims 1-4, characterized in that the cooling tower of the road is provided between the absorber.