JPS5828918B2 - How to prevent cooling tower from freezing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing a portion of cooling water from adhering to the air suction port of the cooling tower or the lower part of the filling and freezing during operation of the cooling tower in winter.

Refrigerators, computer room air conditioners, etc. need to be used almost all year round, not just in the summer.

Particularly when using these products in the winter, as the outside temperature has dropped, some of the cooling water adhering to the air suction port and the bottom of the filling will be transferred to the low-temperature suction air due to the operation of the cooling tower. It often freezes.

The freezing of the air suction port and the lower part of the filling impedes the suction of cooling air into the tower, making it impossible to suck in the set amount of external air necessary for cooling, and causing the fan motor to overload. In addition, a phenomenon in which the cooling capacity decreases occurs.

The present invention eliminates the above-mentioned drawbacks and prevents the air inlet and the lower part of the filling from freezing even in winter, lengthens the circulation of cooling air, and enables safe operation of the cooling tower. The following description will be made based on examples.

In the figure, reference numeral 1 denotes a cooling tower casing whose size and shape are determined to have a desired cooling capacity.A filling material 2 is filled and supported in the casing 1 in the same way as in a normal cooling tower. A water sprinkling pipe 3 equipped with a shower nozzle for spraying cooling water above the filler 2 and a fan 4 that creates a negative pressure inside the casing to draw external air for cooling into the casing are provided respectively, and the lower part of the casing is provided with an air suction port 5 and a cooling water storage section 6 for storing cooling water after cooling.

An indirect heat exchanger 7 is disposed in the air suction port 5, and a return pipe of the heated cooling water returned from the compressor of the refrigerator or air conditioner is connected to the indirect heat exchanger 7. the inflow side of the heat exchanger 7, and the outflow side of the heat exchanger 7 is connected to the water sprinkler pipe 3.
This allows the heated cooling water after heat exchange to pass through the indirect heat exchanger and then be sprayed by the shower nozzle of the sprinkler pipe.

In addition, in cold weather, if sufficient cooling can be achieved without sprinkling cooling water from a shower nozzle, bypass piping 9 is installed before passing through an indirect heat exchanger or via a valve 8 between the heat exchanger and the water sprinkling pipe. This valve 8 is connected to the temperature sensor 1.
It is also possible to perform a switching operation by detecting the outside air temperature, cooling water temperature, etc. at 0, and return the cooling water to the storage section at the bottom of the casing via the bypass piping 9 before or after passing through the heat exchanger. In addition, a switch for stopping the operation of the fan may be provided.

Therefore, when the above-mentioned cooling tower is used in the winter, air is sucked into the casing through the air suction port 5 by the drive of the fan, passes through the filling material, is discharged outside the casing from the discharge port, and is discharged into the refrigerator. The cooling water is circulated by the drive of the pump of the air conditioner, heat exchanged by the compressor, and the heated cooling water is sent to the indirect heat exchanger.

This heated cooling water passes through an indirect heat exchanger installed at the air inlet, thereby warming the external air drawn into the casing through the exchanger. This can prevent water droplets at the bottom of the filler and filler from freezing.

Further, when the load, that is, the compressor is stopped, the temperature of the cooling water being circulated by the pump gradually decreases, and when it reaches a certain set temperature, the fan is stopped by a switch.

At this time, if bypass piping is in place, not only will the fan stop, but the temperature sensor will detect the water temperature, and when it reaches the set minimum allowable temperature, valve 8 (electromagnetic valve) will be operated and the casing The cooling water returned to the inside is guided to the reservoir at the bottom of the casing without sprinkling before or after passing through the indirect heat exchanger, thereby preventing a drop in water temperature due to passage of the filler.

Then, when the compressor (load) is operated again and the cooling water is heated, the air suction port is heated by the indirect heat exchanger through which the heated cooling water is passed, and the air suction is sucked again. Since the air is heated by this heat exchanger, water droplets of cooling water that adhere to the bottom of the filler do not freeze.

When the cooling water reaches a set allowable temperature or higher, the temperature sensor switches the valve 8, and the cooling water passes through an indirect heat exchanger and is sprinkled from the shower nozzle of the sprinkler pipe, exchanging heat with the sucked air. It is something that is cooled.

According to the present invention, since the refrigerator or air conditioner is cooled and the heated cooling water is guided into the casing through the indirect heat exchanger provided at the air suction port of the casing,
Even during winter use, the air sucked in is heated by this indirect heat exchanger, so freezing can be prevented in the air suction port and the lower part of the filler through which this heated air flows. It has advantages such as reduced maintenance during winter, easy piping construction, and easy capacity control in response to changes in load and outside air conditions.

[Brief explanation of drawings]

FIG. 1 is a front view, FIG. 2 is a longitudinal cross-sectional view, and FIG. 3 is a cross-sectional view. 1...Casing, 2...Filling material, 3
...Water pipe, 4...Fan, 5...
...Air suction port, 6...Cooling water reservoir, 7.
...Indirect heat exchanger, 8...Valve, 9...
...Bypass piping, 10...Temperature sensor.

Claims (1)

[Claims] 1 Cooling the condenser of a refrigerator, air conditioner, etc., and guiding the heated cooling water to an indirect heat exchanger installed at the air intake port of the casing, and passing the heated cooling water after the heat exchange into the indirect heat exchanger. After passing through a type heat exchanger, the air sucked in from the air suction port by sprinkling water from the shower nozzle of the water sprinkler pipe is heated by the above heat exchanger, and this causes the air to flow through the air suction port and the heated air. A method for preventing freezing of a cooling tower, characterized in that the air suction port and the lower part of the filling material are prevented from freezing during winter operation of the cooling tower by heating the inside of the casing.