I. Overview of Overflow

Closed-loop cross flow cooling towers, named for the spray water flowing across the direction of the hot air, with the spray water flowing from top to bottom and the air entering horizontally from the side, passing over the heat exchanger coils in the middle, cross-exchanging with the falling spray water to lower the temperature of the spray water.

Primarily composed of heat exchanger coils, spray water system, exhaust system, and framework shell.

II. Work Process

The spray pump draws water from the water tank, pumps it to the upper part of the heat exchange coil, and sprays it in an umbrella shape through nozzles, covering the outer surface of the pipe material continuously and evenly, forming a thin water film. A portion of the water absorbs the heat energy of the high-temperature refrigerant inside the pipe, converting it into latent heat of vaporization, evaporating into a gas state. The refrigerant inside the pipe material is cooled and condensed into a liquid state, while the water that does not evaporate falls back into the spray water tank.

Drafting system, the top tower fan is an intake type, drawing air from inside the tower and exhausting it outside. The cold dry air outside the tower enters the heat exchanger coils from the side, carrying away the evaporated water vapor, increasing the humidity and temperature of the air, which is then extracted to the outside of the tower by a fan located between the two heat exchanger coils.

Within the spray pool sump, a float ball valve is installed. When the water level is low, it automatically supplements the supply to ensure a consistent water level in the sump.

III. Operation Principle

Closed-loop water system: The cooled recycled water from the coil flows out of the tower, is pumped to the heat source (the cooled equipment) by the system's circulating pump, and then enters the coil for cooling after being heated by heat exchange.

External recirculating water system: After the external spray water achieves the purpose of cooling the internal circulating water of the coil by contacting with the coil and packing, it falls into the lower water trough and is then pumped to the spray water trough for recirculation by the spray water pump.

The internal circulation is cooled through heat exchange with the external spray water and air via the coil, which avoids direct contact between the cooled water and air, preventing water quality contamination. The heat exchange effect is even more pronounced as the spray water has been pre-cooled by PVC packing.

Section 4: Quality Advantages

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