Flat Type Adiabatic Pre-cooling System

Heat exchange process

The is a heat transfer device. Generally, the dry cooler needs a heat exchanger (finned coil) and a fan. The heat-carrying fluid (which can be water or other solutions) first enters the heat exchanger through the inlet of the header. The fan is responsible for guiding the airflow through the heat exchanger. The air and fluid exchange heat in the heat exchanger. Finally, the heat of the fluid is discharged into the atmosphere. After cooling, the fluid circulates back to the system through the outlet of the header.

Ambient temperature

In order for the dry cooler to be efficient, the air temperature needs to be lower than the water (or any other solution) in the system. Therefore, the dry cooler works more efficiently in cold climate areas. Dry coolers are often not affected by air humidity, as opposed to cooling towers.

Heat transfer medium

Generally, the heat transfer medium of the dry cooler shall meet the following requirements as far as possible

(1) Within the operating temperature range, no solidification, and gasification

(2) Nontoxic, good chemical stability, noncorrosive to metals

(3) Large specific heat, small flow required for conveying certain heat exchange

(4) Low density and viscosity can reduce flow resistance and power consumption of the circulating pump

(5) Large thermal conductivity can reduce the heat transfer area of heat exchange equipment

(6) Abundant sources and low prices

Therefore, to sum up, the most appropriate heat transfer medium is pure water. Of course, under extreme working conditions (below 0℃), an equivalent ethylene glycol solution should be added to prevent the fluid in the coil from freezing.

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