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The Difference Between Open Type And Closed Type Cooling Tower?

Oct 16, 2017

The difference between open type and closed type cooling tower?


1. The cooling principle of the open cooling tower is that the circulating water is sprayed to the filler of the glass fiber by means of the contact of the water with the air to reach the heat transfer. Then the fan drives the tower air circulation, Water heat transfer after the heat out, so as to achieve cooling.

This type of cooling, the first phase of the input less, but the higher operating costs (water consumption, power consumption).


2. Closed cooling tower cooling principle is, in simple terms, two cycles: an inner loop, an outer loop. No packing, the main core part of the copper tube surface cooler.

  ① internal circulation: docking with the object device, constitute a closed loop system (circulating medium for soft water). Cooling the target device, and bringing the heat from the target device to the cooling unit.

  ② outside the loop: in the cooling tower, the cooling tower itself to cool. Not in contact with the internal circulation of water, but through the cooling tower inside the copper tube cooler heat exchange heat. In this cooling mode, through the automatic control, according to the water temperature to set the motor running.

  Two cycles, in the spring and summer high temperature environment, the need for two cycles at the same time running. Autumn and winter environmental temperature is not high, in most cases only an internal circulation.



Closed cooling tower, or closed cooling tower, also known as closed cooling tower, referred to as the closed tower.

Closed cooling towers are derived from evaporative coolers and are actually a heat exchanger that combines the performance of a water cooled cooler with a conventional cooling tower and is a heat exchange between the water cooler and the air cooler Device, so there are manufacturers called "evaporative air cooler." Now this type of cooling equipment in the form of more common feature is in the wall-type heat exchanger outside the spray water and forced ventilation, heat from the wall-type heat exchanger within the cooling fluid through the wall to the wall outside the spray And then by the spray of water and air forced convection to the air, and spray water to the air heat transfer, mainly by the spray of water and the latent heat and spray the water and the sensible heat exchange composition. As the cooling fluid in the wall-type heat exchanger and the external process equipment between the closed cycle of circulation, to be different from the cooling fluid directly to the air in contact with the general cooling tower, it is "closed tower," said, and the corresponding will be The general cooling tower is called "open tower".