precooler

precooler

[prē′kül·ər]
(mechanical engineering)
A device for reducing the temperature of a working fluid before it is used by a machine.

precooler

A type of heat exchanger in the aircraft air-conditioning system that is like a radiator. The air to be cooled passes around the cores through which the ram air passes.
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The precooler has thousands of thin-walled tubes filled with helium, providing a high surface area with low weight and rapidly absorbing heat.
After transferring energy to the high pressure side, the low pressure side s-C[O.sub.2] is then cooled to be close to the critical temperature of s-C[O.sub.2] by secondary water flow in the precooler. The s-C[O.sub.2] flow rejects heat in the precooler and makes sure that the high density s-C[O.sub.2] is compressed by the compressor.
Firstly, a portion of S-C[O.sub.2] exiting from LTR hot side is cooled in the precooler (PC), compressed by the MC and preheated in the LTR sequentially.
As a general rule, the once-through water from condensers and precooler is collected in open tanks and used for flushing manure from the freestalls and milk barns.
The precooler allows the hot compressed air from the turbines to be processed at a substantially cooler temperature than was previously possible, which, in turn, cools the aircraft's interior and prime mission equipment, as well as positively affecting other secondary systems.
A desiccant wheel system with precooler can be added as an option.
Hot water dip followed by cooling--By using hot water bath and forced air precooler (Rinac India Ltd., Bangalore, India)
It is a heat pump system consisting of a two-stage rotary compressor, an oil separator, a preheater, a precooler, a gas cooler, four expansion valves, a test section, an auxiliary evaporator, and an accumulator.
One of the unique features of the control system is its two large flat-panel displays of the Precooler temperatures that are large enough for the fork lift drivers to see as they zip by.