AIR COOLING SYSTEMS

BY: blog.oureducation.in

Air cooling is a method of dissipating heat. It works by making the object to be cooled have a larger surface area or have an increased flow of air over its surface, or both. An example of the former is to add fins to the surface of the object, either by making them integral or by attaching them tightly to the object's surface (to ensure efficient heat transfer). In the case of the latter it is done by using a fan blowing air into or onto the object one wants to cool. In many cases the addition of fins adds to the total surface area making a heatsink that makes for greater efficiency in cooling.

AIR COOLING

In all cases, the air has to be cooler than the object or surface from which it is expected to remove heat. This is due to the second law of thermodynamics, which states that heat will only move spontaneously from a hot reservoir (the heat sink) to a cold reservoir (the air).

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IMPORTANCE OF SECOND LAW OF TD

Air is mainly used for air-cooled internal combustion engines (ICE), particularly those powering aircraft, because it is a readily available fluid and is often at a suitable temperature to be used efficiently. While many such ICE are called "liquid cooled" the cooling liquid is usually cooled by air passing through a radiator or heat exchanger. Examples of direct air cooling in modern automobiles are rare. The most common example is the Flat engine orBoxer engine, once used extensively by Porsche and still in use on BMW motorcycles.

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USE OF COOLER IN MOTORCYCLE

A very large number of industrial processes use air as a cooling medium, either directly or indirectly. Air conditioning is a very common process in which the air in a room, or a whole building, is cooled in order to maintain a comfortable environment for its occupants. Often the air has been cooled by chilled water or brine and the heat transferred to that medium is transported outside the building where, often, fan-driven water-to-air heat exchanging is again effected to reject the heat into the atmosphere. A common sight around, for example, power station are the large waisted concrete towers that emit steam more or less constantly. These are, in part, using air cooling on a grand scale

USE IN INDUSTRY

EVAPORATIVE COOLER

ESTIMATING AIR COOLER TEMP.

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