- O U R E D U C A T I O N . I N
AIR COOLING SYSTEMS
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
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 heat-
sink that makes for greater efficiency
IMPORTANCE OF SECOND LAW OF TD
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).
USE OF COOLER IN MOTORCYCLE
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 or
Boxer engine, once used extensively by Porsche and still
in use on BMW motorcycles.
USE IN INDUSTRY
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
A common sight around, for example, power station are the
large wasted concrete towers that emit steam more or less
constantly. These are, in part, using air cooling on a grand