Cooling Down by Evaporating:

Evaporator coils of air conditioning systems are sometimes called 
cooling coils. But cooling coils are also used in air-handling 
units. These contain chilled water. These are completely different 
from those used in direct expansion air cond units.

So cooling coils is not an accurate word to use in small air cond 
units. Evaporator coils should be used instead. Evaporator tubes 
must contain refrigerant liquid that can evaporate to become gas.

In an air conditioning system, when the liquid refrigerant absorbs 
heat, it turns to gas. The heat is thus transfered to the 
refrigerant. That's how the heat is moved from one location to 
another location.

The evaporator coils are located in the low-pressure system of a 
refrigeration circuit.

A word of caution!

If you run the evaporator blower without running the air cond 
system, sometimes you might get a burst tube in the evaporator.

Why? The heat from the blower air, evaporating the refrigerant 
in the evaporator tubes, and with no where to go (remember the 
air cond compressor is not running), will cause high pressures 
in the tubes.

So be careful that you do not run the blower while the air cond 
system is not running.

Until next time...

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Thomas Yoon's skill in illustration/writing has enabled him to produce numerous ebooks on engineering subjects that can be downloaded at Engineering E-books. He has also produced an ebook on "50 Secrets of Truth and Life" that is fully illustrated with cartoons in a humorous way. Subscribe to facworld ezine More information at Marine Engineer andM & E Engineer Article Source: http://EzineArticles.com/?expert=Thomas_Yoon