Cooling Down by Evaporating
by:
Thomas Yoon
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.
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