| AIR
CONDITIONER |
Why
do Coolers Cool ?
What is the function of a thermostat ?
What is a pressure
switch ? |
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| Why do
Coolers Cool? |
Answer:We all have experienced the cold feeling when we are sweating when the
wind blows. This feeling occurs because the water has the property of
taking heat from the surroundings when evaporating and turning into gas.
If we express this in another way, if we apply heat to a liquid it turns
into gas this heat is called evaporation latent heat.
In
a coller freon 12 (R-12) from 134(R-134) is used. When the liquid freon
turns into gas it taks latent heat from its surroundings however if it
is allowed to disperse as a gas this is uneconomical. We need a device
which uses some method to collect gas and turn it back into liquid before
evaporating it again, and to repeat this cycle continuously. A cooler
is such a device. The fluid which turns into a liquid and then bcomes
a gas to cool the surroundings is called the refrigent.
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| What
is the function of a thermostat? |
Answer:The
thermostat is used to prevent the formation of frost on the evaporator.
If the temperature of the refrigerant goes below 0 degree Celsius frost
will form on the fins or they will freeze, there by reducing the air supply
and deteriorating the cooling capacity to prevent this problem the thermostat
is used to control the room air temperature to a desired level. |
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| What
is a pressure switch? |
Answer:A
pressure switch protects the air conditioner system from troubles this
switch is used to stop the compressor if an excessively high pressure
in the refrigeration cycle is detected by the diaphragm. There by the
equipment in the regrigeration cycle is protected from troubles. |
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