HistoryAir-con was systematically developed by Willis Haviland
Carrier in 1902Later on 1st room cooler by Frigidaire in 1928Then
subsequently develop by GE in 1930
IntroductionASHRAE defines air conditioning as ;
The process of treating air so as to control simultaneously its
temperature, humidity, cleanliness and distribution to meet the
requirements of the conditioned space
Roles of Air conditioningProvide human comfortable
Provides a required pressure and temperature in industrial
process
Important KeywordsEnthalpyThe quantity of heat necessary to
raise the temperature of a substance from one point to a higher
temperature. The quantity of heat includes both latent and
sensible
EntropyThe thermodynamic entropy S, often simply called the
entropy in the context of thermodynamics, is a measure of the
amount of energy in a physical system that cannot be used to do
work. It is also a measure of the disorder present in a system. The
SI unit of entropy is JK-1 (joule per kelvin), which is the same
unit as heat capacity
Specific Heat (Cs)The ratio of thermal energy required to raise
the temperature of a body 1 to the thermal energy required to raise
an equal mass of water 1
SuperheatWhen liquid refrigerant admitted to a cooling coil, it
will vaporizes completely before reaching the end of the cooling
coil. As the cold vapor flows through the balance of the cooling
coil it continues to absorb heat and becomes superheated
