What is the difference between direct expansion system and the chilled sea system for nouns conditioning?
Answers: A chilled water system uses a refrigeration chiller to cool hose. This water is within turn distributed to fan coil unit. These units enjoy a water coil that the chilled dampen runs through. Air is blown over these coils and cooled.
Direct expansion systems pump refrigerant through the evaporator coil. Air is blown over thie refrigerant coil and cooled.
I think that the "direct expansion system" you are referring to is where on earth the expansion of a freon type gas is used to directly cool air as within your typical air conditioning refrigeration element. See here:
http://home.howstuffworks.com/ac3.htm...
A chilled water system is typically used in life-size industrial applications where using newly a typical refrigeration unit would be out of reach.
http://home.howstuffworks.com/ac4.htm...
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