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30 TRG-TRC004-EN
notes
period three
The Compressor in a System
Period Two presented several methods used to control the capacity of a
compressor. This next section considers the entire system in order to determine
how the capacity of the compressor is controlled to maintain desired space
conditions.
System-Level Control
The method of controlling compressor capacity to maintain desired space
conditions depends on 1) whether the system is a chilled-water or a direct-
expansion system, and 2) how the airside system responds to changes in space
loads.
Generally, in air-conditioning applications, compressors will be applied in either
a chilled-water or a direct-expansion (DX) system. A chilled-water system
uses water as the cooling media. The refrigerant inside the evaporator absorbs
heat from the water, and this water is pumped to coils in order to absorb heat
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