notes
period three
Capacity Control
purge 
condenser
vacuum pump
Figure 52
Purge System
As presented earlier, the accumulation of air and other noncondensable gases undermines the efficiency and reliability of the absorption chiller. Since absorption chillers operate below atmospheric pressure, regular operation of a purge system is required to remove, or “purge,” the air and other noncondensables that may leak into the chiller. This is necessary to maintain the pressures and temperatures within the chiller for maximum efficiency. The purge system is also used for early detection of leaks.
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