VAPOR COMPRESSION COOLING SYSTEM WITH IMPROVED ENERGY EFFICIENCY THROUGH ECONOMIZATION
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United States of America Patent
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app pub date -
Apr 13, 2012
filing date -
Apr 19, 2011
priority date (Note) -
Abandoned
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Abstract
A cooling system has a cooling circuit that includes an evaporator disposed in a cabinet, a condenser, a compressor, an electronic expansion valve and a liquid pump. a direct expansion mode and a pumped refrigerant economizer mode. When the cooling system is in the pumped refrigerant economizer mode, the controller controls a temperature of the refrigerant to a refrigerant temperature set point by regulating a speed of a fan of the condenser, controls a temperature of air in a room in which the cabinet is disposed to a room air temperature setpoint by regulating a speed of the liquid pump, and maintains a pressure differential across the liquid pump within a given range by regulating an open position of an electronic expansion valve.
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