EXPANSION VALVE CONTROL FOR HEAT TRANSFER SYSTEM
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United States of America Patent
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Issued Date -
Sep 18, 2014
app pub date -
Mar 15, 2013
filing date -
Mar 15, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A compressor is connected with an evaporator, a condenser, and an electrically controlled valve for circulating a working fluid in a system for recovering waste heat to provide heated water for human use. A suction superheat temperature is determined from a measured compressor suction temperature and a suction saturation temperature. The electrically controlled valve is adjusted to maintain the suction superheat temperature at a suction superheat set point. The electrically controlled valve may be incrementally closed when a compressor suction pressure exceeds a maximum suction pressure. A discharge superheat temperature can be determined from a measured compressor discharge temperature and a discharge saturation temperature. The electrically controlled valve may be incrementally closed when the discharge superheat temperature falls below a minimum discharge superheat temperature.
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