Method and apparatus for initiating coil defrost in a refrigeration system evaporator
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United States of America Patent
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Nov 17, 2015
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N/A
app pub date -
Mar 21, 2014
filing date -
Mar 21, 2013
priority date (Note) -
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Abstract
A system for controlling the defrost cycle of an evaporator comprising a sensor in the coil of an evaporator or downstream of the coil, the sensor configured to determine changes in the liquid mass ratio of the refrigerant in the evaporator. The difference in liquid mass ratio relating to frost buildup on the outside of said evaporator. When the difference in liquid mass ratio reaches a predetermined amount, corresponding to an unsatisfactory frost buildup, a defrost cycle is initiated. When the liquid mass ratio returns to a value that corresponds to a defrosted evaporator, the defrost cycle is discontinued.
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