F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
F25B 43/02 (2006.01) F04C 29/00 (2006.01) F25B 1/047 (2006.01) F25B 31/00 (2006.01) F25B 49/02 (2006.01)
Patent
CA 2127340
A method and apparatus for monitoring oil charge loss for use with a refrigeration system. The refrigeration system has a compressor for compressing a refrigerant gas, an oil/gas separator for separating compressed refrigerant from lubricating oil, a condenser for condensing the compressed refrigerant gas, an oil cooler for cooling oil separated from the refrigerant, the refrigerant and oil both having known and differing coefficients of heat transfer, and an injection system for injecting the cooled oil into the compressor. The method includes the steps of: a. determining the difference in temperatures of oil cooled in the oil cooler and refrigerant cooled in the oil cooler based on the known coefficients of heat transfer of the refrigerant and the oil and the cooling capacity of the oil cooler; b. sensing the temperature of the liquid in the oil cooler; c. sensing the temperature of the saturated refrigerant in the condenser; d. comparing the temperature of the liquid in the oil cooler and the temperature of the saturated refrigerant in the condenser; and e. generating a signal to shut down the compressor when the comparison of the temperature of the liquid in the oil cooler and the temperature of the saturated refrigerant in the condenser indicates that the liquid in the oil cooler is refrigerant or if the oil temperature is excessive.
Carey Michael D.
Oltman Robert L.
Fetherstonhaugh & Co.
Trane International Inc.
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