Refrigeration – Automatic control – Refrigeration producer
Patent
1991-03-01
1992-03-31
Wayner, William E.
Refrigeration
Automatic control
Refrigeration producer
62513, F25B 4100
Patent
active
050996550
ABSTRACT:
A halocarbon refrigeration system including a compressor, condenser, thermal expansion valve, control for the thermal expansion valve, shell evaporator, suction line between the shell evaporator and compressor, and a control evaporator in the suction line between the shell evaporator and the control for the thermal expansion valve, the control evaporator utilizing hot refrigerant gas from the compressor to heat the refrigerant in the suction line and thus expose the control for the thermal expansion valve to heated refrigerant which in turn causes the thermal expansion valve to admit more liquid refrigerant to the shell evaporator to cause it to operate in a fully flooded condition, the control evaporator also insuring vaporization of all the liquid in the suction line prior to its passage to the compressor. The refrigeration system also includes a hot loop circuit between the outlet of the compressor and the inlet thereof and a cold loop circuit between the outlet of the compressor and the evaporator to bypass the condenser and thus pass refrigerant from the compressor back to the compressor to thereby permit it to selectively operate in an unloaded condition in response to the load applied by the medium which is being cooled. A sensing element for controlling the unloading of a compressor including a finned tube for placement in firm heat conducting engagement within a tube of a shell evaporator and containing a thermocouple which senses either the temperature of fluid within the tube or the temperature of the refrigerant on the outside of the tube which is located within the evaporator, depending on the amount of fluid flowing through the tube.
REFERENCES:
patent: 1969102 (1934-08-01), Shenton et al.
patent: 2521040 (1950-09-01), Casetta
patent: 3680326 (1972-08-01), Huelle
patent: 4293093 (1981-10-01), Raymond et al.
Arno Raymond P.
Carnes Scott C.
Gastel Joseph P.
Rayco Enterprises, Inc.
Wayner William E.
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