Refrigeration – Processes – Compressing – condensing and evaporating
Patent
1982-03-19
1984-08-28
Wayner, William E.
Refrigeration
Processes
Compressing, condensing and evaporating
62160, 62202, F25B 100, F25B 1300
Patent
active
044676131
ABSTRACT:
Apparatus for and a method of automatically adjusting the superheat setting of a thermostatic expansion valve of a refrigeration system is disclosed in which the superheat of the refrigeration system is maintained at a low superheat level so as to maximize the operating efficiency of the refrigeration system, and yet which prevents the return of excessive amounts of liquid refrigerant to the compressor which would be likely to cause damage to the compressor. This apparatus includes an electric heater for biasing the thermostatic sensing bulb of the thermostatic expansion valve and a control for the heater which is responsive to a refrigeration system parameter, such as the temperature of the lubricant in the compressor sump, so as to effect an increase in the temperature of the thermostatic bulb above the refrigerant temperature upon an indicated change in the parameter being monitored thereby to, in effect, reduce the superheat setting of the thermostatic expansion valve and to increase the flow of refrigerant through the refrigeration system. Upon sensing another indicated change in the parameter, the heater is de-energized (or at least the heater power is reduced) thereby to effect an increase in the superheat setting of the thermostatic expansion valve and to reduce the flow of refrigerant.
REFERENCES:
patent: 2296680 (1942-09-01), McLenegan
patent: 3967781 (1976-07-01), Kunz
patent: 4067203 (1978-01-01), Behr
Behr Joseph L.
Hargraves David P.
Emerson Electric Co.
Wayner William E.
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