Refrigeration – Automatic control – Refrigeration producer
Patent
1996-06-14
1998-01-27
Wayner, William E.
Refrigeration
Automatic control
Refrigeration producer
62217, 62509, F25B 4100, F25B 3904
Patent
active
057111618
ABSTRACT:
Both a system and method are provided for achieving temperature control in a refrigeration circuit by providing a bypass flow of saturated, gaseous refrigerant from the receiver tank to a point in the circuit downstream of the evaporator coil. The system includes a bypass conduit for conducting a bypass flow of saturated, gaseous refrigerant from an upper portion of the receiver tank to a point in the circuit between the evaporator coil and a suction line throttling valve to partially offset the cooling of the evaporator coil from the expansion valve. The bypass conduit includes a valve mechanism for modulating this flow to achieve a desired temperature setpoint. The system also includes a temperature monitoring sensor located in a space conditioned by the refrigeration circuit, as well as a microprocessor. The input of the microprocessor receives an electrical signal generated by the monitoring sensor indicative of the temperature of the space. The output of the microprocessor is connected to the valve mechanism in order to modulate the flow of bypass refrigerant to achieve a desired temperature setpoint in the conditioned space.
REFERENCES:
patent: 4335742 (1982-06-01), Jacyno
patent: 4550574 (1985-11-01), Hohman
patent: 4694660 (1987-09-01), Gunnaway
patent: 4832068 (1989-05-01), Wendschlag et al.
patent: 4986084 (1991-01-01), Beckhusen
Thermo King Corporation
Wayner William E.
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