Oil viscosity control method/system for a refrigeration unit

Details Oil viscosity control method/system for a refrigeration unit Oil viscosity control method/system for a refrigeration unit

1998-04-09

1999-08-17

Sollecito, John M.

Refrigeration

Processes

Lubricant handling

62193, 622285, F25B 4302

Patent

active

059376597

ABSTRACT:
A method for controlling oil viscosity in a refrigeration unit having an oil viscosity effecting parameter with a desired set point. The refrigeration unit includes an oil lubricated compressor having a capacity and a suction pressure, a condenser, refrigerant control valves, and an evaporator connected in series, for circulating a refrigerant for adjusting air temperature of a compartment. The method comprises the steps of measuring the parameter; controlling viscosity level of said oil so as not to interfere with proper operation of the compressor, including the steps of: setting a parameter range inclusive of the desired set point in which parameter is desired to fall, said range having a high point and a low point, wherein with said parameter in said range, viscosity of the oil is substantially at a desired level; cooling the air if based on said step of measuring the parameter is higher than said high point; heating the air if based said step of measuring the temperature is lower than said low point; and maintaining said air temperature if based on said means for sensing the parameter is within said desired range and toward said set point. A related system for oil viscosity control is also disclosed.

REFERENCES:
patent: 5062277 (1991-11-01), Heitmann et al.
patent: 5195327 (1993-03-01), Kim

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