Electronic control for expansion valve in refrigeration system

Details Electronic control for expansion valve in refrigeration system Electronic control for expansion valve in refrigeration system

1984-12-14

1986-02-25

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62225, F25B 4100

Patent

active

045719519

ABSTRACT:
A refrigeration system comprises a compressor, a condenser, a receiver, an evaporator, and an adjustably controllable expansion valve connected in the refrigerant supply line from the receiver to the evaporator. An electronic control system adjustably controls the expansion valve so as to maintain the maximum amount of liquid refrigerant in the evaporator while preventing flow of liquid refrigerant to the compressor. The electronic control system measures both the actual refrigerant temperature and refrigerant vapor pressure at a common point near the evaporator outlet port, converts the measured vapor pressure to a saturation temperature, determines the differential between the two temperatures and adjusts the expansion valve in accordance therewith, i.e., closing or opening in response to differentials below or above a set point, respectively.

REFERENCES:
patent: 2260682 (1941-10-01), Robson
patent: 4478051 (1984-10-01), Ibrahim
patent: 4499739 (1985-02-01), Matsuoka et al.

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