Refrigeration system

Details Refrigeration system Refrigeration system

1987-11-24

1989-02-28

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62225, F25B 4100

Patent

active

048074454

ABSTRACT:
The degree of opening of the expansion valve in refrigeration system is controlled by means of PID control such that a refrigerant superheat at the outlet of the evaporator approaches a target valve. Since an elapsed time after the start of the refrigeration system varies in response to a change of a heat load of air to be cooled by the evaporator, if the control constant of the PID control is designed so that the expansion valve can be controlled adequately for high evaporator heat load, or for low evaporator heat load, adequate control cannot be achieved in the opposite case not taken into consideration in design. According to the present invention, the control constant of the PID control is varied when an elapsed time after the start of the refrigeration system reaches a reference time which is determined on the basis of a heat load of air to be cooled by the evaporator.

REFERENCES:
patent: 2743403 (1956-04-01), Wernlund
patent: 4617804 (1986-10-01), Fukushima et al.

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