Method for controlling refrigerating system

Details Method for controlling refrigerating system Method for controlling refrigerating system

1987-12-27

1989-06-06

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62158, 62225, F25B 4104

Patent

active

048359807

ABSTRACT:
An electric signal T1 representing the evaporating temperature of refrigerant is processed by a phase lead network and thus converted to T1' with a single time constant so as to compensate for the time lag due to the time constant of a temperature sensor for sensing the evaporating temperature. An electrical signal T2 representing superheated vapor temperature at the outlet of an evaporator is processed by a phase lag network and thus converted to T2', so as to have a larger time constant than that of the unprocessed signal T2 and a signal corresponding to .DELTA.T'=T1'-T2' is used to control the degree of valve opening of an electric expansion valve.

REFERENCES:
patent: 2577903 (1951-12-01), McGrath
patent: 4459819 (1984-07-01), Hargraves
patent: 4475686 (1984-10-01), Huelle et al.
patent: 4617804 (1986-10-01), Fukushima et al.
patent: 4689968 (1987-09-01), McCulloch et al.

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