Refrigerant flow rate control based on suction line temperature

Details Refrigerant flow rate control based on suction line temperature Refrigerant flow rate control based on suction line temperature

1994-03-03

1995-05-16

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62225, 62513, F25B 4104

Patent

active

054150086

ABSTRACT:
Pulse width modulation is used to control the flow rate through a solenoid expansion valve in a refrigeration system. A device for sensing suction line temperature is provided, and a controller is included for controlling the duty cycle of the pulse width modulated solenoid valve. The controller receives input from the suction line temperature sensing device as a basis for controlling the duty cycle. The suction line temperature sensing device may be a temperature sensor disposed on the suction line at the midpoint of the heat exchanger between the suction line and the liquid line. Alternatively, the suction line temperature sensing device may include a first temperature sensor disposed on the liquid line at one end of the heat exchanger and a second temperature sensor disposed on the liquid line at another end of the heat exchanger.

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Buxton, Joseph, "Solid State Circuits Simplify Temperature Sensing & Control," Electronic Component News, vol. 37, No. 10, ECN Sensors Supplement, Oct. 1993.

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