Refrigeration – Processes – Compressing – condensing and evaporating
Patent
1994-03-03
1995-07-25
Wayner, William E.
Refrigeration
Processes
Compressing, condensing and evaporating
62218, 137412, 25112905, 236 75, F25B 4104, F16K 3118
Patent
active
054351456
ABSTRACT:
Pulse width modulation is used to control the flow rate through a solenoid expansion valve in a refrigeration system using a simple vapor compression cycle. The refrigeration cycle includes a phase separator which receives two phase refrigerant from the condenser and supplies liquid refrigerant to the pulse width modulated solenoid valve. A liquid level sensor is disposed in the phase separator, and a controller for controlling the duty cycle of the pulse width modulated solenoid valve is provided to receive input from the liquid level sensor. The liquid level sensor can be of the type which provides a continuously variable signal as a function of liquid level, or it can be a liquid level switch which controls valve duty cycle on the basis of whether the phase separator liquid level is above or below a set level. Alternatively, two liquid level switches can be provided.
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General Electric Company
Scanlon Patrick R.
Wayner William E.
Webb II Paul R.
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