Patent ID: 6843064

Claim:
A method of reducing evaporator superheat fluctuation and improving evaporator heat transfer comprises pulsating the supply of refrigerant to the evaporator sufficient to create a turbulent flow of refrigerant by providing a mechanically operated valve in a refrigerant supply line to the evaporator, the valve having a refrigerant inlet flow control port and a device and components cooperating therewith for rapidly and positively opening and closing said inlet flow control port, and operating the valve to rapidly open and close said flow control port at a frequency of between 0.5 hertz and about 500 hertz and alternately increasing and decreasing refrigerant pulsation at said inlet flow control port to provide pressure fluctuations of the refrigerant thereat of at least 2% of the mean pressure to create said turbulent flow of refrigerant supplied to the evaporator.