Vav valve with pwm hot water coil

Details Vav valve with pwm hot water coil Vav valve with pwm hot water coil

F - Mech Eng,Light,Heat,Weapons

24

F

236/2, 62/43

F24F 11/053 (2006.01) F24D 19/10 (2006.01) F24F 3/06 (2006.01) F24F 11/06 (2006.01) F25B 29/00 (2006.01)

Patent

CA 1289926

PATENT Title VAV VALVE WITH PWM HOT WATER COIL Inventor Mark E. Nurczyk Abstract A refrigeration system for temperature conditioning several comfort zones includes several VAV (variable air volume) valves each having a hot water coil conveying water whose flow rate is regulated by a PWM (pulse-width modulated) solenoid valve. Each VAV valve is connected to a supply air duct conveying cool supply air. When a zone's temperature is above a set point temperature, the opening of the VAV valve is modulated to meet the cooling demand, and the water coil is shut off. When a zone's temperature is below the set point, the VAV valve is opened to provide a predetermined constant airflow rate and the hot water coil's solenoid valve is cycled open and closed in a pulse-width modulated manner to meet the heating demand.

599813

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