Variable air volume system controls

F - Mech Eng,Light,Heat,Weapons – 24 – F

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341/38.5

F24F 11/04 (2006.01) F24F 11/00 (2006.01)

Patent

CA 1196710

ABSTRACT A method of controlling the air flow output of a selected variable inlet vane fan comprising the steps of: generating a flow control signal in a controller which is programmed to selectively provide a first signal which is proportional to the increasing response plot of air flow with respect to vane position when the vanes of the selected fan are opening or a second signal which is proportional to the decreasing plot of the air flow with respect to vane position when the inlet vanes of the selected fan are closing, detecting the direction of response required to meet the demand variation as between a requirement for increased air flow and a requirement for decreased air flow, activating the controller to provide said flow control signal in the form of said first signal when a requirement for increased flow is detected and to provide said flow control signal in the form of said second signal when a requirement for decreased flow is detected, transmitting said flow control signal to said fan to control the position of the inlet vanes of the fan as required in use.

419624

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