Pneumatic variable air volume controller

Details Pneumatic variable air volume controller Pneumatic variable air volume controller

G - Physics

05

D

137/34

G05D 7/00 (2006.01) F24F 11/053 (2006.01) F24F 13/15 (2006.01) G05D 23/185 (2006.01)

Patent

CA 2021800

PNEUMATIC VARIABLE AIR VOLUME CONTROLLER ABSTRACT OF THE DISCLOSURE In a pneumatic variable air volume controller, a linear relationship is achieved between the actual air velocity in a duct carrying conditioned air to a defined area and a pneumatic pressure signal representing the temperature in that area; and this linear relationship is used to vary the volume of air flowing in the duct. This is achieved by comparing a pneumatic pressure control signal which is a linear representation of the velocity pressure in the duct to a pneumatic pressure control signal which varies as the square of a thermostat pneumatic pressure signal which itself varies in a linear manner with respect to the temperature in the controlled area.

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