Pneumatic variable air volume controller

Details Pneumatic variable air volume controller Pneumatic variable air volume controller

1989-10-30

1990-09-18

Tapolcai, William E.

Automatic temperature and humidity regulation

Ventilator type

Pneumatically actuated

137487, 236 80R, F24F 1314

Patent

active

049572385

ABSTRACT:
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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