Pneumatic variable air volume controller
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United States of America Patent
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-
Sep 18, 1990
Grant Date -
N/A
app pub date -
Oct 30, 1989
filing date -
Oct 30, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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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