Variable air volume system control

Details Variable air volume system control Variable air volume system control

1985-02-15

1986-04-29

Tanner, Harry

Automatic temperature and humidity regulation

Ventilator type

236 78D, 25112913, F24F 700

Patent

active

045851638

ABSTRACT:
An electronic control for positioning the damper in the air supply duct of a variable air volume system having a motor to open and close the damper, a thermostat circuit sensing temperature in a conditioned space and developing a voltage signal indicative of the temperature in the space relative to the thermostat setting, an electronic air flow sensing circuit sensing air flow into the conditioned space and developing a voltage signal indicative of air velocity, a circuit processes both signals and applies the difference between them to an electronic variable timer which effectively varies the motor speed (by varying the motor duty cycle) so said damper is moved slower as equilibrium between the space temperature and the set point of the thermostat is approached. The same voltage signals are fed into a logic circuit to determine the direction of motor rotation to determine whether the damper opens or closes.

REFERENCES:
patent: 3443121 (1969-05-01), Weisbrod
patent: 3677335 (1972-07-01), Weatherston
patent: 3797560 (1974-03-01), Zaharoni
patent: 4244517 (1981-01-01), Stanke et al.
patent: 4290274 (1981-09-01), Essex
patent: 4406397 (1983-09-01), Kamata et al.

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