Cascaded control apparatus for controlling unit ventilators

Details Cascaded control apparatus for controlling unit ventilators Cascaded control apparatus for controlling unit ventilators

1991-06-11

1993-05-04

Wayner, William E.

Automatic temperature and humidity regulation

Combined heater and apartment controlled

236 38, 236 78D, 236 84, G05D 1500

Patent

active

052073793

ABSTRACT:
A controller having two cascaded PID control loops in the control of unit ventilators of the type which have a heating coil, a fan, and a damper for admitting outside air into a room in which the unit ventilator is located. The controller utilizes the sensed room temperature and a room temperature set point to generate a set point for the temperature of the air being discharged from the unit ventilator, and utilizes the discharge temperature set point and the sensed discharge temperature to control the damper position and the operation of the heating coils of the unit ventilator.

REFERENCES:
patent: 3754125 (1973-08-01), Rothstein
patent: 4649709 (1987-03-01), Kagohata et al.
patent: 4684409 (1987-09-01), Lehman
patent: 4882526 (1989-11-01), Iino et al.
patent: 4925089 (1990-05-01), Chaparro et al.

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