Automatic temperature and humidity regulation – Ventilator type
Patent
1986-12-22
1988-03-22
Wayner, William E.
Automatic temperature and humidity regulation
Ventilator type
165 22, F24F 700
Patent
active
047323183
ABSTRACT:
A building temperature control system is velocity based, employing the velocity of air flowing into individual zones of temperature control to control temperature of the individual zones, total amount of air supplied to all zones from the air supply system, and the number of heating or cooling units in operation. Set point temperature for a particular zone is compared with actual temperature to generate a target velocity signal proportional to the temperature error. The target velocity signal is compared with actual flow velocity measured by the zone velocity sensor, and the difference between target and sensed velocity is employed to operate an air flow control damper valve until velocity of air flowing into the temperature control zone is equal to the target velocity. For control of total air delivered to all zones, the sum of all sensed zone air flow velocities is subtracted from total fan output capacity, and the difference bypassed through a supply system bypass duct, which it self includes a bypass velocity sensor. For control of the number of heating or cooling units in operation, total output fan capacity is divided into a number of overlapping ranges, and the total air flow demand, as determined by the sum of all sensed zone velocities, is compared to the several ranges, causing a single cooler/heater unit to operate when the total air flow demand is in a first lower range, causing two cooler/heater units to operate when the total air flow demand is in a second higher range, and similarly adding additional cooler/heater units as the total air flow demand increases to third and higher ranges. An air flow velocity sensor has a temperature responsive heat generator that is cooled by flow of cooling air over a heatsink connected to the generator and has its output compared with a reference which responds to ambient air temperature variation.
REFERENCES:
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patent: 4487363 (1984-12-01), Parker et al.
patent: 4531573 (1985-07-01), Clark et al.
patent: 4533080 (1985-08-01), Clark et al.
patent: 4553696 (1985-11-01), Ichikawa et al.
patent: 4583683 (1986-04-01), Adachi
patent: 4585163 (1986-04-01), Cooley et al.
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