Air handling unit including control system that prevents outside

Details Air handling unit including control system that prevents outside Air handling unit including control system that prevents outside

1996-02-12

1998-08-11

Ford, John K.

Heat exchange

With timer, programmer, time delay, or condition responsive...

Having heating and cooling capability

165248, 165249, 165251, 165 59, 236 493, 454239, 454229, 454236, F25B 2900

Patent

active

057914087

ABSTRACT:
A control system for controlling an air handling unit. The control system links the position of an exhaust air damper and a recirculation air damper so as the exhaust air damper is opened, the recirculation air damper is closed the same amount, and vice versa. An outside air damper remains completely open at all times. The relative positions of the exhaust air damper and the recirculation air damper control the amount of outside air that is emitted into the air handling unit through the outside air damper. For each of the control states of heating with minimum outside air, cooling with outside air, mechanical cooling with maximum outside air, and mechanical cooling with minimum outside air, the outside air damper remains completely open, and the position of the exhaust air damper and the recirculation air damper are controlled based on a particular state. Sequencing strategies are employed for transitions between the control states that utilize these positions of the dampers.

REFERENCES:
patent: 4491061 (1985-01-01), Nishizawa et al.
patent: 4506514 (1985-03-01), Lamar et al.
patent: 4705457 (1987-11-01), Belusa
Dickson, Dale K. P.E. et al. "Economizer control systems," ASHRAE Journal, 28:9, pp. 32-36, Sep. 1986.
Hays, Steve M. et al. "Indoor Air Quality Solutions and Strategies," Mechanical Engineering and IAQ, pp. 132-137 and 200-203.

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