Patent ID: 6126540
Filing Date: 2000-10-03
Classification: F24F,Y02B

Abstract:
An air handling unit for a environmental control system for a zone of a building, the air handling unit comprising:an outdoor air inlet adapted to receive air from outside the building;a supply air outlet connected the outdoor air inlet to receive air therefrom and being adapted to supply air to the zone of the building;return air inlet adapted to receive air from the zone of the building;an exhaust air outlet connected to the return air inlet;an outdoor air damper coupled to the outdoor air inlet and controlling air flow through the outdoor air inlet;a recirculated air damper connected between the return air inlet and the supply air outlet for controlling air flow there between;a N fans connected to the exhaust air outlet, where N is a positive integer; anda control circuit which sequentially activates each of the N fans in response to an amount of air flowing through the outdoor air inlet, where each fan is designated by a different integer X from 1 to N, wherein a given fan X is turned on when the air flow is substantially X/N+1 of the maximum air flow through the outdoor air damper.