Staged power exhaust for HVAC air handling units
First Claim
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1. 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; and
a 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.
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Abstract
An air handling unit for a heating, ventilating and air conditioning system of a building has a plurality of exhaust fans. The exhaust fans are sequentially activated in response to the amount of air flowing into the air handling unit from outdoors. Thus the amount of air exhausted from the building approximates the amount of air drawn into the building through the air handling unit. This operation maintains the static air pressure within the building to acceptable levels.
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Citations
21 Claims
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1. An air handling unit for a environmental control system for a zone of a building, the air handling unit comprising:
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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; and a 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. - View Dependent Claims (2, 3, 4, 5)
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6. An air handling unit for a environmental control system for a zone of a building, the air handling unit comprising:
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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 plurality of N fans connected to the exhaust air outlet, where N is a plural integer; and a control circuit which sequentially activates each of the plurality of N fans in response to different amounts of air flowing through the outdoor air inlet. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An air handling unit for a environmental control system for a zone of a building, the air handling unit comprising:
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an outdoor air inlet adapted to receive air from outside the building; a supply air outlet adapted to supply air to the zone of the building; a supply passage connecting the outdoor air inlet to the supply air outlet; return air inlet adapted to receive air from the zone of the building; an exhaust air outlet; a return passage connecting the return air inlet to the exhaust air outlet; a recirculation passage connecting the return passage to the supply passage; an outdoor air damper controlling air flow through the outdoor air inlet by opening and closing; a recirculated air damper controlling air flow through the recirculation passage by opening and closing; a plurality of N fans connected to the exhaust air outlet, where N is a plural integer; and a sensor assembly connected to the plurality of N fans, wherein the sensor assembly activates the fans in response different amounts of air flowing through the outdoor air inlet. - View Dependent Claims (18, 19, 20, 21)
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Specification