Control system for air quality and temperature conditioning unit with high capacity filter bypass
First Claim
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1. An air conditioning unit comprising:
- a housing having an inlet opening and a discharge opening;
a filtration system, positioned within said housing, for filtering supply air traveling through a first passageway between the inlet and discharge openings, said filtration system having means for removing volatile organic compounds from said supply air;
a fan mounted within said housing for directing inlet air into the unit through said inlet opening and discharge air, out of said unit, through said discharge opening;
a bypass for routing inlet air through a second passageway between said inlet and discharge openings bypassing said filtration system; and
a flow control device for controlling a percentage of said inlet air passed through each of said first and second passageways based upon a quality of said inlet air.
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Abstract
An air conditioning unit is provided with a high capacity filtration system for removing pollutants from supply air, typically return air which has been recirculated from the conditioned area. A filter bypass passage and suitable flow control devices are provided so that supply air, typically fresh outdoor air, may be routed around the filtration system when minimal or no filtration is required. An air quality detector samples the air quality and positions the flow control devices to effect the most cost efficient operation of the air handling unit under the given operating conditions.
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Citations
13 Claims
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1. An air conditioning unit comprising:
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a housing having an inlet opening and a discharge opening; a filtration system, positioned within said housing, for filtering supply air traveling through a first passageway between the inlet and discharge openings, said filtration system having means for removing volatile organic compounds from said supply air; a fan mounted within said housing for directing inlet air into the unit through said inlet opening and discharge air, out of said unit, through said discharge opening; a bypass for routing inlet air through a second passageway between said inlet and discharge openings bypassing said filtration system; and a flow control device for controlling a percentage of said inlet air passed through each of said first and second passageways based upon a quality of said inlet air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An air conditioning unit comprising:
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a housing having an inlet opening and a discharge opening; a filtration system, positioned within said housing, for filtering supply air traveling through a first passageway between the inlet and discharge openings; a fan mounted within said housing for directing inlet air into the unit through said inlet opening and discharge air, out of said unit, through the discharge opening; a bypass for routing inlet air through a second passageway between said inlet and discharge openings bypassing said filtration system; a flow control device for controlling a percentage of said inlet air passed through each of said first and second passageways based upon a quality of said inlet air; and means for determining an incremental filtration cost corresponding to an incremental increase in an amount of inlet air passed through said first passageway and through said filtration system, said flow control device admitting said incremental increase of inlet air through said filtration system when said incremental filtration cost falls below a predefined level.
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10. An air conditioning unit comprising:
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a housing having an inlet opening and a discharge opening; a filtration system, positioned within said housing, for filtering supply air traveling through a first passageway between the inlet and discharge openings; a fan mounted within said housing for directing inlet air, comprised of outside and return air, into the unit through said inlet opening and discharge air, out of the unit, through the discharge opening; a bypass for routing inlet air through a second passageway between said inlet and discharge openings bypassing said filtration system; a flow control device for controlling a percentage of said inlet air passed through each of said first and second passageways based upon a quality of said inlet air; means for determining a dilution preferred percentage change in an amount of outside air admitted and a filtration preferred percentage change in an amount of inlet air passed through said first passageway and said filtration system; and means for adjusting said unit based upon one of said filtration and dilution preferred percentage changes depending upon a quality of said outside air.
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11. An air conditioning unit comprising:
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a housing having an inlet opening and a discharge opening; a filtration system, positioned within said housing, for filtering supply air traveling through a first passageway between the inlet and discharge openings; a fan mounted within said housing for directing inlet air, comprised of outside and return air, into the unit through said inlet opening and discharge air, out of the unit, through the discharge opening; a bypass for routing inlet air through a second passageway between said inlet and discharge openings bypassing said filtration system; a flow control device for controlling a percentage of said inlet air passed through each of said first and second passageways based upon a quality of said inlet air; and means for determining an incremental energy cost corresponding to an incremental increase in an amount of outside air admitted to form said inlet air, said flow control device maintaining said percentage of inlet air, passed through each of said first and second passageways, constant and admitting said incremental increase of outside air when said incremental energy cost falls below a predefined level.
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12. An air conditioning unit comprising:
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a housing having an inlet opening and a discharge opening; a filtration system, positioned within said housing, for filtering supply air traveling through a first passageway between the inlet and discharge openings; a fan mounted within said housing for directing inlet air into the unit through said inlet opening and discharge air, out of the unit, through the discharge opening; a bypass for routing inlet air through a second passageway between said inlet and discharge openings bypassing said filtration system; and a flow control device for dividing flow of said inlet air between said first and second passageways in proportion to a seused quality of said inlet air, wherein said first passageway receives a first percentage of said inlet air and said second passageway receives a second percentage of said inlet air. - View Dependent Claims (13)
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Specification