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 outside air inlet, a return air inlet and a discharge outlet, said return and outside air combining to form mixed air;
filter means for filtering a portion of said return air;
damper means for varying an amount of return and outside air admitted;
conditioning means for maintaining enthalpy and quality levels of discharge air at desired levels;
control means for determining which is more cost effective to maintain said quality and enthalpy of the discharge air (1) by incrementally increasing an amount of outside air without increasing filtration and (2) by incrementally increasing an amount of filtration without increasing the amount of outside air admitted, said control means adjusting said filter, damper, and conditioning means based on said determination.
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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
5 Claims
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1. An air conditioning unit comprising:
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a housing having an outside air inlet, a return air inlet and a discharge outlet, said return and outside air combining to form mixed air; filter means for filtering a portion of said return air; damper means for varying an amount of return and outside air admitted; conditioning means for maintaining enthalpy and quality levels of discharge air at desired levels; control means for determining which is more cost effective to maintain said quality and enthalpy of the discharge air (1) by incrementally increasing an amount of outside air without increasing filtration and (2) by incrementally increasing an amount of filtration without increasing the amount of outside air admitted, said control means adjusting said filter, damper, and conditioning means based on said determination. - View Dependent Claims (2, 3, 4)
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5. A method for controlling an air conditioning unit that receives outside and return air to form mixed air and discharges supply air having a predetermined minimum quality and maximum enthalpy, said method comprising the steps of:
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receiving adjustable amounts of outside and return air; determining an energy cost required to maintain an enthalpy level of mixed air below a predetermined maximum enthalpy level when a maximum amount of outside air is included; determining a filtration cost required to maintain a quality of said mixed air above a predetermined minimum quality when a maximum amount of return air is included therein; and maximizing the use of outside air when said energy cost is less than said filtration cost.
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Specification