Economizer Free cooling concept

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Hi, When we are doing free cooling of workspace using ambient fresh air and cutting of chilled water,what will be the best way to exhaust excess fresh air taken from outside. Solution details. we get in 70% of fresh air when ambient temperature/humidity are less than set points and regulate the chilled water which reduces energy consumption. right now we are not controlling the return air damper based on fresh air damper opening so there is high chance of air mixing which dilutes the purpose.We used exhaust fan with motorized damper to relive the air from work space so quantity of air returning will be less.This was due to the limitation in the building. Can some one suggest the way  what we are doing is right or is there a better way to do it without degrading the aesthetic of the building.   Regards Anish Kumar
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Asked On June 19, 2017 10:49 AM
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