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On an uncomfortable summer day, the air is at 87 F and 60 % relative humidity. A laboratory air conditioner is to deliver 1.0 x 10 ft/min of air at 65 F in order to maintain the interior air at an average temperature of 75F and a relative humidity of 40%. Reference Materials Physical Property Tables Psychrometric chart Sl units Reference sates: H20 (liquid, 0C, 1 atm) dry air (0C, 1 atm). (Data obtained from Carrier Corporation.) Psychrometric chart- U.S.customary units Reference sates: H20 (liquid, 32F, 1 atm) dry air (0F, 1 atm). (Data obtained from Carrier Corporation.) Closed Vent If the vent switch is set to the "closed" position (as it normally would be), inside air would be recirculated throgh the air conditioner as shown in the following diagram. Recirculated room air, 75F h, = 40% Exhuast 75F h, = 40% AIR CONDITIONER Delivered air REHEATER Q (tons) C OF LAB 75F h, = 40% Outside air COOLER AF h, = B % Condensed water Assume A = 87 F, B = 60%, C = 65 F. The recycle ratio (ft recirculated/ft? exhausted) is 2:1. Calculate the condensation rate and the overall cooling requirement in tons if conditioned air is delivered at the same rate, temperature, and relative humidity as in the first part. What percentage of the cooling load on the air conditioner is saved by recirculating the air? Condensation rate: ! lbm/min Cooling load: i tons Percentage savings: i ! %