30. Your answers to A through E shall be done on a psychrometric chart (attach with your answers). An air system has been sized with indoor design conditions of 78F DB / 65F WB; outdoor conditions of 95F DB / 75F WB; a room sensible heat gain of 156,000 Btu/hr and room latent heat gain of 39,000 Btu/hr; and 25% outdoor air: a. Plot the indoor and outdoor design conditions on the psychrometric chart. b. Find the mixed-air conditions entering the cooling coil. C. Draw the Sensible heat ration line. e. f. d. Determine the coil leaving-air conditions assuming a leaving air saturation of 90%. Determine the enthalpy difference between the entering and leaving-air conditions. Calculate the refrigeration load in tons: Tons Extra credit question for Part 1: An air conditioning system has been designed and is based upon a heat gain of 275,400 BTU/HR sensible load, and a latent load of 42,800 BTU/HR. The designer has determined that the space is to be maintained at 72 degrees while delivering 55 degree air through the ductwork. Calculate the total air quantity (in CFM) required to be delivered to cool the space.