A flow of moist air at 21C, 60% relative humidity should be produced from mixing of two different moist air flows. Flow 1 is at 10C, relative humidity 80% and flow 2 is at 32C and has Twet = 27C. The mixing chamber can be followed by a heater or a cooler. No liquid water is added and P = 100 kPa. Find the two controls one is the ratio of the two mass flow rates ma1/ma2 and the other is the heat transfer in the heater/cooler per kg dry air.