EXAMPLE 10 . An air-conditioning system involves the mixing of cold air and warm outdoor air before the mixture is routed to the conditioned room in steady operation. Cold air enters the mixing chamber at 17C and 125 kPa at a rate of 0.85 m3/s while warm air enters at 45C and 125 kPa. The air leaves the room at 20C. The ratio of the mass flow rates of the hot to cold air streams is 2.Determine (a) the mixture temperature at the inlet of the room and (b) the rate of heat gain of the room