Q1. Air at 15 ° C and 25 percent humidity is to be heated in two stages with intermediate saturation with water to 80 percent humidity so that the final stream is at 45 ° C and 25 per cent humidity....

Q1. Air at 15 ° C and 25 percent humidity is to be heated in two stages with intermediate saturation with water to 80 percent humidity so that the final stream is at 45 ° C and 25 per cent humidity. What is the humidity of the exit stream and the conditions at the end of each stage?