1. The problem statement, all variables and given/known data I'm trying to determine how to go about attacking this problem that I'm doing to I have 2 streams of air mixing, and I'm trying to find the temperature and relative humidity of the third stream. Stream 1: 2bar, 20C, 40%rh, and 1kg/s Stream 2: 1bar, 20C, 4kg/s So I know I can find all my values for the first stream, but the second stream doesn't give me enough to find it on the psychometric charts. 2. Relevant equations m=mass of mixture ma=mass air mv=mass vapour h=enthalpy of mixture ha= enthalpy dry air hv=enthalpy of water Mass Balance m1+m2=m3 ma1+ma2=ma3 mv1+mv2=mv3 m=ma+mv Energy balance m1h1+m2h2=m3h3 and all variations of this with the contents of the air phi1=rh=Pv1/Pg1 where phi is the relative humity Pv1 is the partial pressure of water Pg1 is the saturation pressure of water at the given temperature w=mv/ma for all values. energy=mc(delta)T where c is the constant used to determine this (name escaping me right now) (units of kj/kg.C) 3. The attempt at a solution I got my values for state one, I've tried energy balance and mass balance, but I end up with more variables than equations and I've been confusing myself all day trying to do this. I can't find ANY question in over 3 books that excludes all data about state three other than the mass flow rate, and excludes the data required from the second stream of air.