Wasted hot air (considered as an ideal gases) with a temperature of 627 o c (state 1), flows at 2.0 kg/s through an adiabatic heat exchanger (which is a closed heat exchanger & no mixing), leaving at 377 o c (state 2). it exchanges heat with the stream of water entering at 7 bars and h3=697.22 kj/kg (state 3), assuming each line flow steadily, and negligible of kinetic and potential energy changes. solve and answer both case i and case ii. (all sub-questions are 4 points, except 6 points of each sketch). t (k) = t(o c)+273. case a only