Hi all! I'm working on a project of heating water from exhaust gases of kamin's chimney. I have a cross flow heat exchanger (see pdf). we have done calculations of heat transfer rate and the outlet temerature of the water, and got 150C. so it probably gets boiled somewhere inside the HX. I need to do further calculation which will consider 2 phases of the water and new outlet water temperautre and heat transfer rate. Does anyone can give me a direction?