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A solution is what I am looking for. As it has been a while since I am out of engineering school, and have no ready access to the calculations, I was hoping for a little help.

Is there anyone out there that can help me answer a question I have related to solar heating of water. - There is a 1" diameter x 4' long glass tube filled with water having an input temperature of 250F. - There is a 2" diameter tube surrounding it, 4' long, filled with water coming from...