David, thanks for the math, how did you decide on 3 degrees temperature rise?
A decent reverse flow heat exchanger the outlet temperature of the water should approach the inlet temperature of the air, but lets say you only get half way there and the air going in is 80F and the water in is 60F, the temperature rise of the water would be 10F.
Not nitpicking, but it is an interesting first year engineering question.
FYI the farm house my parents had in central Pa, had a cooling trough in the basement, water came through the wall from a spring and went out through a drain pipe on the other side of the basement.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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