Eric, Here is the theory behind BTU's. One BTU is the energy to change the temperature of one pound of water 1 degree. So let's say you have 50 degree water and you lower it's temp to 40 degrees, that's 10 BTU's / pound of water. On the other hand if you have 50 degree water and you warm it up to 60 degrees, then you have 10 BTU's of cooling. So it's really a simple math problem, how much heat exchange do you get in both your pipe and radiator and the volume of water you are pumping. 8.34 pounds/ gallon/ Your major problem will be freezing up in the winter.
In 2000 my A/C compressor went bad. System was 30 years old. I needed cooling and it was in the middle of August and I had to go back to work. It took about 10 days before a new A/C could be installed. I pulled the old A coil out, and installed a used 3 ton A coil. Rigged up garden hoses and passed the water through the cap tubes like it was freon and ran the fan constantly. It kept the house comfortable enough for my wife, who at the time was on oxygen 24/7. The down side to using 55 degree well water is it's not cold enough to remove moisture like an A/C.
This idea isn't a new one, Carrier did it in about 1905. I think Jefferson or Jackson had a house by Nashville, Tn, that was cooled with spring water running through pipes and slaves operated the bellows to move the air.
I've always wanted to do this again, using large condensor and evaporator coils from commercial units, however the price of scrap is too much.
You are going to needs tons of water to heat or cool your building. Plan big. Let us know how it works. It may be better to use a well and dump the water on your lawn, field or garden.
A ton of water per hour, 2000 pounds, change the temp 10 degrees, and you have 20,000 BTU's/hour. That's not much for the size of building you have. Depending on your heat exchange rate, you may need 2 or 3 ton per hour.
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