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Originally Posted by AC_Hacker
I thought your delta-T was pretty good. Did you measure your water flow through your system?
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Yes I did. I filled a bucket in the basement off the return side of the loop and timed it to figure out the flow rate.
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How did you measure your water-in temp, and water-out temp?
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I used an IR thermotmeter on the radiator fins and tubing connected to it.
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And do you know how much cooling you will need?
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Nope. And I'm not sure I really need to. The output of the test was decent. It had a nice cooling effect enough to make things more comfortable. I know it can be improved upon and if I can get any improvement it'll be fine. Its basically an I'll take what I can get scenario. I'm not really looking to put in an A/C system or even a complicated improvement on this system for as little as we would use it.
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Have you calculated how much water flow you'll need for that much cooling?
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Nope, but looking at my current setup it shouldn't be hard to figure out. Double the flow should equal a little less than double the output I imagine.
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Gary has a home heating calculator, that looks like it's based on Manual-J. He might have a cooling version, or you might be able to trick it to calculate your cooling load.
Also, I don't know what your water cost is, but don't neglect the possibility of using a sprinkler on the roof with a timer that could turn it on briefly at fairly frequent intervals during the day. Evaporation really helps.
I suggested this to a convenience store owner. He tried it and said that it lowered his inside temp by 10F. Not too bad.
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I'd definitely like to try this. My main attic is insulated pretty well (R60) and fairly well ventilated. However, the 1st floor addition roof probably isn't as well ventilated and I know its not as well insulated. I bet this could make a real difference there.