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Re: geothermal + no compressor
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Posted by Ethan on Monday, 5 July 2010, at 6:43 p.m.,
in response to geothermal + no compressor, posted by jimbo500
On the surface your thoughts work. There are plenty of buildings that are heated by hot water boilers and cooled by chill water. The question is can you meet the heating and cooling goals only using ground water? Let's say that you want to maintain a constant 70F in the house. Some items to take into consideration. In order to transfer heat into or out of the water there would need to be a delta T of at least 2F. In the coolong season there is typically a need to remove both sensible heat and latent heat (humdity). To remove humdity the coil temperture needs to be lower. In commercial applications using chill water the water temperture needs to be around 40 to 50F to deal with humidity in the summer time. In the winter humidity is normally not an issue but in order to feel comfortable the air discharge temperature needs to be fairly high. Remember the original heat pumps that discharged low temperature air? There were a lot of complaints about the "cold" air blowing out of the registers. So at this point we are looking at needing source water that is less than 55F in the summer and better than 85F in the winter. The 55F water in the sumer may be possible but an 85F winter source would be hard unless you live over a thermal vent (hot spring). A typical home AC unit is 3 tons ot 36,000 BTU/hr if we assume a 5 degree F DeltaT (55 to 60F) then at max load we would need 15 gmp of 55F water to produce 57F air.
More later
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