My 100 foot well went 'dry' {silted, I believe}. I has at least a 50ft column of water in it. Can I use it to draw geothermal heat to warn the air I will use in a heat exchanger to bring fresh air into my house and to help mitigate Radon {a little] in my basement? My idea is to take water out and run it throgh a heat exchanger then dump it right back in the 'well' to be reheated by geothermal heating. as a supplemental heating source can it work/
You need TWO wells for Geo heating not one. You draw from one and discharge to other and they need to be at least 100 feet apart and the source is always lesser depth than the discharge well. You need at least a 4 inch well wherein you can install a suitable pump inside the well. The well must be capable of sufficient capacity to satisfy the heating requirements. Here is how to calculate that for the available heat from a well . Heat(in BTU)=# water x 10 and water weighs 7.5 gallons per gallon. The 10 is if you can drop the temp of water 10 degrees in your heat exchanger. That is a common design parameter (50 in - 40 out) since 50 is the temp of ground water and 40 is the water temp after extracting heat. The basic definition of a BTU is the amount of heat necessary to raise one # of water ONE degree F. So you can do a rough calculation yourself to determine just how much water you need to pump from the source well in gallons per hour based on your average demand for heat in the house in BTU per hour. .
I doubt 100 ft is deep enough to heat anything.
