Posted by Janicholson on March 01, 2014 at 06:09:07 from (74.60.94.18):
In Reply to: Re: frost line? posted by George Marsh on March 01, 2014 at 05:23:02:
THe selection of earth heat depends on that question. The answer is arrived at through consideration of soil type, and climate zone/frost depth. 15 feet is not uncommon with a horizontal grid of collection tubing in cold locations. Other options include one way pumped well source (pretty common where the outflow can get percolation back to the aquifer). another is two wells separated by several feet or in some cases yards that draw from one and inject into the other, a recommended practice where wasting ground water would be a very bad idea. and one other where water level in a well is 20' or so above the bottom of the casing, is to usw a down the well heat exchanger with pumped fluid in the exchanger. I hope this helps, earth temps vary from about 50 degrees at 3 meters, to 60 degrees at 3 meters in southern areas of the US. There are charts, my numbers are approximate and local measurements are easy to make in a well casing. Jim
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