s219
Super Member
- Joined
- Dec 7, 2011
- Messages
- 8,548
- Location
- Virginia USA
- Tractor
- Kubota L3200, Deere X380, Kubota RTV-X
The geothermal heat pumps intrigue me. I heat with wood but have a traditional heat pump. Wife can not feed the wood stove due to health issues so the heat pump does get some use. While we do not get much cold, cold weather here, the defrost cycle on the outdoor unit drives me crazy from a noise standpoint. Are the geo wells drilled in a traditional manner as a water well is? My house is literally 50 from the beach (salt water) so there should be plenty of thermal absorption capacity down there relatively shallow. Since they do not draw water or discharge anything I would not think the county would care where the wells went but they would probably find a reason. What is in the ground in bottom of the wells? A coil of some sort?
Some geo systems only have a ground loop, and no wells -- they would just dig a long trench and lay pipe, or a wide pit and lay coiled pipe. Typical pipe is just black poly tube, same as you'd use for water/irrigation/etc.
My geo system has four wells about 120' deep. Was drilled similar to a regular well, but without casing. At the bottom, there is a "U" elbow that is sonic-welded to the tubing (before it was shoved down the well). Once the pipe is down the well, the well is grouted with bentonite. This makes good thermal conduction with the earth and also serves to seal off the well from contamination. Even though the geo system is sealed, there is a threat to groundwater/aquifer contamination from drilling any well, and that's probably the biggest concern as far as environmental/health department permitting etc.