On 23 Nov 2014 17:49, "Poul-Henning Kamp" <[email protected]> wrote: > > -------- > In message < canx10hb0kdrnaayzgvm1gkduj7gklth0acdxczg894hxbus...@mail.gmail.com> > , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes: > > >He installs ground source > >heat pumps for the geothermal energy. He says that they actually work > >quite poorly in many cases. > > There is a BIG difference between geothermal and ground heating. > > Geothermal means you drill at least 50m (Iceland) or more likely > half a kilometer down, in order to harvest water at near boiling > point from the Earths geological heat-sources (mostly uranium decay).
Sorry. What he installs is pipes in the ground in residential or industrial sites. Basically he says they work initially, but performance drops dramatically over a couple of years. > If you extract more energy than you deposit sunshine, you end > up freezing a larger and larger volume of water/soil around > the pipe and your compressor will eat a lot of electricity. That is what he was saying. Dave. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
