It is based on place deep underground (at least 2m) in the form of heat exchanger tubes with large diameter (eg 200mm) or gravel deposits . More »
Ni kwa kuzingatia mahali kirefu chini ya ardhi (angalau 2m) katika fomu ya zilizopo exchanger joto na kipenyo kubwa (kwa mfano 200mm) au amana changarawe . More »