| abstract |
Into the empty lining pipe (13) is inserted a hose (21) with a closed bottom end, and a downwards open centre tube (25) is pushed into the hose. The latter is filled with a liq. of good thermal conductivity, at least partly, and is expanded like a balloon by the liq. static pressure. Alternatively the hose is expanded by superheated steam until it abuts the lining pipe. At the transition (A) between the expanded and flat hose section, the annular space (9) is filled with liq. or solid material of good thermal conductivity. Pref. liq. sealant is pressed into the annular space from below to the top. USE/ADVANTAGE - For ground heat utilisation, with a facility to reach large depth, and optimum heat transfer. |