Geothermal energy system using pit in earth - has surface heat exchanger to recover heat from steam evaporated in pit

摘要

A deep pit inthe earth contains several vertical tubes from the surface. Fuel falls through one tube to drive a generator by kinetic energy before entering a combustion chamber. Air is blown into the combustion chamber by a fan at the surface through another tube. Water descends a further tube and drives a generator by kinetic energy before passing into the combustion chamber where it is evaporated. The steam rises in a separate tube to a heat exchanger on the surface. The heat is transferred in this to a transport fluid which drops in a smaller tubeto preheat the water before it is evaporated.