Corrosion and scaling resistant geothermal heating installation, use two coaxial tubes outer one stainless steel inner one plastic

摘要

Uses an insulating material, covering a second tube, whose thermal conductivity decreases in a forts direction going from the installation depth up to ground surface. The second tubes wall thickness increases in the first direction. The calorific fluid circulates in a closed loop. A thermal exchanger has an input connected to the second tubes output and an output connected to an input of a first tube. Geothermal installation including a buried conduit. The installation is designed to form heating pits and the conduit is formed by a first drilled tube in which a second tube is coaxially fitted. The first tube, which forms a first channel, is fabricated from a thermal conducting material and the second tube, which forms a second channel is insulated. An access from the first to the second channel is made at a place in the section of conduit near the bottom of the heating pit, so that a heating fluid can penetrate into the second channel.