Underground drainage duct with heat reclamation fitting has open channels provided in the base of the duct profile for subsequent fitting of heat exchange pipes

摘要

An underground drainage duct has a conventional cross section with a flat base (4) and with the bottom of the profile provided with a drainage channel (2). The channel is extended by smaller open channels to take optional heat exchange pipes. These are fitted after the drainage sections have been laid between access shafts and comprise stainless steel square section pipes laid as a single duct or as a parallel duct set. The stainless pipe sections are welded together above ground and slid into place in the drain where they are secured by a viscous bonding agent.