Abstract: A polymer geothermal collector (1) for extracting geothermal energy from a well (W). The polymer geothermal collector (1) being configured to be placed in the well (W) for enabling circulation of a fluid in the polymer geothermal collector (1) for performing heat exchange between the fluid in the polymer geothermal collector (1) and the well (W). A first and second portion (1?,1?) of the polymer geothermal collector (1) each have a curved outer surface (OS) configured to face an inner surface (IS) of the well (W), and the polymer geothermal collector (1) further comprises a hydrophilic swelling material (14) disposed between the first and second portions (1?,1?) of the polymer geothermal collector (1).

Abstract: The present invention relates to a single pipe collector for a heat pump installation. The collector comprises a pipe (12) intended for installation in a heat pump plant, in which pipe a heat transfer liquid circulates in a closed cycle for conveyance of heat that is absorbed from a heat source to a heat pump and return of the heat transfer liquid back to the heat source. The inward surface (14) of the pipe has an uneven surface structure that comprises indentations and/or elevations (16). The present invention also relates to heat pump plant comprising the collector.

Abstract: A collector for a heat pump installation includes a pipe to circulate a heat transfer liquid between a heat source and a heat pump. An inner surface of the pipe has an uneven surface structure that includes at least one of indentations or elevations extending helically in a longitudinal direction. The indentations or elevations are arranged to create a turbulent flow of the heat transfer liquid in the pipe.

Abstract: A geothermal pipe collector is provided. The geothermal pipe collector is made from a polymer composition including more than 50 wt % polyethylene, 0.1 wt %-35 wt % talc and 0.5 wt %-10 wt % carbon black.