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.