Erkenntnisse aus dem Betrieb einer teilgedämmten Erdwärmesonde: Einsatzmöglichkeit für die Eisfreihaltung von Verkehrsflächen

Standard systems of borehole heat exchangers use a simple construction, in which the supply and the return line are not thermal insulated from each other. Therefore a part of the heat obtained in the depth is lost during reflux to the surface. An insulation of the return line may avoid this temperature loss. Such an insulated borehole heat exchanger has been used in this project to examine the effect in comparison to a standard borehole heat exchanger. The effectivity of the insulation has been proofed by the measuring results. In a phase without operation of the heat pump during winter 2016/17 a difference of temperature between the supply line and the return line was measured resulting in a free convection in the insulated borehole heat exchanger. This self-induced flow can be used to increase the effectivity and economic efficiency of ice-avoiding-systems in traffic surfaces.