Abstract
A technique for absorbing low-grade heat from the ground for a ground source heat pump is described. Refrigerant is directly evaporated in U-tubes penetrating to a depth of 10 m to form the heat pump evaporator. An installation with 16 U-tubes and a heat output of 8–9 kW has been completed, with the heating demand being provided by a house. The details of the installation and experiments on system reliability, performance and effects on soil conditions are described.
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