GROUND HEAT EXCHANGER

摘要

A ground heat exchanger (2) comprises a flow leg (3), a heat ex¬ changer leg (4), an upper manifold (7) and a lower manifold (10) to be positioned at the bottom of the borehole d). The flow leg extends from the upper part of the borehole (1) to the lower manifold (10). The heat exchanger leg (4) comprises an outlet pipe (5) extending upwards from the upper manifold and a plurality of heat exchanger pipes (6) between the upper manifold and the lower manifold. The lower manifold connects the flow leg and the heat exchanger leg. The upper manifold comprises a body (13) forming a fluid space (14), a connection (15) from the fluid space to the outlet pipe and a plurality of connections (16) from the fluid space to the heat exchanger pipes. The flow leg is arranged to go through the fluid space of the upper manifold. The distance between the centre axis (A) of the flow leg and the centre axis (B) of the upper manifold may be different in the up¬ per part of the manifold than in the lower part of the manifold. The upper manifold may comprise a conduit pipe (17) through the fluid space of the body and the flow leg may be arranged to go through the fluid space inside a conduit pipe.