| 摘要 |
The present invention relates to heat exchanger to be introduced in a bore hole in rock, loose earth or the similar. According to the invention the heat exchanger comprises a first tube (1) having a circular cross-section and a second tube (3) having a first wall (4) extending substantially around the whole periphery of the first tube (1), a seocnd wall (5) extending outside the first wall at some distance from this and two end walls (6, 7) which connect neightbouring ends of the first and second walls to each other, which second tube is made of a flexible material whereby a pressure introduced in the space between the first and second walls of the second tube leads to that the distance between these increases, and of a device to connect the bottom end of the first tube with the bottom end of the second tube in such a way that a fluid can flow between the tubes. |
