| 摘要 |
A heat exchanger for a circulating geothermal ground loop has an inlet 1, an outlet 2 and a coil 3 arranged therebetween. The coil can be of helical form, and the heat exchanger is installed in a geothermal borehole 4. The helical coil arrangement is formed around a core of thermally insulated material 6, and the outlet pipework is also encased within a thermally insulated material 22 throughout the rising length of the return pipework in the borehole. The arrangement can further include a support frame structure 5 which maintains a defined separation between the helical coil and the core of thermally insulated material. In use, the insulated core provides a heat transfer barrier between the helical coil and the fluid return pipework, but yet the support frame structure provides space between the coil helix and the insulated core to permit contact with a geothermal grout or borehole backfill material and the coil. The heat exchanger can be a part of a geothermal energy system, such as a closed loop ground-source heat pump. |
