| Title | Down-Hole Coaxial Heat Exchanger Using Insulated Inner Pipe for Maximum Heat Extraction |
|---|---|
| Authors | Morita, Koji; Matsubayashi, Osamu; Kusunoki, Ken-ichi |
| Year | 1985 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Direct Use; Hot Dry Rock; Single Well System; DHE |
| Abstract | A detailed study on a downhole coaxial heat exchanger has been carried out using a numerical simulator for a simplified model of a well. The dependence on the thermal output on certain parameters, such as degree of thermal insulation of the inner pipe, flow rate, inlet water temperature, geothermal gradient and well depth is evaluated. The main result is that an insulating inner pipe could increase thermal output significantly in comparison with a steel inner pipe. |