| Title | Economic Analysis -Preliminary Considerations for Power Generation Using a Downhole Coaxial Heat Exchanger System (IV) |
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| Authors | Fujita, T., Jinno, T., Myoda, T., Morita, K.,Yamaoka, K. |
| Year | 1988 |
| Conference | Japan International Geothermal Symposium |
| Keywords | |
| Abstract | A downhole coaxial heat exchanger (DCHE) system as illustrated in Fig. 1 was proposed as a new geothermal energy extraction system. A series of studies (Morita and Sugimoto, 1988;Sugimoto and Morita, 1988;Yamada et al. • 1988) were carried out on power generation using the DCHEs for the specified well design and temperature distribution in the formation. The purpose of these studies is to clarify at what thermal output or effective thermal conductivity of the formation the system becomes economical. The four effective thermal conductivities of the formation were assumed and thermal output of the DCHEs was estimated by computer simulation (Morita and Sugimoto, 1988). Assumed effective thermal conductivities are 2.7, 10. O. 20. O. and 30.0 kcal/mh C. A combination of two-phase turbine and stea~ turbine was selected as a power generation system and the change of net power output was estimated (Sugiaoto and Morita. 1988). The DCHEs and surface facilities were designed (Yamada et al. ,1988). In the present study, costs for prospect, DCHEs, Fpower plants and related facilities were estimated. Then the power generation cost was estimated for each effective thermal conductivity of the formation. |