Thermodynamic analysis of geothermal energy systems with forced recovery from aquifers Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z890rx47q

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  • A thermodynamic analysis of forced geoheat recovery from aquifers has been accomplished. The system investigated consists of a single recharging-discharging well pair, in a horizontally extensive aquifer, with either power generation or space heating as surface applications. The space heating systems investigated are (i)direct heating, (ii)heat pumps and (iii)a combination of direct heating and heat pumps. The thermodynamic performance parameters considered are the effectiveness (Second Law Efficiency) and fossil fuel savings. Previous work on this problem has considered only the surface system with a specified temperature at the wellhead. Also, in the previous work, the surface system was either power generation only or heating only. This thesis includes the subsurface system in the analysis and the surface application of this work is treated as an important parameter. Due to the interaction between the surface and subsurface systems, the load conditions and geologic conditions play important roles in determining the optimum operation. The analysis indicates that the well separation should be large enough to insure a constant production temperature during the project life time. For high temperature resources(higher than about 435 K), power generation yields the best performance and is therefore recommended. The relative desirability of the combination (heating and heat pumps) requires consideration of the load condition, resource temperature and other geologic conditions. Such evaluations for these automatically determine the appropriate ranges of direct heating. The optimum operation of each system is also dependent on the same parameters as well as the injection temperature. Analysis also has been done on a given well system with a small well separation. In such a case, operation must be continued after thermal breakthrough in order to obtain a moderate output for the life of the system. Power generation and the combination do not have good performance with this model. Direct heating, with careful control of flow rate, appears to be the preferred system. For low temperature resources, heat pumps can only be used with careful control of the flow rate and injection temperature.
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  • description.provenance : Approved for entry into archive by Deborah Campbell(deborah.campbell@oregonstate.edu) on 2013-07-30T23:00:36Z (GMT) No. of bitstreams: 1 LeeSeK1983.pdf: 3101997 bytes, checksum: 10770b794f73e9ae6474473911c27ddc (MD5)
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