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• W93188049 abstract "This thesis analyzes binary cycle power plants (Organic Rankine Cycles) for electricity generation from low enthalpy geothermal resources. The objective is the maximization of the net power output by means of the proper selection of the working fluid and cycle parameters. A critical review of many studies on ORCs in the scientific literature is carried out to provide a basis for an optimization study having the exergy recovery efficiency as objective function. Two working fluids are analyzed taking into account both supercritical and subcritical pressures and different temperatures of the geothermal fluid. The application of advanced techniques derived from Pinch Analysis (HEATSEP method) allowed finding also sub-optimal solutions, corresponding to small deviations of the cycle parameters from the optimal design values. These solutions, although sub-optimal from a thermodynamic point of view, may be selected when different aspects related to the technology, economics, flexibility or safety of the system are considered. The costs of the optimal thermodynamic solutions are estimated using the module costing technique that relates all capital and operating costs to the purchased cost of equipment evaluated for some base conditions. The economic results show the impact of the geothermal fluid temperature and working fluid selection on the economics of the system. The results of this study are applied to the Stillwater real binary cycle power plant that started operating in 2009 in Nevada (USA). The power plant operates at subcritical pressures with isobutane as working fluid and uses a dry cooling system as heat rejection system. Due to the limited geothermal resource the plant net power output is much lower than expected. A detailed off-design model of the power plant is developed using the software Aspen. The model is tested and adjusted against the plant data collected during the first year of operation. After validation, the model is run to evaluate the operating parameters that maximize the annual energy production. A study is then performed to increase the performance of Stillwater geothermal binary power plant with the addition of the solar source. The combination of the high exergy solar resource with the low exergy geothermal resource could provide many benefits such as the improvement of the thermal efficiency and the increase of the power output during the day and especially during the warm season, a time when the energy production of air-cooled geothermal power plants is markedly reduced. The addition of the solar heat in the Stillwater geothermal plant restores operating conditions close to design point also in presence of reduced geothermal flow rate and temperature. The detailed off-design model of Stillwater power plant is used to carry out this hybridization study. Cycle parameters are optimized for different values of the ambient temperature and solar irradiation in order to maximize the annual energy production. Two different designs of hybrid geo-solar plants, with and without storage, are compared, and the levelized cost of electricity (LCOE) of the incremental generation from solar energy is calculated. As expected, this LCOE is quite high due to the high costs of the solar collectors and could be competitive only in presence of appropriate incentives." @default.
• W93188049 created "2016-06-24" @default.
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• W93188049 date "2011-01-31" @default.
• W93188049 modified "2023-09-27" @default.
• W93188049 title "Analysis and Development of Innovative Binary Cycle Power Plants for Geothermal and Combined Geo-Solar Thermal Resources" @default.
• W93188049 hasPublicationYear "2011" @default.
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