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Economical Evaluation of a Low-Enthalpy Geothermal Resource Located in an Arid-Zone Area 被引量:1
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作者 Salah Masheitil brian agnew +1 位作者 Sara Walker Mosbah Talbi 《Journal of Energy and Power Engineering》 2012年第7期1013-1021,共9页
In this work an economical evaluation that established the viability of a low enthalpy geothermal resource as an energy source in north Africa is presented. The factors considered included the payback period, average ... In this work an economical evaluation that established the viability of a low enthalpy geothermal resource as an energy source in north Africa is presented. The factors considered included the payback period, average rate of return, net present value, and net benefit-cost ratio. The model was based on utilising the energy source to energise four models that comprised thermal equipment consisting of water/air cooled single/half effect lithium bromide water mixture absorption chillers and an R-245fa organic Rankine cycle. These modelled cycles were based on the energy demand for Waddan city a community in southern Libya which has a demand for combined cooling/electricity only or cooling/electricity with district hot water supply. The results revealed that all of the proposed simulated stand-alone models, except the water-cooled half effect chiller, are not economically viable unless they are heavily subsidized or combined with the district hot water supply at least in the winter season. 展开更多
关键词 Libya low-temperature geothermal resources economical analysis IPSEpro organic Rankine cycle absorption chillers.
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Energetic and Exergetic Analysis of Organic Rankine Cycle Powered by Hot Geothermal Water
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作者 Fathi Latrash Mohammed A. Al-Weshahi +1 位作者 Basim M.A Makhdoum brian agnew 《Journal of Energy and Power Engineering》 2014年第7期1217-1231,共15页
The paper presents an investigation of energy and exergy analysis of an existing ORC (organic rankine cycle) unit powered by hot geothermal water. The validated model of this unit was used to examine 25 refrigerants... The paper presents an investigation of energy and exergy analysis of an existing ORC (organic rankine cycle) unit powered by hot geothermal water. The validated model of this unit was used to examine 25 refrigerants belonging to different chemical compositions. The study revealed that R141b and R123 produced the best net power, energy efficiency, and exergy efficiency, whereas R125 was the lowest. Hydrofluorocarbons (except R143a), hydrocarbons, and inorganic reflected attractive energy and exergy efficiencies. All investigated mixtures gained low performance compared with other studied candidates. The R245ca was the best among the hydrofluorocarbons studied refrigerants, and R501 was the best among the mixture refrigerants. Furthermore, within the ORC system, the evaporator was found to have the highest exergy destruction and the refrigerant pump was the lowest. 展开更多
关键词 Organic Rankine cycle EXERGY ENERGY refrigerants.
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