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Exergy

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Exergy ( exergy )

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A computer model for thermal and exergy efficiencies, heat transfer factor and turbine size is built. The outputs give information on cycle performance and cost as mostly some non dimensional numbers. Then, effect of selecting components with different characteristics and ORC features has been studied on them. 1­3 Background It is believed that idea of ORC as power generation system from low heat sources was first presented in 1961 by Israeli solar engineers Harry Zvi Tabor and Lucien Bronicki. 6 In Figure 3 it is shown that current market share of Biomass ORC is a dominant share and Geothermal which used to be the most significant part is in second position currently. Waste heat recovery in different industries which is in third place can be applied to numerous industries and solar ORC still have a huge potential to be flourished. This technology, due to lack of awareness, currently is only 1% of ORC market. Biomass based application is so developed since it is the only proven technology for decentralized applications to gain powers up to 1MWel from solid fuels like biomass.10 From 1980s which ORC has been available in the market, more than 200 projects with total power of about 2000 megawatts of electricity have been installed. This is while that rate of ORC usage has been unprecedentedly soared in recent years. This shows a promising future for ORC market in near future. Biomass ORC 48% Geothermal ORC 31% Waste heat recovery 20% Solar applications 1% Figure 3: ORC market share for different heat sources Source: Fifth European conference, Economics and management of energy in industries.7 6 Wikipedia, the free encyclopedia; available at: http://en.wikipedia.org/wiki/Organic_Rankine_Cycle#References; as accessed: 19.06.2010. 7 Sylvain Quoilin and Vincent Lemort; available at: http://www.labothap.ulg.ac.be/cmsms/uploads/File/ECEMEI_PaperULg_SQVL090407.pdf; as accessed: 01.05.2010 8

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