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Efficiencies of most conventional power generation systems (turbine based, gasifier based etc.) are in the range 30-40%. If the heat wasted during power generation is converted to useful heat, the efficiency of the total system can go up to 80%
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The amount of recoverable and economically feasible power generation from waste heat has been limited primarily to medium- to high-temperature waste heat sources (greater than 500 °F).
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https://www.epa.gov/sites/default/files/2015-07/documents/waste_heat_to_power_systems.pdf
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Organic Rankine Cycle (ORC) and water-based cycles are compared in terms of increased efficiency of systems from Waste Heat Recovery processes (WHR) and other advantages and their sensitivity to variable parameters.
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https://kth.diva-portal.org/smash/get/diva2:1150541/FULLTEXT01.pdf
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According to the Ministry of New and Renewable Energy (MNRE), the Indian Cement Industry has the highest potential (amongst identified sectors) to generate 1100 MW of clean energy through the installation of WHRS.
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https://www.cmaindia.org/enhancing-energy-efficiency-through-waste-heat-recovery-system