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Novel Supercritical CO2 Power Cycles for Waste Heat Recovery

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Novel Supercritical CO2 Power Cycles for Waste Heat Recovery ( novel-supercritical-co2-power-cycles-waste-heat-recovery )

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Energies 2020, 13, 370 28 of 31 Funding: This research was partially supported by the Fundação para a Ciência e a Tecnologia (FCT) through IDMEC, under LAETA, project UID/EMS/50022/2013. Conflicts of Interest: The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results. Nomenclature Acronyms C Compressor CL Cooler LT Low temperature LTR Low temperature recuperator LTT Low temperature turbine HT Heater or high temperature HTR High temperature recuperator HTT High temperature turbine REC Recuperator sCO2 Supercritical CO2 s-CO2 Supercritical CO2 T Turbine TIT Turbine inlet temperature WHR Waste heat recovery Parameters/Variables cp specific heat, kJ/kg-K m mass flow rate, kg/s m. mass flow rate, kg/s p pressure, MPa . Q heat transfer rate, kW s specific entropy, kJ/kg-K x mass fraction T temperature, ◦ C W power, kW . W power, kW ∆ difference ε recuperator effectiveness η efficiency, % φ heat recovery effectiveness Subscripts amb ambient av available C compressor hs heat source in inlet inter intermediate is isentropic m mechanical mg mechanical/generator min minimum net net opt optimum out outlet rec recovered

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