 Working fluids for high-temperature organic Rankine cyclesNgoc Anh Lai, Martin Wendland and Johann Fischer Energy, 2011, vol. 36, issue 1, 199-211 Abstract: Alkanes, aromates and linear siloxanes are considered as working fluids for high-temperature organic Rankine cycles (ORCs). Case studies are performed using the molecular based equations of state BACKONE and PC-SAFT. First, “isolated” ORC processes with maximum temperatures of 250°C and 300°C are studied at sub- or supercritical maximum pressures. With internal heat recovery, the thermal efficiencies ηth averaged over all substances amount to about 70% of the Carnot efficiency and increase with the critical temperature. Second, we include a pinch analysis for the heat transfer from the heat carrier to the ORC working fluid by an external heat exchanger (EHE). The question is for the least heat capacity flow rates of the heat carrier required for 1MW net power output. For the heat carrier inlet temperatures of 280°C and 350°C are considered. Rankings based on the thermal efficiency of the ORC and on the heat capacity flow rates of the heat carrier as well as on the volume and the heat flow rates show cyclopentane to be the best working fluid for all cases studied. Keywords: Energy conversion; Organic Rankine cycles; Working fluids; Cyclopentane; Process optimization (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:36:y:2011:i:1:p:199-211 DOI: 10.1016/j.energy.2010.10.051 Access Statistics for this article Energy is currently edited by Henrik Lund and Mark J. Kaiser More articles in Energy from Elsevier |
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