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Performance optimization of low-temperature power generation by supercritical \ORCs\ (organic Rankine cycles) using low \GWP\ (global warming potential) working fluids

Abstract : This paper presents the system efficiency optimization scenarios of basic and regenerative supercritical \ORCs\ (organic Rankine cycles) using low-GWP (global warming potential) organic compounds as working fluid. A more common refrigerant, i.e. R134a, was also employed to make the comparison. A 150-°C, 5-bar-pressurized hot water is used to simulate the heat source medium. Power optimization was equally performed for the basic configuration of supercritical ORC. Thermodynamic performance comparison of supercritical \ORCs\ using different working fluids was achieved by ranking method and exergy analysis method. The highest optimal efficiency of the system (ηsys) is always obtained with \R152a\ in both basic (11.6%) and regenerative (13.1%) configurations. The highest value of optimum electrical power output (4.1 kW) is found with R1234ze. By using ranking method and considering low-GWP criterion, the best working fluids for system efficiency optimization of basic and regenerative cycles are \R32\ and R152a, respectively. The best working fluid for net electrical power optimization of basic cycle is R1234ze. Although \CO2\ has many desirable environmental and safety properties (e.g. zero \ODP\ (Ozone Depletion Potential), ultra low-GWP, non toxicity, non flammability, etc.), the worst thermodynamic performance is always found with the cycle using this compound as working fluid.
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https://hal.univ-lorraine.fr/hal-01418376
Contributor : Lemta Ul <>
Submitted on : Friday, December 16, 2016 - 4:27:02 PM
Last modification on : Monday, March 29, 2021 - 4:03:04 PM

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van Long Le, Michel Feidt, Abdelhamid Kheiri, Sandrine Pelloux-Prayer. Performance optimization of low-temperature power generation by supercritical \ORCs\ (organic Rankine cycles) using low \GWP\ (global warming potential) working fluids. Energy, Elsevier, 2014, 67, pp.513 - 526. ⟨10.1016/j.energy.2013.12.027⟩. ⟨hal-01418376⟩

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