Working fluid selection of Organic Rankine Cycles

Herath, H.M.D.P.; Wijewardane, M.A.; Ranasinghe, Chathura; Jayasekera, J.G.A.S.

doi:10.1016/j.egyr.2020.11.150

Cited by 66 publications

(21 citation statements)

References 12 publications

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“…A lot of studies have been performed for working fluid selection [6,7]. The performance of several organic working fluids was investigated by Herath et al [8] and they concluded that Benzene gives significantly higher efficiencies than the others at the evaporator temperatures of 100 °C to 200 °C. The performance of various organic fluids in an ORC system was investigated in another study [9] and toluene showed the best performance with 31.5% system efficiency.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Solar Organic Rankine Cycle Using Evacuated Tubular Collector

Çağlar

BAHADIR

2023

Politeknik Dergisi

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This study investigates the affecting parameters for the thermal performance of a Solar Organic Rankine Cycle. The thermodynamic analysis covers the research on the effects of the following parameters: the pressure and temperature of the working fluid at the turbine entrance, and the turbine and pump isentropic efficiencies. The solar organic Rankine cycle is analyzed for an evacuated tubular solar collector. The required collector area for both a fixed value (0.8) of solar fraction and several source (solar collector output) temperatures is also determined for different months of the year in the study. The computer software of Engineering Equation Solver (EES) is used to construct the mathematical model of the cycle and to perform the thermodynamic analysis of the system. In the analysis, R123 and R600 organic fluids are used, and a comparison is made between the two fluids in terms of their effects on the system performance. The results show that R600 has better performance characteristics than R123. The results also show that the system efficiency decreases with increasing temperature at turbine entrance, but with decreasing pressure at turbine entrance. The turbine efficiency influences the system thermal efficiency significantly while the pump efficiency does not have a significant effect on the system thermal efficiency.

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Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Solar Organic Rankine Cycle Using Evacuated Tubular Collector

Çağlar

BAHADIR

2023

Politeknik Dergisi

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“…The choice of working fluids has a crucial role in designing the organic cycle and significantly impacts the cycle performance. 15,16 One of the crucial parameters for working fluids is their critical temperature, 17,18 giving the absolute upper-temperature limit for subcritical cycles. The thermo-economic and thermodynamics performance of working fluids with high critical temperatures is usually better than those with low critical temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…There are hundreds of organic fluids that can be used in ORC. The choice of working fluids has a crucial role in designing the organic cycle and significantly impacts the cycle performance 15,16 . One of the crucial parameters for working fluids is their critical temperature, 17,18 giving the absolute upper‐temperature limit for subcritical cycles.…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermal efficiency for subcritical ORC and TFC using super dry working fluids

Ahmed

Imre

2022

Energy Science & Engineering

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Efficiency is a crucial factor for power cycles. Generally, in the same temperature range, the cycle efficiency for a basic organic Rankine cycle (ORC) is higher than a similar trilateral flash cycle (TFC) for almost all working fluids and heat source/heat sink temperature pairs. According to some recent results, by using super dry working fluids, the thermal efficiency of TFC can outperform its ORC counterpart at high temperatures. This study performed the thermodynamics analysis using three dry working fluids with subcritical basic ORC and TFC with zero to partial recuperated heat ratio. The results showed that using recuperative heat exchange effectively contributes to increasing the efficiency of ORC and TFC. However, the rate of efficiency increase in ORC is higher than the TFC, which can be clearly seen, especially at high maximal cycle temperatures. Using super dry working fluids, the recuperator‐free TFC has favorable cycle efficiency at high heat source temperatures. In contrast, by adding heat recovery for both systems, the ORC can outperform the TFC at 0.4, 0.2, and 0.1 recuperated heat effectiveness for Dodecane, Decane, and Nonane, respectively.

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“…To generate electricity from low-temperature energy sources available at temperatures of (80-150)°C, the ORC systems are recommended [14]. Although ORC systems are a mature technology, their use is limited, mainly due to the fact that potential investors and users do not recognise the ability of these systems to conserve energy [15].…”

Section: Introductionmentioning

confidence: 99%

“…The efficiency, size and cost of an ORC system depend primarily on the working fluid, which is chosen according to the temperature of the heat source, and then on the evaporation temperature, condensation temperature and system configuration. There are many studies on working fluid selection for a particular application [14,[16][17][18]. In addition to the type of application and the temperature of the heat source, the selection of working fluid also takes into account the following: the auto-ignition temperature, which must be much higher than the maximum working temperature of the fluid; the enthalpy drop in the expander must be as large as possible to minimize fluid flow to the pump; in the T-s diagram, the inclination of the saturation curve must be as close as possible to the isentropic curves in order to avoid overheating; ODP and GWP to be minimal; fluid cost to be reduced; the critical temperature should be reduced because the vapour density is higher at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

Energy and economic analysis of an ORC combined to steam boiler

2021

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Energy and economic performance of an organic Rankine cycle (ORC) system designed to recycle waste heat of a steam boiler was analysed. Optimisation of ORC system was performed by using the Cycle-Tempo software and the REFPROP program. The selected working fluid was R245fa. For the exhaust gases temperature of 163°C and mass flow rate of 11.83 kg/s, cooling water temperature of 20°C resulted a gross efficiency of 21.02% and a cost of 2987 €/kW, an electricity levelised cost of 102 €/kWh and a payback period of 5.5 years.

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Working fluid selection of Organic Rankine Cycles

Cited by 66 publications

References 12 publications

Thermodynamic Analysis of Solar Organic Rankine Cycle Using Evacuated Tubular Collector

Thermodynamic Analysis of Solar Organic Rankine Cycle Using Evacuated Tubular Collector

Investigation of thermal efficiency for subcritical ORC and TFC using super dry working fluids

Energy and economic analysis of an ORC combined to steam boiler

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