Water Mixtures as Working Fluids in Organic Rankine Cycles

Invernizzi, Costante Mario; Binotti, Marco; Bombarda, P.; Marcoberardino, Gioele Di; Iora, Paolo; Manzolini, Giampaolo

doi:10.3390/en12132629

Cited by 12 publications

(7 citation statements)

References 48 publications

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“…Yamankaradeniz et al [32] analyzed the variation in the evaporator effectiveness in a G-ORC, and found that the energy and exergy efficiencies increased up to 6.87% and 6.21%, with the increment of the effectiveness. Invernizzi et al [33] studied a modified ORC including a flashing tank and a mixing chamber, as shown in Figure 7. It was found that the use of water/organic fluid mixtures was convenient in terms of system performance and turbine design.…”

Section: Single-stage Orcmentioning

confidence: 99%

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A Comprehensive Review of Organic Rankine Cycles

et al. 2023

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It has been demonstrated that energy systems driven by conventional energy sources like fossil fuels are one of the main causes of climate change. Organic Rankine cycles can help to reduce that impact, as they can be operated by using the industrial waste heat of renewable energies. The present study presents a comprehensive bibliographic review of organic Rankine cycles. The study not only actualizes previous reviews that mainly focused on basic cycles operating on subcritical or supercritical conditions, but also includes the analysis of novel cycles such as two-stage and hybrid cycles and the used fluids. Recuperative and regenerative cycles are more efficient than reheated and basic single-stage cycles. The use of two-stage cycles makes it possible to achieve higher thermal efficiencies and net power outputs of up to 20% and 44%, respectively, compared with those obtained with single-stage cycles. Theoretical studies show that hybrid systems, including Brayton and organic Rankine cycles, are the most efficient; however, they require very high temperatures to operate. Most organic Rankine cycle plants produce net power outputs from 1 kW up to several tens of kW, mainly using microturbines and plate heat exchangers.

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Section: Single-stage Orcmentioning

confidence: 99%

“…Invernizzi et al [33] studied a modified ORC including a flashing tank and a mixing chamber, as shown in Figure 7. It was found that the use of water/organic fluid mixtures was convenient in terms of system performance and turbine design.…”

Section: Single-stage Orcmentioning

confidence: 99%

A Comprehensive Review of Organic Rankine Cycles

et al. 2023

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“…Therefore, it is possible-at least in principle-to find the correct working fluid for any application [25]. For example, it is possible to produce condensation in hot environments or to control the pressure expansion ratio or the minimum and maximum pressures [38][39][40][41]. In particular, mixtures of carbon dioxide as working fluids in closed power cycles have already been considered by some authors in the past [42][43][44][45].…”

Section: Transcritical Cycles With Mixtures Of Carbon Dioxidementioning

confidence: 99%

Carbon Dioxide Mixtures as Working Fluid for High-Temperature Heat Recovery: A Thermodynamic Comparison with Transcritical Organic Rankine Cycles

et al. 2020

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This study aims to provide a thermodynamic comparison between supercritical CO2 cycles and ORC cycles utilizing flue gases as waste heat source. Moreover, the possibility of using CO2 mixtures as working fluids in transcritical cycles to enhance the performance of the thermodynamic cycle is explored. ORCs operating with pure working fluids show higher cyclic thermal and total efficiencies compared to supercritical CO2 cycles; thus, they represent a better option for high-temperature waste heat recovery provided that the thermal stability at a higher temperature has been assessed. Based on the improved global thermodynamic performance and good thermal stability of R134a, CO2-R134a is investigated as an illustrative, promising working fluid mixture for transcritical power cycles. The results show that a total efficiency of 0.1476 is obtained for the CO2-R134a mixture (0.3 mole fraction of R134a) at a maximum cycle pressure of 200 bars, which is 15.86% higher than the supercritical carbon dioxide cycle efficiency of 0.1274, obtained at the comparatively high maximum pressure of 300 bars. Steam cycles, owing to their larger number of required turbine stages and lower power output, did not prove to be a suitable option in this application.

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“…However, in order to evaluate the best performing ORC, the selection of working fluids is essential [43,44]. There are many fluid selection criteria, such as thermodynamic properties, environmental effect and price [45,46]. There are two parameters to decide the effect of working fluids on the environment, which are Ozone Depletion Potential (ODP) and Global Warming Potential (GWP) [47,48].…”

Section: Working Fluids Of the Orcmentioning

confidence: 99%

Parametric Optimisation of an ORC in a Wood Chipboard Production Facility to Recover Waste Heat Produced from the Drying and Steam Production Process

Koç

2019

Energies

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The wastes in wood industries (waste chips) are commonly used as fuel for burners to produce steam and to use the remaining heat in the drying process. However, in spite of that, there is a considerable amount of heat evaluated from the burn of waste chips still released to the atmosphere without use. Therefore, in the present study, a cogeneration cycle design by used of ORC was designed and parametrically optimised for six organic working fluids (acetone, ethanol, R11, RE245fa2, R365mfc and R601a). During the ORC optimisation, the ORC turbine inlet temperature was changed from the saturated steam temperature of the fluid to the maximum temperature of the fluid. The ORC turbine inlet pressure was increased from 7.5 bar to the critical pressure of the fluid. As a result of the study, the maximum net power, net thermal efficiency and exergy efficiency of the ORC were found as 453.91 kW, 30.01% and 67.56% at 340 °C and 62.5 bar from the ORC with ethanol. This means that almost 30% of the waste heat could be recovered by use of the ORC with ethanol. By using the designed cogeneration system, it was calculated that the thermal efficiency of the system can be increased up to 74.01%.

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Water Mixtures as Working Fluids in Organic Rankine Cycles

Cited by 12 publications

References 48 publications

A Comprehensive Review of Organic Rankine Cycles

A Comprehensive Review of Organic Rankine Cycles

Carbon Dioxide Mixtures as Working Fluid for High-Temperature Heat Recovery: A Thermodynamic Comparison with Transcritical Organic Rankine Cycles

Parametric Optimisation of an ORC in a Wood Chipboard Production Facility to Recover Waste Heat Produced from the Drying and Steam Production Process

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