Selection of working fluids for a novel low-temperature geothermally-powered ORC based cogeneration system

Guo, Tong; Wang, H.X.; Zhang, S.J.

doi:10.1016/j.enconman.2010.12.038

Cited by 101 publications

(21 citation statements)

References 18 publications

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“…In this context, the Organic Rankine Cycle (ORC) is mainly applied as energy conversion system. Regarding the optimisation of the subcritical ORC, a selection of pure media as working fluids is performed by numerous authors in respect to the heat source characteristics [3][4][5][6][7][8]. A promising optimisation approach for ORC systems is the use of mixtures as working fluids.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures

Heberle

Brüggemann

2015

Energies

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Abstract:We present a thermo-economic evaluation of binary power plants based on the Organic Rankine Cycle (ORC) for geothermal power generation. The focus of this study is to analyse if an efficiency increase by using zeotropic mixtures as working fluid overcompensates additional requirements regarding the major power plant components. The optimization approach is compared to systems with pure media. Based on process simulations, heat exchange equipment is designed and cost estimations are performed. For heat source temperatures between 100 and 180 °C selected zeotropic mixtures lead to an increase in second law efficiency of up to 20.6% compared to pure fluids. Especially for temperatures about 160 °C, mixtures like propane/isobutane, isobutane/isopentane, or R227ea/R245fa show lower electricity generation costs compared to the most efficient pure fluid. In case of a geothermal fluid temperature of 120 °C, R227ea and propane/isobutane are cost-efficient working fluids. The uncertainties regarding fluid properties of zeotropic mixtures, mainly affect the heat exchange surface. However, the influence on the determined economic parameter is marginal. In general, zeotropic mixtures are a promising approach to improve the economics of geothermal ORC systems. Additionally, the use of mixtures increases the spectrum of potential working fluids, which is important in context of present and future legal requirements considering fluorinated refrigerants.

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Section: Introductionmentioning

confidence: 99%

Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures

Heberle

Brüggemann

2015

Energies

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“…Based on experimental investigations for a naturally aspirated gasoline engine, theoretically, the maximum overall fuel efficiency can come up to 60% through waste heat recovery (WHR) [1]. Thus, WHR is widely accepted as a promising field and numerous scholars show their interests towards it [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Parametric Optimization and Working Fluid Selection of Organic Rankine Cycle (ORC) for Engine Cooling Water Waste Heat Recovery

Chen¹,

Wang²,

Zhang³

2015

Proceedings of the 2015 International Conference on Industrial Technology and Management Science

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In this paper, aimed to utilize engine cooling waste heat completely, thus promoting engine fuel economy significantly, organic Rankine cycle (ORC) system is proposed and investigated in detail. Considering environmental impact, four promising hydrocarbons, namely butane, isobutane, pentane and isopentane are taken into consideration. The results indicate that butane distinguishes among other fluids for the highest value of output power, and its output power is as large as 6.33kW, besides that its volumetric flow rate is relatively low as well. Pentane and isopentane can acquire a maximum thermal efficiency of 9.5% or more for the whole operating parameters.

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“…It is a hopeful system for heat conversion to mechanical power at low temperature, adapted to solar applications. The particularity of the organic fluids is that they could be used at an evaporation temperature much lower than a conventional water turbine does, providing high efficiency [9][10][11]. Organic fluids used usually are: refrigerating fluid hydro-fluoro-carbon (HFC), ammonia, butane, l' iso-pentane, toluene, which have generally high molecular masses.…”

Section: Introductionmentioning

confidence: 99%

Exergy analysis of a solar combined cycle: organic Rankine cycle and absorption cooling system

Grosu

Marin

Dobrovicescu

et al. 2015

Int J Energy Environ Eng

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In this paper, exergy analysis is used to evaluate the performance of a combined cycle: organic Rankine cycle (ORC) and absorption cooling system (ACS) using LiBr-H 2 O, powered by a solar field with linear concentrators. The goal of this work is to design the cogeneration system able to supply electricity and ambient cooling of an academic building and to find solutions to improve the performance of the global system. Solar ACS is combined with the ORC system-its coefficient of performance depends on the inlet temperature of the generator which is imposed by the outlet of the ORC. Exergetic efficiency and exergy destruction ratio are calculated for the whole system according to the second law of thermodynamics. Exergy analysis of each sub-system leads to the choice of the optimum physical parameters for minimum local exergy destruction ratios. In this way, a different connection of the heat exchangers is proposed in order to assure a maximum heat recovery.

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Selection of working fluids for a novel low-temperature geothermally-powered ORC based cogeneration system

Cited by 101 publications

References 18 publications

Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures

Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures

Parametric Optimization and Working Fluid Selection of Organic Rankine Cycle (ORC) for Engine Cooling Water Waste Heat Recovery

Exergy analysis of a solar combined cycle: organic Rankine cycle and absorption cooling system

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