Thermodynamic analysis of a simple Organic Rankine Cycle

Javanshir, Alireza; Sarunac, Nenad

doi:10.1016/j.energy.2016.12.019

Cited by 67 publications

(14 citation statements)

References 29 publications

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“…Based on the previous studies performed by the authors [31,32], thermal efficiency of a subcritical ORC without a superheat can be calculated as:…”

Section: Thermal Efficiency Of a Simple Orcmentioning

confidence: 99%

“…According to Equations (1) and (4), η th decreases as the Jacob number increases. Details are provided in [31,32]. Based on the results, the following expression for the specific heat input for a subcritical ORC without a superheat was developed:…”

Section: Thermal Efficiency Of a Simple Orcmentioning

confidence: 99%

“…Twelve working fluids were analyzed in this study. Based on previous studies, the workings fluids selected for the analysis have the potential to give a good ORC performance [31][32][33]. Based on the slope of the saturated vapor curve in the T-s diagram (Figure 4), working fluids are divided into three main groups: dry, wet, and isentropic.…”

Section: Thermodynamic and Environmental Properties Of The Working Flmentioning

confidence: 99%

“…Compared to a subcritical cycle without a superheat, thermal efficiency of a superheated subcritical cycle is affected by an additional variable; the superheat temperature. The following expression for thermal efficiency of a superheated ORC was proposed by the authors [31,32] η th = η t (c 1 Ja t + c 2 )…”

Section: Thermal Efficiency Of a Simple Orcmentioning

confidence: 99%

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Thermodynamic Analysis of ORC and Its Application for Waste Heat Recovery

2017

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Abstract:The analysis and optimization of an organic Rankine cycle (ORC) used as a bottoming cycle in the Brayton/ORC and steam Rankine/ORC combined cycle configurations is the main focus of this study. The results show that CO 2 and air are the best working fluids for the topping (Brayton) cycle. Depending on the exhaust temperature of the topping cycle, Iso-butane, R11 and ethanol are the preferred working fluids for the bottoming (ORC) cycle, resulting in the highest efficiency of the combined cycle. Results of the techno-economic study show that combined Brayton/ORC cycle has significantly lower total capital investment and levelized cost of electricity (LCOE) compared to the regenerative Brayton cycle. An analysis of a combined steam Rankine/ORC cycle was performed to determine the increase in power output that would be achieved by adding a bottoming ORC to the utility-scale steam Rankine cycle, and determine the effect of ambient conditions (heat sink temperature) on power increase. For the selected power plant location, the large difference between the winter and summer temperatures has a considerable effect on the ORC power output, which varies by more than 60% from winter to summer.

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“…Based on the previous studies performed by the authors [31,32], thermal efficiency of a subcritical ORC without a superheat can be calculated as:…”

Section: Thermal Efficiency Of a Simple Orcmentioning

confidence: 99%

Section: Thermal Efficiency Of a Simple Orcmentioning

confidence: 99%

Section: Thermodynamic and Environmental Properties Of The Working Flmentioning

confidence: 99%

Section: Thermal Efficiency Of a Simple Orcmentioning

confidence: 99%

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Thermodynamic Analysis of ORC and Its Application for Waste Heat Recovery

2017

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“…Zhang et al [14] carried out performance evaluation of organic Rankine cycle systems utilizing low grade energy at different temperature. Javanshir and Sarunac [15] analyzed thermal efficiency and net power output of a simple subcritical and super critical Organic Rankine Cycle. Efficiency of an ORC operating with isentropic working fluids is higher compared to the dry and wet fluids, and working fluids with higher specific heat capacity provide higher cycle net power output.…”

Section: Fig 1 Simple Organic Rankine Cycle (Orc)mentioning

confidence: 99%

Performance Estimation of Organic Rankine Cycle by Using Soft Computing Technics

Kovacı¹,

Şahin²,

Dikmen³

et al. 2017

International Journal of Engineering &Amp; Applied Sciences

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Optimization of binary zeotropic mixture working fluids for an organic Rankine cycle for waste heat recovery between centrifugal compressor stages

Lin

Qin

Han

2020

Energy Science & Engineering

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The organic Rankine cycle is an effective way to recover low‐temperature waste heat, and a mixture working fluid can effectively improve the performance of the organic Rankine cycle. In order to find the best pure and mixture working fluid quickly and accurately, thirteen pure working fluids and zeotropic mixtures of two of those fluids are selected to study the performance of the organic Rankine cycle, and the net power output is selected as the objective function. Through calculation and analysis, the best pinch temperature difference and evaporation temperature are determined. By calculating the approximate net power output, we find that the parameter (k·Δs5‐1)−1, which is determined by the physical properties of a working fluid, plays an important role in the pure working fluid optimization. In addition, the condensation temperature glide and (k·Δs5‐1)−1 together determine the optimized binary zeotropic mixture. As a result, R227ea and R227ea/hexane (0.98/0.02) are shown to be the optimal pure working fluid and binary zeotropic mixture. Using this mixture resulted in a net power output of 424.63 kW, which is 29.3% higher than that of the pure working fluid R227ea.

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Thermodynamic analysis of a simple Organic Rankine Cycle

Cited by 67 publications

References 29 publications

Thermodynamic Analysis of ORC and Its Application for Waste Heat Recovery

Thermodynamic Analysis of ORC and Its Application for Waste Heat Recovery

Performance Estimation of Organic Rankine Cycle by Using Soft Computing Technics

Optimization of binary zeotropic mixture working fluids for an organic Rankine cycle for waste heat recovery between centrifugal compressor stages

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