Shift-characteristics and bounds of thermal performance of organic Rankine cycle based on trapezoidal model

Li, Xinguo; Wang, Jingyi; Wu, Xiuli

doi:10.1007/s11431-018-9331-9

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…The thermal performance of the ORC exists a monotonic increase or a maximum value with an optimum point because of the relationship between the heat source temperature and the critical temperature of working fluid. 22 Correspondingly, there is a shift of the performance from the optimum condition to the monotonic increase and a corresponding shift temperature of heat source.…”

Section: The Origin Of Adjusting the Pphtmentioning

confidence: 99%

“…Li et al 21 proposed the ORC with an ejector to increase the net power output of the ORC. Previous studies 22 showed that the performance of the BORC has two kinds of variations with the evaporation temperature: the optimum condition with the maximum or monotonic increase that according to the relationship between the critical temperature of the working fluids and the temperature of the LGHS. The performance with a monotonic increase is better than that with an optimum condition.…”

Section: Introductionmentioning

confidence: 99%

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Adjusting the pinch point of heat transfer to improve the thermal performance of the organic Rankine cycle

2021

Intl J of Energy Research

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For the thermal performance of the organic Rankine cycle (ORC), there exists a monotonic increase or a maximum value with an optimum point because of the relationship between the heat source temperature and the critical temperature of working fluid. The performance with a monotonic increase is better than that with an optimum value. However, the ORC with a low-grade heat source generally falls into the condition with an optimum value when working fluids have a high critical temperature, for example, R245fa. Early research revealed that this phenomenon is affected by the location of the pinch point of the heat transfer (PPHT) in the heat addition process. Based on this consideration, an approach of adjusting the PPHT and a theoretical cycle: the ORC with adjustable pinch point of heat transfer (APPORC) are proposed, and two new configurations of the ORC with the adjustment of the PPHT are proposed: the organic Rankine cycle with an ejector (EORC) and organic Rankine cycle with a flasher (FORC). The theoretical performance of the APPORC is deduced, and its two innovative reconfiguration cycles are simulated and compared to the basic ORC (BORC). From the theoretical derivation as well as simulation results, the APPORC and its innovative cycles:The EORC and FORC can achieve higher net power output and lower thermal efficiency. The results also show that when the heat source temperature is in a range of 100 C to 160 C, the maximum net power outputs of the EORC and FORC with R245fa as working fluid increase 34.99%-22.57% and 16.96%-11.08%, respectively, compared to the BORC. The exergy destructions of the heat addition process of the EORC and FORC are lower compared to the BORC due to the better temperature matching. For the EORC with zeotropic mixtures R134a/R245fa (0.7/0.3) as working fluid, the increases in maximum net power output of 7.12% and 9.45% are obtained compared to pure fluids R245fa and R134a at a heat source temperature of 120 C. Furthermore, an additional benefit for the EORC with zeotropic mixtures was obtained: The condensation temperature glide can be adjusted to approach the temperature rise of the cooling water.ejector, flasher, optimization, organic Rankine cycle, pinch point of heat transfer (PPHT), temperature matching Abbreviations: APPORC, Organic Rankine cycle with adjustable pinch point; EORC, Organic Rankine cycle with an ejector; FORC, Organic Rankine cycle with a flasher; LGHS, Low-grade heat source; OFC, Organic flash cycle; ORC(BORC), Basic organic Rankine cycle; PPHT, Pinch point of heat transfer.

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Section: The Origin Of Adjusting the Pphtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adjusting the pinch point of heat transfer to improve the thermal performance of the organic Rankine cycle

2021

Intl J of Energy Research

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“…[9~11] 、复杂热经济系统 [12] 、传热 [13,14] 和传质 [15] 过程、广义传递过程 [ 1 6 ] 、有限势库化学机 [ 1 7 , 1 8 ] 、有限势库广义机 [19] 、微型能量转换系统 [20~22] 、热电装置 [23~26] 、内燃机 [27~30] 、有机朗肯循环 [31] 、Kalina循环 [32] 、化学反应过程 [33~36] 、动态过程 [37] 和循环 [38,39] .…”

Section: 被应用到各类能量系统的性能优化中取得了重要研究进展研究对象包括斯特林循环unclassified

Optimal current paths for a class of generalized electrochemical reaction systems

2020

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Experimental study of a micro-scale solar organic Rankine cycle system based on compound cylindrical Fresnel lens solar concentrator

Meng

Song

Wei

et al. 2019

Sci. China Technol. Sci.

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Shift-characteristics and bounds of thermal performance of organic Rankine cycle based on trapezoidal model

Cited by 5 publications

References 28 publications

Adjusting the pinch point of heat transfer to improve the thermal performance of the organic Rankine cycle

Adjusting the pinch point of heat transfer to improve the thermal performance of the organic Rankine cycle

Optimal current paths for a class of generalized electrochemical reaction systems

Experimental study of a micro-scale solar organic Rankine cycle system based on compound cylindrical Fresnel lens solar concentrator

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