Analysis of ORC (Organic Rankine Cycle) systems with pure hydrocarbons and mixtures of hydrocarbon and retardant for engine waste heat recovery

Song, Jian; Gu, Chen

doi:10.1016/j.applthermaleng.2015.06.055

Cited by 94 publications

(15 citation statements)

References 26 publications

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“…The exhaust gas mass flow rate is 7139 kg/h; the jacket cooling water mass flow rate and temperature are 6876 kg/h and 363.15 K, correspondingly [18]. The PPTD of the HTL evaporator is the largest [5,19] because the heat transfer performance of engine exhaust gas is low; the PPTD of the HTL evaporator is set to 20 K on the basis of Literature [18,43]; the PPTDs of the LTL preheater and condenser/evaporator are set to 10 K on the basis of Literature [40,43]; and PPTD of 5 K is common for an LTL condenser [5,19,40,43]. The DORC parameters are listed in Table 6 [43].…”

Section: Optimization Methodsmentioning

confidence: 99%

“…The engine exhaust gas temperatures of 523.15-623.15 K are considered in the present work because these temperatures are common and suitable for ORC application [6,29,30]. Cyclopentane, cyclohexane, benzene, and toluene [12,18,29,[32][33][34][35][36] are selected as the HTL working fluids because they possess efficient thermal performance with high temperature and favorable environmental and high decomposition temperature. Furthermore, R1234ze(E), R600a, R245fa, and R601a are selected as working fluids for LTLs [8,[37][38][39][40][41] given the efficient environmental and thermal performances with low temperature.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Performance Analyses and Optimization of Dual-Loop Organic Rankine Cycles for Internal Combustion Engine Waste Heat Recovery

Duan

et al. 2019

Applied Sciences

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Waste heats of an internal combustion engine (ICE) are recovered by a dual-loop organic Rankine cycle (DORC). Thermodynamic performance analyses and optimizations are conducted with 523.15–623.15 K exhaust gas temperature (Tg1). Cyclopentane, cyclohexane, benzene, and toluene are selected as working fluids for high-temperature loop (HTL), whereas R1234ze(E), R600a, R245fa, and R601a are selected as working fluids for low-temperature loop (LTL). The HTL evaporation temperature, condensation temperature, and superheat degree are optimized through a genetic algorithm, and net power output is selected as the objective function. Influences of Tg1 on system net power output, thermal efficiency, exergy efficiency, HTL evaporation temperature, HTL condensation temperature, HTL superheat degree, exhaust gas temperature at the exit of the HTL evaporator, heat utilization ratio, and exergy destruction rate of the components are analyzed. Results are presented as follows: the net power output is mainly influenced by HTL working fluid. The optimal LTL working fluid is R1234ze(E). The optimal HTL evaporator temperature increases with Tg1 until it reaches the upper limit. The optimal HTL condensation temperature increases initially and later remains unchanged for a cyclopentane system, thus keeping constant for other systems. Saturated cycle is suitable for cyclohexane, benzene, and toluene systems. Superheat cycle improves the net power output for a cyclopentane system when Tg1 is 568.15–623.15 K.

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Section: Optimization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic Performance Analyses and Optimization of Dual-Loop Organic Rankine Cycles for Internal Combustion Engine Waste Heat Recovery

Duan

et al. 2019

Applied Sciences

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“…However, the limitation of practical application for the alkanes is flammable, which is difficult to meet the security requirements. By adding a certain amount of flame retardants, this issue can be partly solved while achieving good system performance . In this paper, n‐hexane, n‐heptane and, cyclohexane are selected as the component of mixture because their chemical stability, thermal properties, and critical temperature are suitable for ORC systems used in harvesting engine waste heat.…”

Section: System Descriptionmentioning

confidence: 99%

Composition shift in zeotropic mixture-based organic Rankine cycle system for harvesting engine waste heat

Tian

Shu

et al. 2018

Int J Energy Res

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Summary Zeotropic mixture–based organic Rankine cycle (ORC) is a promising technology for harvesting engine waste heat as the property called temperature glide can efficiently improve the temperature mismatch between working fluid and varying temperature heat source. However, a phenomenon called composition shift appearing as different fractions between circulating composition and charge composition accompanies in zeotropic mixtures–based ORC system, which affects system performance directly. To investigate the influence of composition shift on system performance, this paper establishes the thermodynamic model and composition shift model of ORC system. On the basis of simulation results for selected alkanes/R123 zeotropic mixture, the circulating fraction of R123 is higher than its charge fraction, which results in a lower performance of ORC system. For cyclohexane/R123 mixture, the actual mass fraction of R123 increases from 0.5 to 0.52, leading to a maximum decrease of net power by 3%. The factors affecting composition shift such as charge fraction, evaporation pressure, and charge quality are discussed. By increasing the charge fraction of R123, the composition shift can be alleviated within the limitation of safety boundary in this paper. Higher evaporation pressure and larger charge quality can also mitigate the composition shift. Besides, the results indicate that composition shift and temperature glide have similar changing trends, thus temperature glide could be used as predicting the degree of composition shift.

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“…Garg et al [40] have used this philosophy and evaluated some of the possible mixtures with saturated hydrocarbons such as propane, butane, pentane etc. A similar approach of blending hydrocarbons with some halocarbon refrigerants has also been proposed in the past [41][42][43]. It is important that all components of the mixture be environmentally friendly.…”

Section: Co 2 As a Blend With Other Working Fluidsmentioning

confidence: 99%

Carbon dioxide based power generation in renewable energy systems

Kumar

Srinivasan

2016

Applied Thermal Engineering

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After a substantial impact on refrigeration, carbon dioxide (CO 2 ) is gaining considerable attention as a working fluid for thermal power generation. This can be attributed mainly to its excellent heat transfer properties and compactness of components arising from its high density. It has the merit of being amenable to operation in sub-, trans-or super-critical Brayton cycle modes. However, inhibiting factors are high pressures needed when operated in trans-or supercritical cycles and the work of compression eroding most of the work of expansion in subcritical cycle operation. Some of the lacunae of CO 2 such as high work of compression can be alleviated by using non-mechanical means such as thermal compression using the adsorption technique either for partial compression in high pressure Brayton cycles or for total compression in low pressure cycles. CO 2 has also been proposed as an additive to flammable hydrocarbons such that their flammability can be suppressed and yet retaining their other desirable thermodynamic qualities. This review explores the potential and limitations of thermodynamic © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ cycles where either CO 2 is used alone or as a component in mixture of working fluids. Inter alia,it also highlights the issues of regulation of load management using the efficiency-specific power output plane. When used as a blending component, pinch point in the regenerators affects the cycle performance. The objective is to identify research and developmental challenges involving CO 2 as a working fluid specifically for solar power generation.

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Analysis of ORC (Organic Rankine Cycle) systems with pure hydrocarbons and mixtures of hydrocarbon and retardant for engine waste heat recovery

Cited by 94 publications

References 26 publications

Thermodynamic Performance Analyses and Optimization of Dual-Loop Organic Rankine Cycles for Internal Combustion Engine Waste Heat Recovery

Thermodynamic Performance Analyses and Optimization of Dual-Loop Organic Rankine Cycles for Internal Combustion Engine Waste Heat Recovery

Composition shift in zeotropic mixture-based organic Rankine cycle system for harvesting engine waste heat

Carbon dioxide based power generation in renewable energy systems

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