Parametric optimization and performance analysis of ORC (organic Rankine cycle) for diesel engine waste heat recovery with a fin-and-tube evaporator

Yang, Fubin; Zhang, Hongguang; Chen, Bei; Song, Songsong; Wang, Enhua

doi:10.1016/j.energy.2015.08.034

Cited by 108 publications

(28 citation statements)

References 39 publications

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“…The high-pressure liquid absorbs heat from an engine exhaust gas in the HTL evaporator and is heated to a saturated or superheat vapor (2)(3)(4)(5). The saturated or superheated vapor from the HTL evaporator enters the HTL turbine and expands to perform work (5)(6). The exhaust vapor exits from the HTL turbine and then enters the condenser/evaporator to release heat to the LTL (6-1).…”

Section: System Modelmentioning

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.…”

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: System Modelmentioning

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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“…Considering the heat sources of exhaust gas, cylinder cooling water, and scavenge air cooling water, Yang 11 evaluated the optimum economic performance of a marine diesel engine. Employing genetic algorithm to retrieve exhaust waste heat from a diesel engine, Yang et al 14 presented the parametric optimization and performance analysis of an organic Rankine cycle. The thermo-economic optimization of an ORC system, which recovered waste heat from a marine diesel engine, was studied numerically by Yang and Yeh 13 .…”

Section: Introductionmentioning

confidence: 99%

“…The thermo-economic optimization of an ORC system, which recovered waste heat from a marine diesel engine, was studied numerically by Yang and Yeh 13 . Employing genetic algorithm to retrieve exhaust waste heat from a diesel engine, Yang et al 14 presented the parametric optimization and performance analysis of an organic Rankine cycle. At maximum rated power of engine, the ORC system achieved the maximum net power output per unit heat transfer area of 0.74 kW/m 2 , and the ratio of maximum effective heat transfer area to actual area of the evaporator was 69.19%.…”

Section: Introductionmentioning

confidence: 99%

Optimum composition ratios of multicomponent mixtures of organic Rankine cycle for engine waste heat recovery

Yang¹,

Yeh

2019

Int J Energy Res

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With the temperature glide in saturation states, the mixture working fluids have the advantages in thermal energy conversion. In this study, through the investigation in optimum mass fractions of multicomponent mixture working fluids, the economic performance enhancement of the organic Rankine cycle system is obtained for recovering waste heat from engine. The zero ozonedepletion-potential and dry working fluids of R236fa, R245fa, and R1336mzz (Z) are selected as the components of multicomponent mixtures in the system. The net power output, heat transfer calculation, and apparatus cost evaluation are employed to evaluate the power cost of the organic Rankine cycle system. Parameters of temperatures of waste heat sources and efficiencies of expanders are taken into account. The comparisons of economic performances for singlecomponent working fluid and multicomponent mixtures with optimum mass fractions are proposed. The results show that R245fa, having a levelized cost of energy, LCOE, of 8.75 × 10 −2 $/kW-h, performs the best for single-component working fluids, better than R236fa by 1.6% and R1336mzz(Z) by 8.3%. All the two-component mixtures are superior to their single-component working fluids in economic performance. Among the three two-component mixture working fluids, R1336mzz(Z)/R236fa has the lowest LCOE min , 8.57 × 10 −2$/kW-h, followed by R236fa/R245fa and R245fa/R1336mzz(Z). In addition, R236fa/R245fa/R1336mzz(Z) mixture, which has a LCOE min of 8.47 × 10 −2 $/kW-h, economically outperforms all other working fluids and has a lower LCOE min than R236fa/R245fa by 1.7% and R245fa/R1336mzz(Z) by 2%. K E Y W O R D Scomposition ratio, economic performance, multicomponent mixture, organic rankine cycle, working fluid

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“…Therefore, recovering exhaust energy is an effective means to save vehicle energy. In the case of waste heat recovery (WHR), the Organic Rankine Cycle (ORC) system is an effective technical solution and a promising means for industrialization of energy savings [5][6][7]. To date, research on ORC applications has mostly focused on large-scale heat sources, such as solar energy, geothermal energy, and industrial waste heat, etc.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Development of a Free Piston Expander–Linear Generator for Small-Scale Organic Rankine Cycle (ORC) Waste Heat Recovery System

Zhang

Yang

et al. 2016

Energies

Self Cite

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Abstract:A novel free piston expander-linear generator (FPE-LG) integrated unit was proposed to recover waste heat efficiently from vehicle engine. This integrated unit can be used in a small-scale Organic Rankine Cycle (ORC) system and can directly convert the thermodynamic energy of working fluid into electric energy. The conceptual design of the free piston expander (FPE) was introduced and discussed. A cam plate and the corresponding valve train were used to control the inlet and outlet valve timing of the FPE. The working principle of the FPE-LG was proven to be feasible using an air test rig. The indicated efficiency of the FPE was obtained from the p-V indicator diagram. The dynamic characteristics of the in-cylinder flow field during the intake and exhaust processes of the FPE were analyzed based on Fluent software and 3D numerical simulation models using a computation fluid dynamics method. Results show that the indicated efficiency of the FPE can reach 66.2% and the maximal electric power output of the FPE-LG can reach 22.7 W when the working frequency is 3 Hz and intake pressure is 0.2 MPa. Two large-scale vortices are formed during the intake process because of the non-uniform distribution of velocity and pressure. The vortex flow will convert pressure energy and kinetic energy into thermodynamic energy for the working fluid, which weakens the power capacity of the working fluid.

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Parametric optimization and performance analysis of ORC (organic Rankine cycle) for diesel engine waste heat recovery with a fin-and-tube evaporator

Cited by 108 publications

References 39 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

Optimum composition ratios of multicomponent mixtures of organic Rankine cycle for engine waste heat recovery

Preliminary Development of a Free Piston Expander–Linear Generator for Small-Scale Organic Rankine Cycle (ORC) Waste Heat Recovery System

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