Modeling and optimization of a shell and louvered fin mini-tubes heat exchanger in an ORC powered by an internal combustion engine

Mastrullo, R.; Mauro, A.W.; Revellin, Rémi; Viscito, Luca

doi:10.1016/j.enconman.2015.06.012

Cited by 53 publications

(16 citation statements)

References 42 publications

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“…In this case, considering the ORC system characteristics, a positive displacement expander has been selected. According to the literature, 0.70 was considered as the isentropic efficiency of the expander [22], while the pump efficiency was fixed equal to 0.65 [23,24].…”

Section: Modelling and Analysismentioning

confidence: 99%

An Organic Rankine Cycle Bottoming a Diesel Engine Powered Passenger Car

et al. 2020

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Organic Rankine Cycle (ORC) power plants are characterized by high efficiency and flexibility, as a result of a high degree of maturity. These systems are particularly suited for recovering energy from low temperature heat sources, such as exhaust heat from other plants. Despite ORCs having been assumed to be appropriate for stationary power plants, since their layout, size and weight constraints are less stringent, they represent a possible solution for improving the efficiency of propulsion systems for road transportation. The present paper investigates an ORC system recovering heat from the exhaust gases of an internal combustion engine. A passenger car with a Diesel engine was tested over a Real Driving Emission (RDE) cycle. During the test exhaust gas mass flow rate and temperature have been measured, thus calculating the enthalpy stream content available as heat addition to ORC plant in actual driving conditions. Engine operating conditions during the test were discretized with a 10-point grid in the engine torque–speed plane. The ten discretized conditions were employed to evaluate the ORC power and the consequent engine efficiency increase in real driving conditions for the actual Rankine cycle. N-pentane (R601) was identified as the working fluid for ORC and R134a was employed as reference fluid for comparison purposes. The achievable power from the ORC system was calculated to be between 0.2 and 1.3 kW, with 13% system efficiency. The engine efficiency increment ranged from 2.0% to 7.5%, with an average efficiency increment of 4.6% over the RDE test.

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Section: Modelling and Analysismentioning

confidence: 99%

An Organic Rankine Cycle Bottoming a Diesel Engine Powered Passenger Car

et al. 2020

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“…Hatami et al [37] presented a CFD modelling effort of an exhaust finned-tube heat exchanger for ICE-WHR, optimizing geometries to achieve maximum efficiency with a minimum pressure drop. Mastrullo et al [38] proposed new concepts for compact heat exchangers in ORC systems by adopting a shell and louvered fin mini-tubes structure and more than 5% relative pressure drop on the refrigerant side was observed for some specific geometries. Mokkapati and Lin [39] numerically studied corrugated-tube heat exchangers with twisted tapes for a heavy-duty diesel engine WHR system and results showed the heat transfer was enhanced by >230% compared to plain tube ones.…”

Section: Introductionmentioning

confidence: 99%

Organic Rankine cycle systems for engine waste-heat recovery: Heat exchanger design in space-constrained applications

Song

et al. 2019

Energy Conversion and Management

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Organic Rankine cycle (ORC) systems are a promising solution for improving internal combustion engine efficiencies, however, conflicts between the pressure drops in the heat exchangers, overall thermodynamic performance and economic viability are acute in this space-constrained application. This paper focuses on the interaction of the heat exchanger pressure drop (HEPD) and the thermo-economic performance of ORC systems in engine waste-heat recovery applications. An iterative procedure is included in the thermo-economic analysis of such systems that quantifies the HEPD in each case, and uses this information to revise the cycle and to resize the components until convergence. The newly proposed approach is compared with conventional methods in which the heat exchangers are sized after thermodynamic cycle modelling and the pressure drops through them are ignored, in order to understand and quantify the effects of the HEPD on ORC system design and working fluid selection. Results demonstrate that neglecting the HEPD leads to significant overestimations of both the thermodynamic and the economic performance of ORC systems, which for some indicators can be as high as >80% in some cases, and that this can be effectively avoided with the improved approach that accounts for the HEPD. In such space-limited applications, the heat exchangers can be designed with a smaller cross-section in order to achieve a better compromise between packaging volume, heat transfer and ORC net power output. Furthermore, we identify differences in working fluid selection that arise from the fact that different working fluids give rise to different levels of HEPD. The optimized thermo-economic approach proposed here improves the accuracy and reliability of conventional early-stage engineering design and assessments, which can be extended to other similar thermal systems (i.e., CO2 cycle, Brayton cycle, etc.) that involve heat exchangers integration in similar applications.

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“…Internal combustion engine is one of the main fossil energy consumers in modern society, but more than one third of the fuel energy carried by exhaust gas is dissipated in the form of waste heat . Converting this part of waste heat into useful power is significant for the improvement of engine efficiency and the reduction of emissions.…”

Section: Introductionmentioning

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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Modeling and optimization of a shell and louvered fin mini-tubes heat exchanger in an ORC powered by an internal combustion engine

Cited by 53 publications

References 42 publications

An Organic Rankine Cycle Bottoming a Diesel Engine Powered Passenger Car

An Organic Rankine Cycle Bottoming a Diesel Engine Powered Passenger Car

Organic Rankine cycle systems for engine waste-heat recovery: Heat exchanger design in space-constrained applications

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

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