Thermoeconomic Optimization Design of the ORC System Installed on a Light-Duty Vehicle for Waste Heat Recovery from Exhaust Heat

Wu, Xialai; Zhang, Ning; Xie, Lei; Ci, Wenyan; Chen, Junghui; Lu, Shan

doi:10.3390/en15124486

Cited by 3 publications

(1 citation statement)

References 40 publications

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“…Size and mass constraints, very demanding for cars, are less significant for heavy road vehicles [15] and for marine applications, which are also characterized by a favorable engine operating profile [16]. The ORC system weight, size, and cost can be minimized, as well as system-produced power and reliability, can be maximized by means of plant design optimization [17][18][19][20][21]. Therefore, the results of these studies can be summarized by stating that the best solution for water heat recovery should consider multiple aspects, particularly for vehicle applications.…”

Section: Introductionmentioning

confidence: 99%

Waste Heat Recovery in a Compression Ignition Engine for Marine Application Using a Rankine Cycle Operating with an Innovative Organic Working Fluid

et al. 2022

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The exhaust heat of energy conversion systems can be usefully recovered by Organic Rankine Cycles (ORC) instead of wasting it into the environment, with benefits in terms of system efficiency and environmental impact. Rankine cycle technology, consolidated in stationary power plants, has not yet spread out into transport applications due to the layout limitations and to the necessity of containing the size and weight of the ORC system. The authors investigated an ORC system bottoming a compression ignition engine for marine application. The exhaust mass flow rate and temperature, measured at different engine loads, have been used as inputs for modeling the ORC plant in a Simulink environment. An energy and exergy analysis of the ORC was performed, as well as the evaluation of the ORC power at different engine loads. Two different working fluids were considered: R1233zd(e), an innovative fluid belonging to the class of hydrofluoroolefin, still in development but interesting due to its low flammability, health hazard, and environmental impact, and R601, a hydrocarbon showing a benchmark thermodynamic performance but highly flammable, considered as a reference for comparison. Three plant configurations were investigated: single-pressure, dual-pressure, and reheating. The results demonstrated that the dual-pressure configuration achieves the highest exploitation of exhaust heat. R1233zd(e) produced an additional mechanical power of 8.0% with respect to the engine power output, while, for R601, the relative contribution of the ORC power was 8.7%.

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Section: Introductionmentioning

confidence: 99%

Waste Heat Recovery in a Compression Ignition Engine for Marine Application Using a Rankine Cycle Operating with an Innovative Organic Working Fluid

et al. 2022

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Thermodynamic Analysis of the Integrated System that Produces Energy by Gradual Expansion from the Waste Heat of the Solid Waste Facility

ELBİR

2023

Hittite Journal of Science and Engineering

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The rapid increase in consumer societies means an increase in waste facilities. Especially considering the amount of power used in waste plants and the corresponding amount of waste heat, an approach to recover waste heat in these plants has been proposed. The waste heat from the solid waste facility was first evaluated in the rankine cycle. An ORC system has been added to the lower cycle of the steam rankine cycle. The integrated system was completed by adding the waste heat from the Rankin steam cycle to the carbon dioxide cycle. These power generating systems are designed with two turbines each with gradual expansion. 1 kg/s of air at 873.2 K was obtained by evaluating the waste heat with sub-cycles. In terms of energy efficiency, it is seen that the R744 cascade cycle has the highest energy and exergy efficiency. Cooling with water in heat exchangers reduces the exhaust efficiency. The mass flow requirement is highest in ORC, where R123 fluid is used. The energy efficiency for the entire system was calculated as 11.2% and the exergy efficiency for the entire system was calculated as 4%. When Exergo Environment Analysis was made, exergy stability factor was found to be 0.453, exergetic sustainability index was found to be 0.04 . There is also 370K waste heat. This is recommended for use in drying units. Calculations were made with the EES (Engineering Equation Solver) program.

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Waste Energy Recovery and Valorization in Internal Combustion Engines for Transportation

Battista

Cipollone

2023

Energies

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Internal Combustion Engines (ICE) are experiencing a transition era in which research and innovation are mainly pushed by environmental issues: emission reduction and fuel saving are indispensable requirements of the new technologies, otherwise the end of ICE is proposed in Europe. Modifications, in reality, are under discussion by 2026 but the environmental issues are anyway welcomed. In the transportation sector, today dominated by ICEs, it appears that the reduction in the propulsion power, hybridization at various degrees, and exhaust post-treatment improvements will guarantee technological solutions able to support the transition in the next couple of decades toward full electric propulsion. Waste Heat Recovery (WHR) is a very interesting opportunity since almost two-thirds of fuel energy is not converted into mechanically useful energy. Moreover, the integration with other thermal streams on board (cooling and lubricating mediums, EGR cooling) can add further value to the recovery opportunity as well as the concept of managing the engine thermal management which can produce a sensible contribution that is appreciated mainly during urban driving. A huge scientific effort is underway, and a great expectation is perceptible. More generally, the technological options that can achieve a reduction in overall fuel consumption and, thus, the improvement of global engine efficiency, are the most valuable when they can be introduced without massive changes to the engine layout. This happens in all the energy applications in which ICEs are involved since the recovery unit can be introduced in the exhaust line. The mechanical energy recovered can be easily transformed into electrical energy, so represents an interesting integration with the hybrid propulsion powertrains. In this paper, a review of the most important technologies referred to the WHR is presented, outlining advantages and drawbacks, and setting up the presently available technologies referred to the transportation sector.

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Thermoeconomic Optimization Design of the ORC System Installed on a Light-Duty Vehicle for Waste Heat Recovery from Exhaust Heat

Cited by 3 publications

References 40 publications

Waste Heat Recovery in a Compression Ignition Engine for Marine Application Using a Rankine Cycle Operating with an Innovative Organic Working Fluid

Waste Heat Recovery in a Compression Ignition Engine for Marine Application Using a Rankine Cycle Operating with an Innovative Organic Working Fluid

Thermodynamic Analysis of the Integrated System that Produces Energy by Gradual Expansion from the Waste Heat of the Solid Waste Facility

Waste Energy Recovery and Valorization in Internal Combustion Engines for Transportation

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