Optimal design of organic Rankine cycles for exhaust heat recovery from light-duty vehicles in view of various exhaust gas conditions and negative aspects of mobile vehicles

Wu, Xialai; Chen, Junghui; Xie, Lei

doi:10.1016/j.applthermaleng.2020.115645

Cited by 21 publications

(14 citation statements)

References 37 publications

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“…A percentage factor is assigned to each engine operating point, as shown in the rightmost column of Table 3. It represents the percentage of time at each operating point during engine operation [8]. A well-designed ORC should be able to work in different exhaust conditions through the adjustment of ORC operating conditions.…”

Section: System Descriptionmentioning

confidence: 99%

“…It was reported that a potential fuel consumption improvement of around 10% for ICE would be obtained if 6% of the heat in exhaust gas can be recovered and converted into useful mechanical power [3,4]. In the literature, the waste exhaust heat can be recovered through turbo-compounding [5], thermofluidic oscillators [6], thermoelectric generators [7], organic Rankine cycle (ORC) [8,9], etc. Among the aforementioned methods of the ICEs waste heat recovery, the ORC is a widely studied and well-recognized method because of its simple configuration, high waste heat utilization, and reliability [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The operating parameters were optimized to improve the thermoeconomic and environmental performance of DORC, but the negative factors, such as the back pressure imposed by the ORC unit installation, were not considered. Wu et al proposed an ORC optimization method considering various major exhaust conditions of a light-duty vehicle and the negative effects of ORC weight and back pressure [8]. The results highlighted the necessity of taking the multiple main exhaust conditions and the negative effects into account during the optimization design of ORC.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Xie

et al. 2022

Energies

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The organic Rankine cycle (ORC) has been widely studied to recover waste heat from internal combustion engines in commercial on-road vehicles. To achieve a cost-effective ORC, a trade-off between factors such as costs, power outputs, back pressure, and weight needs to be carefully worked out. However, the trade-off is still a huge challenge in engine waste heat recovery. In this study, a thermoeconomic optimization study of a vehicle-mounted ORC unit is proposed to recover waste heat from various exhaust gas conditions of a light-duty vehicle. The optimization is carried out for four organic working fluids with different critical temperatures, respectively. Under the investigated working fluids, the lower specific investment cost (SIC) and higher mean net output power (MEOP) of ORC can be achieved using the organic working fluid with higher critical temperature. The maximum mean net output power is obtained by taking RC490 as working fluid and the payback period (PB) is 3.01 years when the petrol is EUR 1.5 per liter. The proposed strategy is compared with a thermodynamic optimization method with MEOP as an optimized objective. It shows that the proposed strategy reached SIC results more economically. The importance of taking the ORC weight and the back pressure caused by ORC installation into consideration during the preliminary design phase is highlighted.

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Section: System Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Zhang

Xie

et al. 2022

Energies

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“…Beside flue gases at power generation, there is a lot of heat wasted with exhaust gases in chemical, petrochemical, food, transport, communal and other sectors. It is exhaust gases from buildings space heating (Dudkiewicz and Szałański 2020), commercial kitchens (Wang et al 2020b), transport heavy vehicles (Daccord 2017), light-duty vehicles (Wu et al 2020), ceramics treatment in kiln (Montorsi et al 2018), drying of food products with air (Julklang and Golman 2015), spray drying with air (Patel and Bade 2020), steam drying of algae (Aziz et al 2013), spray drying for particles production (Julklang and Golman 2015). In all these applications the content of vapour in the exhaust gas can vary significantly and so the share of sensible and latent heat for recovery.…”

Section: Introductionmentioning

confidence: 99%

Integration of low-grade heat from exhaust gases into energy system of the enterprise

Kapustenko

Arsenyeva

Fedorenko

et al. 2021

Clean Techn Environ Policy

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In the paper is presented the way of Process Integration application for waste heat utilisation from exhaust gases streams with partial condensation. It is based on the construction of Hot Composite Curve representing the gaseous mixture cooling with accounting for the gas-liquid equilibrium of condensable vapour part. With Cold Composite Curve for streams requiring heating, the Pinch Point is determined. Then the structure of Heat Exchanger Network (HEN) for utilised Heat Integration into the energy system of the factory is developed accounting for the possible splitting of two-phase flow on gas and liquid streams and selection of plate heat exchanger (PHE) types for specific positions in HEN. The method is illustrated by a case study of heat utilisation from exhaust gases after superheated steam tobacco drying and flue gases from natural gas-fired boiler. The heat transfer areas of PHEs in HEN are optimised with the total annualised cost as an objective function. The payback period of the received solution is less than four months with a substantial saving of energy, reduction of greenhouse gases and other harmful emissions of combustion processes.

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“…Compared with marine engines and stationary IC engines with relatively stable waste heat energy, the variable operating conditions of vehicle IC engines have led to the complexity and variability of the waste heat energy [8]. Due to the frequent changes in operating conditions of IC engines for vehicles, the organic Rankine cycle (ORC) system cannot have enough work capacity under most operating conditions of IC engines.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Characteristics Analysis and Energy, Exergy, and Economic (3E) Evaluation of Dual Loop Organic Rankine Cycle (DORC) for CNG Engine Waste Heat Recovery

Yao

Zhang

2021

Energies

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Frequent fluctuations of CNG engine operating conditions make the waste heat source have uncertain, nonlinear, and strong coupling characteristics. These characteristics are not conducive to the efficient recovery of the DORC system. The systematic evaluation of the CNG engine waste heat source and the comprehensive performance of the DORC system is conducive to the efficient use of waste heat. Based on the theory of internal combustion (IC) engine thermal balance, this paper analyzes the dynamic characteristics of compressed natural gas (CNG) engine waste heat energy under full operating conditions. Then, based on the operating characteristics of the dual loop organic Rankine cycle (DORC) system, thermodynamic models, heat transfer models, and economic models are constructed. The dynamic response characteristics analysis and energy, exergy, and economic (3E) evaluation of the DORC system under full operating conditions are carried out. The results show that the maximum values of net power output, heat exchange area, and the minimum values of EPC (electricity production cost) and PBT (payback time) are all obtained under rated condition, which are 174.03 kW, 25.86 kW, 37.54 kW, 24.76 m2, 0.15 $/kW·h and 3.46 years. Therefore, the rated condition is a relatively ideal design operating point for the DORC system. The research in this paper not only provides a reliable reference for the comprehensive analysis and evaluation of the performance of the DORC system, but also provides useful guidance for the selection of appropriate DORC system design operating points.

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Optimal design of organic Rankine cycles for exhaust heat recovery from light-duty vehicles in view of various exhaust gas conditions and negative aspects of mobile vehicles

Cited by 21 publications

References 37 publications

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

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

Integration of low-grade heat from exhaust gases into energy system of the enterprise

Dynamic Response Characteristics Analysis and Energy, Exergy, and Economic (3E) Evaluation of Dual Loop Organic Rankine Cycle (DORC) for CNG Engine Waste Heat Recovery

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