Comparison of Conventional and Advanced Exergy Analysis for Dual-Loop Organic Rankine Cycle used in Engine Waste Heat Re
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https://doi.org/10.1007/s11630-020-1299-x
Article ID: 1003-2169(2020)00-0000-00
Comparison of Conventional and Advanced Exergy Analysis for Dual-Loop Organic Rankine Cycle used in Engine Waste Heat Recovery WANG Zhiqi, HU Yanhua, XIA Xiaoxia* Institute of Mechanical Engineering, Xiang Tan University, Xiangtan 411105, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: At present, the dual-loop organic Rankine cycle (DORC) is regarded as an important solution to engine waste heat recovery (WHR). Compared with the conventional exergy analysis, the advanced exergy analysis can better describe the interactions between system components and the irreversibility caused by economic or technical limitations. In order to systematically study the thermodynamic performance of DORC, the conventional and advanced exergy analyses are compared using an inline 6-cylinder 4-stroke turbocharged diesel engine. Meanwhile, the sensitivity analysis is implemented to further investigate the influence of operating parameters on avoidable-endogenous exergy destruction. The analysis result of conventional exergy analysis demonstrates that the priorities for the components that should be improved are in order of the high-temperature evaporator, the low-temperature turbine, the first low-temperature evaporator and the high-temperature condenser. The advanced exergy analysis result suggests that the avoidable exergy destruction values are the highest in the low-temperature turbine, the high-temperature evaporator and the high-temperature turbine because they have considerable endogenous-avoidable exergy destruction. The sensitivity analysis indicates that reducing the evaporation pinch point and raising the turbine efficiency can decrease the avoidable exergy destruction.
Keywords: advanced exergy analysis, conventional exergy analysis, dual-loop organic Rankine cycle (DORC), internal combustion engine, waste heat recovery (WHR)
1. Introduction As the main oil-consuming equipment, about 2/3 of fossil fuel is depleted by internal combustion engines (ICEs) [1]. Nevertheless, almost 60% to 70% of the combustion heat is dissipated through the exhaust and engine coolant, which results in energy waste and emission issues [2]. If the waste heat is recycled efficiently, the engine fuel economy and environmental pollution can be extremely released. He et al. [3] presented a steady-state experiment on energy balance and exergy analysis of exhaust gas in order to improve the waste heat recovery (WHR) of an ICE. The latest Received: Jun 12, 2019
AE: WANG Liwei
developments and technologies on turbocompounding have been reviewed by Aghaali et al. [4]. Saidur et al. [5] focused on the latest developments and technologies on WHR of exhaust gas from ICE. Therefore, the waste heat recovery for internal combustion engines (ICE-WHR) is considered as a kind of promising solution to improve the engine thermal efficiency [6]. Organic Rankine Cycle (ORC) has attracted more an
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