Transient Power Optimization of an Organic Rankine Cycle Waste Heat Recovery System for Heavy-Duty Diesel Engine Applications

SAE International Journal of Alternative Powertrains Pub Date : 2017-03-28 DOI:10.4271/2017-01-0133

Bin Xu, Adamu Yebi, S. Onori, Z. Filipi, Xiaobing Liu, J. Shutty, Paul Anschel, Mark A. Hoffman

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引用次数: 24

Abstract

This paper presents the transient power optimization of an organic Rankine cycle waste heat recovery (ORC-WHR) system operating on a heavy-duty diesel (HDD). The optimization process is carried on an experimentally validated, physics-based, high fidelity ORC-WHR model, which consists of parallel tail pipe and EGR evaporators, a high pressure working fluid pump, a turbine expander, etc. Three different ORC-WHR mixed vapor temperature (MVT) operational strategies are evaluated to optimize the ORC system net power: (i) constant MVT; (ii) constant superheat temperature; (iii) fuzzy logic superheat temperature based on waste power level. Transient engine conditions are considered in the optimization. Optimization results reveal that adaptation of the vapor temperature setpoint based on evaporation pressure strategy (ii) provides 1.1% mean net power (MNP) improvement relative to a fixed setpoint strategy (i). The highest net power is produced by setpoint strategy (iii), which exhibited a 2.1% improvement compared strategy (i), revealing importance of utilizing engine conditions during reference trajectory generation. These results serve as the benchmark for the ORC system net power optimal control. CITATION: Xu, B., Yebi, A., Onori, S., Filipi, Z. et al., "Transient Power Optimization of an Organic Rankine Cycle Waste Heat Recovery System for Heavy-Duty Diesel Engine Applications," SAE Int. J. Alt. Power. 6(1):2017, doi:10.4271/2017-01-0133. Published 03/28/2017 Copyright © 2017 SAE International doi:10.4271/2017-01-0133 saealtpow.saejournals.org 25 Downloaded from SAE International by Brought to you by Stanford University, Friday, August 31, 2018

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用于重型柴油机的有机朗肯循环废热回收系统的瞬态功率优化

本文介绍了在重型柴油机（HDD）上运行的有机朗肯循环废热回收（ORC-WHR）系统的瞬态功率优化。优化过程是在实验验证的、基于物理的高保真ORC-WHR模型上进行的，该模型由并联尾管和EGR蒸发器、高压工作流体泵、涡轮膨胀机等组成。评估了三种不同的ORC-WR-混合蒸汽温度（MVT）操作策略，以优化ORC系统的净功率：（i）恒定MVT；（ii）恒定的过热温度；（iii）基于废物功率水平的模糊逻辑过热温度。优化中考虑了发动机的瞬态工况。优化结果表明，基于蒸发压力策略（ii）的蒸汽温度设定点的自适应相对于固定设定点策略（i）提供了1.1%的平均净功率（MNP）改进。设定点策略（iii）产生了最高的净功率，与策略（i）相比，该策略提高了2.1%，揭示了在参考轨迹生成过程中利用发动机条件的重要性。这些结果可作为ORC系统净功率最优控制的基准。引用：Xu，B.，Yebi，A.，Onori，S.，Filippi，Z.等人，“用于重型柴油机应用的有机朗肯循环废热回收系统的瞬态功率优化”，SAE Int.J.Alt.Power。6（1）：2017，doi:10.4271/2017-01-133。出版日期：2017年3月28日版权所有©2017 SAE International doi:10.4271/2017-01-133 saealtpow.saejurnals.org 25斯坦福大学Brought于2018年8月31日星期五从SAE International下载

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来源期刊

SAE International Journal of Alternative Powertrains TRANSPORTATION SCIENCE & TECHNOLOGY-

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期刊介绍： The SAE International Journal of Alternative Powertrains provides a forum for peer-reviewed scholarly publication of original research and review papers that address challenges and present opportunities in alternative and electric powertrains and propulsion technology. The Journal strives to facilitate discussion between researchers, engineers, academic faculty and students, and industry practitioners working with systems as well as components, and the technological aspects and functions of powertrains and propulsion systems alternative to the traditional combination of internal combustion engine and mechanical transmission. The editorial scope of the Journal includes all technical aspects of alternative propulsion technologies, including, but not limited to, electric drives and electromobility systems, hybrid technology, battery and super-capacitor technology, power electronics, hydraulic drives, energy storage systems for automotive applications, fuel cell technology, and charging and smart grid infrastructures.