Simulation and thermodynamic analysis of a bottoming Organic Rankine Cycle (ORC) of diesel engine (DE)
Simulation and thermodynamic analysis of a bottoming Organic Rankine Cycle (ORC) of diesel engine (DE)
复制标题
柴油机 (DE) 触底有机朗肯循环 (ORC) 的仿真和热力学分析
DOI：
10.1016/j.energy.2012.10.054
复制
发表时间：
2013-03
期刊：
影响因子：
9
通讯作者：
Liu, Lina
中科院分区：
文献类型：
--
作者：
Shu, Gequn;Tian, Hua;Wei, Haiqiao;Liu, Lina
以某型柴油机有机朗肯循环（ORC）为研究对象，建立了柴油机有机朗肯循环系统的仿真模型。ORC系统被构建为使用R245fa作为工作流体从发动机废气和水套水回收废热。通过数值模拟和热力学分析，考察了蒸发压力和柴油机工况对系统性能的影响。对余热吸收、膨胀功率、系统效率、火用损失和火用效率进行了综合评价。最后对柴油机与底部有机朗肯循环（DE-ORC）的组合系统进行了研究。结果表明，在发动机从高负荷到低负荷的工况下，排气余热和水套水余热的回收率分别约为75%和9.5%。在发动机额定工况下，ORC系统性能良好，膨胀功率达到14.5kW，回收效率达到9.2%，（火用）效率达到21.7%。结合底部ORC系统，柴油机热效率可提高6.1%。
This paper presents a simulation model based on an actual Organic Rankine Cycle (ORC) bottoming system of a diesel engine. The ORC system is built to recover waste heat both from engine exhaust gas and jacket water using R245fa as working fluid. Simulations and thermodynamic analyses are conducted to observe the influence of evaporating pressure and diesel engine (DE) conditions on system performance. Comprehensive evaluations are carried out on waste heat absorbing, expansion power, system efficiency, exergy loss and exergy efficiency. The combined system of diesel engine with bottoming ORC (DE-ORC) is finally investigated. Results indicate that, approximately 75% and 9.5% of waste heat from exhaust gas and from jacket water respectively can be recovered under the engine conditions ranging from high load to low load. The ORC system performances well under the rated engine condition with expansion power up to 14.5 kW, recovery efficiency up to 9.2% and exergy efficiency up to 21.7%. Combined with bottoming ORC system, thermal efficiency of diesel engine can be improved up to 6.1%.
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