Parametric analysis of a dual loop Organic Rankine Cycle (ORC) system for engine waste heat recovery
Parametric analysis of a dual loop Organic Rankine Cycle (ORC) system for engine waste heat recovery
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DOI：
10.1016/j.enconman.2015.08.074
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发表时间：
2015-11-15
影响因子：
10.4
通讯作者：
Gu, Chun-wei
中科院分区：
文献类型：
--
作者：
Song, Jian;Gu, Chun-wei
提出了一种用于发动机余热回收的双回路有机朗肯循环（ORC）系统，该系统由高温（HT）回路和低温（LT）回路组成。HT回路回收发动机排气的废热，LT回路除了回收HT回路的余热之外还回收水套冷却水的废热。这两个回路通过共享的热交换器耦合，这意味着HT回路的冷凝器也是LT回路的蒸发器。选择环己烷、苯和甲苯作为高温回路的工作流体。HT回路设置不同的冷凝温度，以保持冷凝压力略高于大气压力。LT回路选择R123、R236 fa和R245 fa。通过参数分析，评价了高温回路冷凝温度和余热负荷对低温回路的影响。模拟结果表明，在HT回路不同的冷凝条件下，HT回路的夹点出现在不同的位置，导致蒸发温度等热力参数不同。在环己烷用于HT回路和R245fa用于LT回路的情况下，双回路ORC系统的最大净功率输出达到111.2 kW。由于发动机的原始功率输出为996 kW，因此双回路ORC系统产生的额外功率可以使发动机功率增加11.2%。(C)2015爱思唯尔有限公司版权所有。
This paper presents a dual loop Organic Rankine Cycle (ORC) system consisting of a high temperature (HT) loop and a low temperature (LT) loop for engine waste heat recovery. The HT loop recovers the waste heat of the engine exhaust gas, and the LT loop recovers that of the jacket cooling water in addition to the residual heat of the HT loop. The two loops are coupled via a shared heat exchanger, which means that the condenser of the HT loop is the evaporator of the LT loop as well. Cyclohexane, benzene and toluene are selected as the working fluids of the HT loop. Different condensation temperatures of the HT loop are set to maintain the condensation pressure slightly higher than the atmosphere pressure. R123, R236fa and R245fa are chosen for the LT loop. Parametric analysis is conducted to evaluate the influence of the HT loop condensation temperature and the residual heat load on the LT loop. The simulation results reveal that under different condensation conditions of the HT loop, the pinch point of the LT loop appears at different location, resulting in different evaporation temperatures and other thermal parameters. With cyclohexane for the HT loop and R245fa for the LT loop, the maximum net power output of the dual loop ORC system reaches 111.2 kW. Since the original power output of the engine is 996 kW, the additional power generated by the dual loop ORC system can increase the engine power by 11.2%. (C) 2015 Elsevier Ltd. All rights reserved.