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首页> 外文期刊>Energy Conversion & Management >Comparison of different layouts for the integration of an organic Rankine cycle unit in electrified powertrains of heavy duty Diesel trucks
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Comparison of different layouts for the integration of an organic Rankine cycle unit in electrified powertrains of heavy duty Diesel trucks

机译：重型柴油卡车电气化动力总成中有机朗肯循环单元集成的不同布局比较

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In the last years an increasing interest has grown about the organic Rankine cycle (ORC) for waste heat recovery from the engine exhausts, as a feasible way to improve the efficiency of internal combustion engines (ICE). However, the highly variable working conditions in which an engine usually works make the operation of the ORC unit very challenging. In the management of ORC units, optimization and control are considered as an essential step in order to attain good performance during the whole operation of the ICE on a driving cycle. In this paper a GT-Power model of a 12.61 turbocharged Diesel engine is used as a typical heavy duty Diesel engine to retrieve the temperature and the mass flow rate of the exhaust gases during a heavy heavy-duty driving cycle. An optimization process is performed to maximize the power output of the ORC as a function of the revolution speeds of the pump and of the turbine. For powertrain electrification purposes, two different ORC layouts are proposed in this paper, both seeking to store the recovered energy into a battery pack. The first layout is optimized based on mean values of exhausts temperature and mass flow rate, while the second layout is designed to control independently the revolutions of the pump and of the turbine of the ORC unit toward optimal values for maximum net power output. Both the layouts allow to recover an interesting amount of energy, in spite of a straightforward control strategy. Nonetheless, results show that optimizing the net power of the ORC cycle by decoupling the turbine and the pump may not ensure the maximization of the recovered energy. In fact, the storable energy from the ORC unit is strongly affected by the conversion efficiencies related to the specific layout.
机译：近年来，人们越来越关注有机朗肯循环（ORC），用于从发动机排气中回收废热，以此作为提高内燃机（ICE）效率的可行方法。然而，发动机通常工作的高度可变的工作条件使得ORC单元的操作非常具有挑战性。在ORC单元的管理中，优化和控制被认为是必不可少的步骤，以便在ICE整个驾驶循环过程中获得良好的性能。在本文中，将12.61涡轮增压柴油机的GT-Power模型用作典型的重型柴油机，以在重型重载驾驶循环中获取废气的温度和质量流率。执行优化过程以根据泵和涡轮的转速最大化ORC的功率输出。出于动力总成电气化的目的，本文提出了两种不同的ORC布局，它们都试图将回收的能量存储到电池组中。根据排气温度和质量流率的平均值优化第一种布局，而第二种布局则设计成可独立控制ORC单元的泵和涡轮的转速，以达到最大净功率输出的最佳值。尽管采用了简单的控制策略，但两种布局都可以回收大量有趣的能量。但是，结果表明，通过使涡轮机和泵去耦来优化ORC循环的净功率可能无法确保回收的能量最大化。实际上，来自ORC单元的可存储能量受到与特定布局有关的转换效率的强烈影响。

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