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Parametric optimization and heat transfer analysis of a dual loop ORC (organic Rankine cycle) system for CNG engine waste heat recovery

机译：用于CNG发动机余热回收的双回路ORC（有机朗肯循环）系统的参数优化和传热分析

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摘要

In this study, a dual loop ORC (organic Rankine cycle) system is adopted to recover exhaust energy, waste heat from the coolant system, and intercooler heat rejection of a six-cylinder CNG (compressed natural gas) engine. The thermodynamic, heat transfer, and optimization models for the dual loop ORC system are established. On the basis of the waste heat characteristics of the CNG engine over the whole operating range, a GA (genetic algorithm) is used to solve the Pareto solution for the thermodynamic and heat transfer performances to maximize net power output and minimize heat transfer area. Combined with optimization results, the optimal parameter regions of the dual loop ORC system are determined under various operating conditions. Then, the variation in the heat transfer area with the operating conditions of the CNG engine is analyzed. The results show that the optimal evaporation pressure and superheat degree of the HT (high temperature) cycle are mainly influenced by the operating conditions of the CNG engine. The optimal evaporation pressure and superheat degree of the HT cycle over the whole operating range are within 2.5–2.9 MPa and 0.43–12.35 K, respectively. The optimal condensation temperature of the HT cycle, evaporation and condensation temperatures of the LT (low temperature) cycle, and exhaust temperature at the outlet of evaporator 1 are kept nearly constant under various operating conditions of the CNG engine. The thermal efficiency of the dual loop ORC system is within the range of 8.79%–10.17%. The dual loop ORC system achieves the maximum net power output of 23.62 kW under the engine rated condition. In addition, the operating conditions of the CNG engine and the operating parameters of the dual loop ORC system significantly influence the heat transfer areas for each heat exchanger.
机译：在这项研究中，采用双回路ORC（有机朗肯循环）系统来回收废气，冷却液系统的废热以及六缸CNG（压缩天然气）发动机的中间冷却器散热。建立了双回路ORC系统的热力学，传热和优化模型。根据CNG发动机在整个工作范围内的余热特征，使用GA（遗传算法）求解帕累托解决方案的热力学和热传递性能，以最大化净功率输出并最小化热传递面积。结合优化结果，确定了各种工作条件下双回路ORC系统的最优参数区域。然后，分析了传热面积随CNG发动机工况的变化。结果表明，高温（高温）循环的最佳蒸发压力和过热度主要受CNG发动机工况的影响。在整个工作范围内，HT循环的最佳蒸发压力和过热度分别在2.5–2.9 MPa和0.43–12.35 K之间。在CNG发动机的各种运行条件下，HT循环的最佳冷凝温度，LT（低温）循环的蒸发和冷凝温度以及蒸发器1出口的排气温度几乎保持恒定。双回路ORC系统的热效率在8.79％–10.17％的范围内。双回路ORC系统在发动机额定条件下可实现23.62 kW的最大净功率输出。另外，CNG发动机的运行条件和双回路ORC系统的运行参数会显着影响每个热交换器的传热面积。

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