Waste heat recovery is an effective method for improving engine efficiency. While most research on waste heat recovery from heavy-duty engines focuses on the high-temperature heat sources, this paper investigates the performance of a low-temperature system. The experimental setup features an organic Rankine cycle with R1233zd(E) as the working fluid recovering heat from the coolant of a heavy-duty Diesel engine. Experiments at multiple engine operating points indicated a maximum operating cycle pressure of 8 bar and temperature of 92 °C. Between 0.1 and 0.7 kW net shaft power was achieved with a thermodynamic efficiency between 1.1 and 1.8%, resulting in a maximum expander power of 0.7% relative to the engine power. A simple empirical model based on the experimental results indicated that approximately 0.7% of the engine’s energy could be recovered during a driving cycle, rising to 1.3% if a high efficiency pump and expander are used. The main contribution of this paper lies in the presentation of the experimental setup and experimental results specifically dedicated to recovering the heat from the engine coolant, which permits realistic evaluation of the performance.

余热回收是提高发动机效率的有效方法。虽然大多数关于重型发动机废热回收的研究都集中在高温热源上，但本文研究了低温系统的性能。实验装置采用有机朗肯循环，其中 R1233zd(E) 作为工作流体从重型柴油​​发动机的冷却液中回收热量。在多个发动机工作点进行的实验表明，最大工作循环压力为 8 bar，温度为 92 °C。实现了 0.1 到 0.7 kW 的净轴功率，热力学效率在 1.1 到 1.8% 之间，导致相对于发动机功率的最大膨胀机功率为 0.7%。基于实验结果的简单经验模型表明，大约 0. 在一个驱动循环中可以回收 7% 的发动机能量，如果使用高效泵和膨胀机，则可以提高到 1.3%。本文的主要贡献在于介绍了专门用于从发动机冷却液中回收热量的实验装置和实验结果，从而可以对性能进行实际评估。