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Comprehensive assessment of the impact of operating parameters on sub 1- kW compact ORC performance

机译：全面评估运行参数对1 kW以下紧凑型ORC性能的影响

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摘要

The heat source and sink temperatures are important external variables that determine the performance of power cycles, such as the ideal Carrot cycle and Rankine cycle. In addition to these external operating variables, variations in the mass flow rate within the system can significantly change the operating characteristics of the power cycle. In this study, the combined effects of these operating variables on the compact Rankine cycle performance were investigated experimentally. A compact ORC with R245fa working fluid and scroll expander was experimentally evaluated at 100-140 degrees C heat source, 10-30 degrees C heat sink and 0.042-0.060 kg/s mass flow rate conditions.Comprehensive experiments showed that the external parameters have significant effects on ORC operating temperature and pressure. In particular, the electrical output was well predicted by the parameter of change in the pressure difference rather than the expansion ratio of the expander. It was also found that the mechanical efficiency of expander increased nonlinearly when decreasing the heat source temperature and increasing the pressure difference of expander. The generator efficiency was not affected by the operating parameters as the expander rotational speed was linearly proportional to the electrical power. The maximum system performance showed 0.246 kW electrical output and 1.61% thermal efficiency in contrast to 0.796 kW net fluidic output and 5.72% fluidic thermal efficiency where they were in different conditions.
机译：热源和散热器温度是决定电源循环性能的重要外部变量，例如理想的胡萝卜循环和朗肯循环。除了这些外部操作变量外，系统内质量流率的变化还会显着改变功率循环的操作特性。在这项研究中，实验研究了这些工作变量对紧凑的兰金循环性能的综合影响。在100-140摄氏度的热源，10-30摄氏度的散热器和0.042-0.060千克/秒的质量流量条件下，对带有R245fa工作流体和涡旋膨胀机的紧凑型ORC进行了实验评估。综合实验表明，外部参数具有重要意义对ORC工作温度和压力的影响。特别地，通过压力差的变化参数而不是膨胀机的膨胀率来很好地预测电输出。还发现，当降低热源温度并增加膨胀机的压差时，膨胀机的机械效率呈非线性增加。发电机效率不受操作参数的影响，因为膨胀机的旋转速度与电功率成线性比例。最高系统性能显示出0.246 kW的电输出和1.61％的热效率，而在不同条件下的净流体输出为0.796 kW，流体热效率为5.72％。

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