This paper presents the development of the Nusselt number and friction factor correlations of a solar air collector with inclined baffles on the basis of experimental data. An evaluation of the exergy performance of the collector is conducted. The inclination angle of the baffle studied ranges from 0° to 180°. The baffle pitch and size of the solar air heater duct are fixed in the current work. The maximum errors between the predictions of the correlations and the experimental data are 6% for the Nusselt number and 8.3% for the friction factor. The exergy efficiency analysis shows that the largest collector efficiency of 0.7% is reached at a baffle angle of 60° and a Reynolds number of 1500. A baffle angle of 60° causes the highest turbulence due to an increased degree of blockage. Furthermore, the baffle angle results in a smaller friction factor than the others, e.g. 45° and 120°. The thermal efficiency, effective efficiency and exergy efficiency of the collector with baffle angles of 30° and 150° are nearly equal. A baffle angle of 0° indicates the lowest efficiency. Overall, it is suggested that baffle angles from 60° to 120° should be selected to obtain high efficiencies.

本文根据实验数据，介绍了带有倾斜挡板的太阳能集热器的努塞尔数和摩擦系数的相关性。对收集器的（火用）性能进行评估。所研究的挡板的倾斜角度为0°至180°。在目前的工作中，固定的挡板间距和太阳能空气加热器导管的尺寸是固定的。相关性的预测与实验数据之间的最大误差为：努塞尔数为6％，摩擦系数为8.3％。火用效率分析表明，挡板角为60°，雷诺数为1500时，收集器效率最高，为0.7％。挡板角为60°时，由于堵塞程度的增加，湍流最大。此外，挡板角导致的摩擦系数比其他挡板小，例如45°和120°。挡板角为30°和150°的集热器的热效率，有效效率和火用效率几乎相等。挡板角度为0°表示效率最低。总的来说，建议选择从60°到120°的挡板角以获得高效率。