The absorber plate surface modifications of a solar air heater (SAH) increase the convective heat transfer rate of the inlet air. Forced convection heat transfer of air in a SAH with a staggered arrangement of conical obstacles has been carried out experimentally and numerically at mass flow rates (0.04, 0.08, and 0.1 kg/s) under ambient conditions for the aim of to enhance the thermal efficiency and to create proper volume for heat storage material in terms of the effectiveness of the SAH. The thermal efficiency for the absorber with conical obstacles was 14.0, 14.6, and 11.8% higher than the flat absorber plate for the mass flow rates, respectively. The results show that the number of Nusselt obtained in conical surface experiments was highest for all cases tested regardless of Reynolds number. The experimental results are compared with the numerical results obtained by the CFD method. The model results indicate good agreement with the experimental results. Also, the results show that the heat transfer in front of the conical elements is high, and the back is low; in the smooth absorber, a linear velocity distribution is seen along the channel; however, in the conical surface absorber, the velocity distribution due to turbulence is very variable.

太阳能空气加热器（SAH）的吸收板表面改型提高了进气的对流传热速率。为了提高热效率，已经在环境条件下以质量流量（0.04、0.08和0.1 kg / s）通过实验和数值方法对SAH中的空气进行了强制对流换热，其中锥形障碍物错开排列并根据SAH的有效性为储热材料创造合适的体积。对于质量流量，带有锥形障碍物的吸收器的热效率分别比平板吸收器板高14.0、14.6和11.8％。结果表明，无论雷诺数如何，在锥形表面实验中获得的Nusselt数量对于所有测试情况而言都是最高的。将实验结果与通过CFD方法获得的数值结果进行比较。模型结果表明与实验结果吻合良好。结果还表明，圆锥形元件前部的传热高，而背面部的传热低。在光滑吸收器中，沿通道可见线速度分布。然而，在锥形表面吸收器中，由于湍流引起的速度分布是非常可变的。