当前位置: X-MOL 学术Sol. Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Heat transfer and performance analysis of SAH having new transverse finned absorber of lateral gaps and central holes
Solar Energy ( IF 6.7 ) Pub Date : 2021-09-13 , DOI: 10.1016/j.solener.2021.08.061
Hamdy Hassan , Saleh AboElfadl

An experimental work is presented on the performance of solar air heater (SAH) has new designed absorber of finned transverse plate of lateral gaps and central holes. Moreover, a complete heat transfer analysis of the radiation and convection and SAH thermal performance are presented and discussed. The performance of this transverse SAH (TR_SAH) is compared with identical conventional flat plate SAH (FP_SAH) for single (SP) and double-pass (DP) airflow and air mass flow rates (AMFR) of 0.025, 0.05, and 0.075 kg/s. The experimental study is performed under hot climate conditions of Upper Egypt. The findings show that for all studied cases, TR_SAH has higher energy gain, output air temperature, thermal efficiency, and Nusselt number on the absorber plate, thermal-hydraulic performance parameter, and pressure drop compared to FP_SAH. The energy loss and radiation and convection Nusselt number on the TR_SAH glass plate is lower than that of FP_SAH. The maximum TR_SAH energy efficiency of value of about 89% is achieved in the case of DP airflow and high AMFR of 0.075 kg/s, with an enhancement of 24.2% compared to FP_SAH. The higher TR_SAH efficiency at these conditions reflects the optimal TR_SAH absorber design especially at high AMFR and using DP airflow. Despite TR_SAH air pumping power is greater than FP_SAH but it has a negligible effect on net energy gain.



中文翻译:

具有横向间隙和中心孔的新型横向翅片吸收器SAH的传热和性能分析

对具有横向间隙和中心孔的新型翅片横板吸收器的太阳能空气加热器(SAH)的性能进行了实验工作。此外,还介绍并讨论了辐射和对流以及 SAH 热性能的完整传热分析。将这种横向 SAH (TR_SAH) 的性能与相同的传统平板 SAH (FP_SAH) 的单 (SP) 和双程 (DP) 气流和空气质量流量 (AMFR) 的性能进行比较,分别为 0.025、0.05 和 0.075 kg/ s。实验研究是在上埃及炎热的气候条件下进行的。结果表明,对于所有研究案例,与 FP_SAH 相比,TR_SAH 具有更高的能量增益、输出空气温度、热效率和吸收器板上的努塞尔数、热工水力性能参数和压降。TR_SAH玻璃板上的能量损失和辐射和对流努塞尔数低于FP_SAH。在 DP 气流和 0.075 kg/s 的高 AMFR 的情况下,实现了大约 89% 的最大 TR_SAH 能效值,与 FP_SAH 相比提高了 24.2%。在这些条件下更高的 TR_SAH 效率反映了最佳的 TR_SAH 吸收器设计,尤其是在高 AMFR 和使用 DP 气流时。尽管 TR_SAH 空气泵送功率大于 FP_SAH,但它对净能量增益的影响可以忽略不计。在这些条件下更高的 TR_SAH 效率反映了最佳的 TR_SAH 吸收器设计,尤其是在高 AMFR 和使用 DP 气流时。尽管 TR_SAH 空气泵送功率大于 FP_SAH,但它对净能量增益的影响可以忽略不计。在这些条件下更高的 TR_SAH 效率反映了最佳的 TR_SAH 吸收器设计,尤其是在高 AMFR 和使用 DP 气流时。尽管 TR_SAH 空气泵送功率大于 FP_SAH,但它对净能量增益的影响可以忽略不计。

更新日期:2021-09-14
down
wechat
bug