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Case studies on the effect of two-dimensional heliostat tracking on the performance of domestic scale solar thermal tower
Case Studies in Thermal Engineering ( IF 6.8 ) Pub Date : 2020-06-10 , DOI: 10.1016/j.csite.2020.100681
Hafiz Muhammad Ashraf Hayat , Salman Hussain , Hafiz Muhammad Ali , Naveed Anwar , Muhammad Nadeem Iqbal

Solar thermal system has been envisioned for utility scale applications. However, on the low end the domestic applications can be made realizable through low end automation. Performance of typical solar reflector can be significantly enhanced by using a solar tracking system. An efficient & low energy consuming system can result in improved energy harvesting. In the current study, an experimental analysis of automated domestic scale heliostat field using rack and pinion-based mechanism is performed. The mechanism is controlled using relay module with an Arduino UNO R3-SMD. Experiments are performed in actual working conditions of Taxila, Pakistan. The heliostat field is made to reflect the solar rays to a cavity type central receiver (CTCR) having stainless steel tubing. Experimentations were performed under three different scenarios-tracking using one dimensional (1D) with fixed position heliostats, tracking using two dimensional (2D) with 5 variable positioning heliostats, and tracking using 2D with 8 variable positioning heliostats. The performances of each setup is analyzed parameters such as heating fluid, temperature difference (ΔT), absorbed heat (Qabs), and overall efficiency (ƞ). Performance enhancement was observed using 2D tracking with 8 variable positioning heliostats where ΔT was 64.26 °C, Qabs was 489.89 W, with maximum ƞ was 52.8%. In 2D with 5 variable positioning heliostats and 1D with fixed heliostats, the values obtained were 50.3 °C, 385.5 W, 51.83% and 6.523 °C, 50 W, 45.86% respectively.



中文翻译:

二维定日镜跟踪对家用规模太阳能热塔性能影响的案例研究

已经设想了太阳能热系统用于公用事业规模的应用。但是,在低端,可以通过低端自动化来实现家庭应用。通过使用太阳能跟踪系统,可以显着提高典型太阳能反射器的性能。高效,低能耗的系统可以改善能量收集。在当前的研究中,使用基于齿条和小齿轮的机制对自动家用定日镜场进行了实验分析。该机制是通过带有Arduino UNO R3-SMD的继电器模块来控制的。在巴基斯坦塔西拉的实际工作条件下进行实验。使定日镜场将太阳光线反射到具有不锈钢管的腔型中央接收器(CTCR)。实验是在三种不同的情况下进行的:使用具有固定位置定日镜的一维(1D)跟踪,使用具有5个可变位置定日镜的二维(2D)跟踪以及使用具有8个可变位置定日镜的2D跟踪。分析每种设置的性能,例如加热流体,温差(ΔT),吸收的热量(Qabs)和整体效率(ƞ)。使用具有8个可变位置定日镜的2D跟踪观察到性能增强,其中ΔT为64.26°C,Q abs为489.89 W,最大ƞ为52.8%。在具有5个可变位置定日镜的2D和具有固定定日镜的1D中,获得的值分别为50.3°C,385.5 W,51.83%和6.523°C,50 W,45.86%。

更新日期:2020-06-10
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