不同形状的弹簧丝涡轮对改善太阳能空气加热器传热效果的影响;数值模拟

IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Cleaner Engineering and Technology Pub Date : 2024-07-14 DOI:10.1016/j.clet.2024.100777
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引用次数: 0

摘要

本研究采用三维验证 CFD 仿真流程,评估了装有弹簧丝涡轮的太阳能空气加热器(SAH)的传热和性能特征。研究了五种不同形状的弹簧丝(如图表摘要所示),并与平面 SAH(无涡轮)进行了比较。针对上述五种几何形状,全面分析了螺旋直径、螺距和钢丝直径对系统性能的影响。结果表明,涡轮能显著提高吸收器截面内 SAH 的热效率。与其他截面形状相比,矩形截面形状显示出更高的增强 Nu 数。然而,考虑到传热和压降,圆形涡轮表现出最佳性能。螺旋直径、螺旋间距和金属丝直径越大,Nu/Nus 的值就会分别增加、减少和增加。一般来说,Nu 值越大,泵送功率也越大,这也是考虑热液压性能参数(THPP)的原因。较大的螺旋直径和螺旋间距会分别降低和提高热液压性能。例如,当螺距从 50 毫米增加到 250 毫米时,圆形涡轮的 THPP 上升了约 17.5%。然而,线径对 THPP 的影响并没有呈现出统一的曲线趋势,而是取决于涡轮机的形状。这项研究对于优化带涡轮的 SAH 的性能非常有用,为提高设备效率铺平了道路。
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Effect of spring-wire turbulators with different shapes on heat transfer improvement of solar air heaters; A numerical simulation

This study evaluates the heat transfer and performance characteristics of a solar air heater (SAH) equipped with spring-wire turbulators using a 3D verified CFD simulation process. Five different shapes of spring-wire (as shown in the graphical abstract) are investigated and compared to a flat SAH (without turbulator). The effects of helical diameter, pitch, and wire diameter on the performance of the system are comprehensively analyzed for all five mentioned geometries. The results reveal that the turbulator significantly enhances the thermal efficiency of the SAH within the absorber section. Rectangular cross section shape shows higher enhanced Nu number compared to the other cross section shapes. However, considering both heat transfer and pressure drop, the circular turbulator exhibits the optimal performance. Larger helical diameter, helical pitch and wire diameter, augments, decreases and increases the value of Nu/Nus respectively. Generally, higher increased Nu number also shows higher pumping power as well and that is why thermohydraulic performance parameter (THPP) is considered as well. Larger helical diameter, and helical pitch decreases and increases thermohydraulic performance respectively. For instance, the circular turbulator's THPP rises by approximately 17.5% as the pitch increases from 50 mm to 250 mm. However, the impact of wire diameter on THPP does not show a unified curve trend and depends on the shape of the turbulator. This study is remarkably useful for optimizing the performance of SAHs with turbulators, paving the way for enhanced device efficiency.

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来源期刊
Cleaner Engineering and Technology
Cleaner Engineering and Technology Engineering-Engineering (miscellaneous)
CiteScore
9.80
自引率
0.00%
发文量
218
审稿时长
21 weeks
期刊最新文献
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