Thermal performance improvement of artificially roughened solar air heater

IF 0.7 Q3 ENGINEERING, MULTIDISCIPLINARY
N. M. Bader, K. S. Mushatet
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引用次数: 1

Abstract

Solar air heaters are useful because they can lessen the need for fossil fuel–powered electricity, thereby lowering emissions and cutting down on energy costs. Experiments were conducted to inspect the thermal performance of a solar air heater with combined ribs and delta-winglet in a single-pass solar air heater. The present goal was boost the thermal performance of a solar air collector. A constant relative roughness height ratio of 0.6 was used to organize eight delta-winglets and seven rectangular ribs on the absorber duct's bottom surface. The attack angles for both winglets and ribs were maintained at 60° and 90°, respectively. The winglet vortex generators were set in a common flow-down configuration with a pitch ratio of 10. This experimental investigation was performed at a mass flow rate of 0.022 kg/s with typical ranges of solar irradiance from 330 W/m2 to 850 W/m2. Results show that the useful energy and thermal efficiency were enhanced by 19.2% and 21.2%, respectively, at maximum solar irradiance compared to a smooth duct. The considered compound ribs and vortex generators affect the temperature of the outlet air, resulting in a considerable improvement in the heat transfer convective rate.
人工粗化太阳能空气加热器的热性能改善
太阳能空气加热器是有用的,因为它们可以减少对化石燃料供电的需求,从而减少排放并降低能源成本。对单道太阳能空气加热器中肋部与三角小翼组合的热性能进行了试验研究。目前的目标是提高太阳能空气收集器的热性能。采用恒定的相对粗糙度高度比0.6来组织吸收管底表面的8个三角小翼和7个矩形肋。小翼和肋的攻角分别保持在60°和90°。小翼涡发生器设置为常见的降流配置,螺距比为10。本实验在质量流量为0.022 kg/s的条件下进行,典型的太阳辐照度范围为330 W/m2 ~ 850 W/m2。结果表明,在最大太阳辐照度下,与光滑风管相比,有效能和热效率分别提高了19.2%和21.2%。所考虑的复合肋和涡发生器影响了出口空气的温度,从而大大提高了换热对流率。
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来源期刊
Engineering Review
Engineering Review ENGINEERING, MULTIDISCIPLINARY-
CiteScore
1.00
自引率
0.00%
发文量
8
期刊介绍: Engineering Review is an international journal designed to foster the exchange of ideas and transfer of knowledge between scientists and engineers involved in various engineering sciences that deal with investigations related to design, materials, technology, maintenance and manufacturing processes. It is not limited to the specific details of science and engineering but is instead devoted to a very wide range of subfields in the engineering sciences. It provides an appropriate resort for publishing the papers covering prior applications – based on the research topics comprising the entire engineering spectrum. Topics of particular interest thus include: mechanical engineering, naval architecture and marine engineering, fundamental engineering sciences, electrical engineering, computer sciences and civil engineering. Manuscripts addressing other issues may also be considered if they relate to engineering oriented subjects. The contributions, which may be analytical, numerical or experimental, should be of significance to the progress of mentioned topics. Papers that are merely illustrations of established principles or procedures generally will not be accepted. Occasionally, the magazine is ready to publish high-quality-selected papers from the conference after being renovated, expanded and written in accordance with the rules of the magazine. The high standard of excellence for any of published papers will be ensured by peer-review procedure. The journal takes into consideration only original scientific papers.
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