文章基本信息

标题：Improve the performance of a solar air heater by adding aluminum chip, paraffin wax, and nano-SiC
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作者：Qusay A. Jawad ; Aedah M.J. Mahdy ; Ahmed H. Khuder 等
期刊名称：Case Studies in Thermal Engineering
印刷版ISSN：2214-157X
电子版ISSN：2214-157X
出版年度：2020
卷号：19
页码：1-9
DOI：10.1016/j.csite.2020.100622
出版社：Elsevier B.V.
摘要：In this study, a solar air heater was proposed to suit the atmosphere of the city of Baghdad in winter. In this heater, aluminum chip and tubes filled with nano-silicon carbide (SiC) added to paraffin wax to improve its thermophysical properties were used. The density and viscosity of nano-SiC + paraffin were subjected to limited change because of the added nanoparticles. The product's thermal conductivity increased by 18.2% by adding 3 wt% of nano-SiC. The heat capacity of the composite material decreased by 4.5% and their effect on the solar air heater performance was limited. Practical outdoor tests have proven the suitability of the proposed air heater to work in the weather conditions of Baghdad. The use of the chips improved the heater performance and accelerated the air to heat up so that the warming load on the composite material tubes was decreased at morning hours. The tested air heater temperatures reached high degrees and continued to work for at least 3 h after sunset, despite the heater limited measurements compared to air heater without chip and nano-SiC-paraffin..
关键词：Solar air heater ; Nano;SiC ; Paraffin ; Melting and solidification points ; Aluminum chip