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Carbon nanotube nanofluid in enhancing the efficiency of evacuated tube solar collector
Renewable Energy ( IF 8.7 ) Pub Date : 2018-06-01 , DOI: 10.1016/j.renene.2018.01.006
I.M. Mahbubul , Mohammed Mumtaz A. Khan , Nasiru I. Ibrahim , Hafiz Muhammad Ali , Fahad A. Al-Sulaiman , R. Saidur

The use of solar thermal collectors is one of the promising options for heating and/or cooling due to the green nature (pollution free) and abundance of the solar energy in many parts of the world. Improvement of thermal performance of solar collectors is important for better energy conversion. In this regard, many studies reported in literature tried to modify geometry of the collectors. On the other hand, nanofluids as heat transfer fluids could be a promising option for the efficiency enhancement of solar collectors. In this study, heating performance of an evacuated tube solar collector system initially operated with water is considered for improvement using nanofluid. The collector (about 20 kW heating capacity) is a part of an absorption cooling system. The aim of the present study is to analyze the effect of Single Walled Carbon Nanotube–water nanofluid on the collector performance. Thermal efficiency improvement is assessed based on comparative analyses between collector working with ordinary water and that with nanofluid. The results indicate that up to 56.7% and 66% of efficiencies are observed when the collector is operated with water and 0.2 vol% nanofluid, respectively. Therefore, nanofluids are promising to enhance the efficiencies of solar collectors.

中文翻译:

碳纳米管纳米流体提高真空管太阳能集热器效率

由于世界许多地方的绿色自然(无污染)和丰富的太阳能,太阳能集热器的使用是加热和/或冷却的有前途的选择之一。提高太阳能集热器的热性能对于更好的能量转换很重要。在这方面,文献中报道的许多研究试图修改收集器的几何形状。另一方面,纳米流体作为传热流体可能是提高太阳能集热器效率的一个有前途的选择。在这项研究中,考虑使用纳米流体改进最初用水运行的真空管太阳能集热器系统的加热性能。集热器(约 20 kW 加热能力)是吸收式冷却系统的一部分。本研究的目的是分析单壁碳纳米管-水纳米流体对集热器性能的影响。基于使用普通水和纳米流体工作的集热器之间的比较分析来评估热效率的提高。结果表明,当收集器分别用水和 0.2 vol% 纳米流体操作时,观察到高达 56.7% 和 66% 的效率。因此,纳米流体有望提高太阳能集热器的效率。
更新日期:2018-06-01
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