Journal
CASE STUDIES IN THERMAL ENGINEERING
Volume 33, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.csite.2022.101957
Keywords
Evacuated tube solar collector; Hybrid nanofluid; Solar energy; Thermal efficiency; Energy; Exergy
Categories
Funding
- Centre for Renewable Energy (CRE) at The British University in Egypt
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In this study, the effect of using MgO/MWCNT hybrid nanofluid on the thermal performance of the evacuated tube solar collector was investigated. The results showed that increasing the weight ratios of MWCNTs nanoparticles and volume flow rate improved the energy and exergy efficiencies of the collector. Furthermore, MgO/MWCNT (50:50) hybrid nanofluid performed better than other hybrid nanofluids at all volume flow rates.
Utilizing a hybrid nanofluid is a promising solution for enhancing the thermal performance of the solar collector in a sustainable manner. In the present work, the effect of using magnesium oxide/ multi-walled carbon nanotubes (MgO/MWCNT) hybrid nanofluid on the thermal performance of the evacuated tube solar collector is experimentally investigated. Four different weight ratios of (80:20), (70:30), (60:40), and (50:50) are used for a hybrid of MgO with MWCNTs in a water base, respectively. The experiments are performed at a 0.02% particle concentration and at various volume flow rates ranging from 1 to 3 L/min. The results show an enhancement in the energy and exergy efficiencies with the increase in the weight ratios of MWCNTs nanoparticles and volume flow rate. The enhancement of the energy and exergy efficiencies of the collector is 55.83% and 77.14%, respectively, for MgO/MWCNT (50:50) hybrid nanofluid. It is found that increasing the weight ratio of MWCNTs nanoparticles from 20% to 30% achieves a significant increase in the collector efficiency enhancement compared to other hybrid nanofluids. The results conclude that MgO/MWCNT (50:50) performs better than all other hybrid nanofluids at all volume flow rates and is closer to MWCNT/water nanofluid.
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