Numerical analysis of evacuated tube solar collectors using nanofluids
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Date
2019
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Abstract
In this study, numerical analysis of water and water based nanofluids in ETSCs were made by using CFD. Validation of the study was made by comparing an experimental and two different numerical results. Thanks to the analyzes, the effects of water based Al2O3–H2O and CuO–H2O nanofluids compared to water on heat transfer for different volume fractions of nanoparticle, different collector angles, different mass flow rates and different numbers of evacuated tubes were examined. According to these parameters, the thermal and hydraulic statuses of the collector were examined by using the Boussinesq approximation and the tank outlet temperatures were determined. It has been determined that the use of nanofluid in ETSC systems has improved heat transfer and the best improvement was obtained with CuO–H2O nanofluid. © 2019 International Solar Energy Society
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Keywords
Alumina , Aluminum oxide , Computational fluid dynamics , Copper oxides , Heat transfer , Numerical analysis , Solar collectors , Boussinesq approximations , Different mass , Evacuated tube solar collector , Evacuated tubes , Nanofluids , Numerical results , Outlet temperature , Water based , heat transfer , numerical model , solar power , water , Nanofluidics