Assessment of Thermohydraulic Performance and Entropy Generation in an Evacuated Tube Solar Collector Employing Pure Water and Nanofluids as Working Fluids

• DOI: 10.2139/ssrn.4632306
• Publication Date: 2023-11-14T07:08:51Z
• Authors: Oscar Alejandro ...; Fernando Lara; Alvaro Gonzalez-A...; Arilí Cárdenas-Ro...; José de Jesús Ram...; Jorge Arturo Alf...
• Keywords: Working fluid

This research aims to numerically compare the thermal behavior of three working fluids (pure water, TiO2, and SiO2 water-based nanofluids) in an evacuated tube solar collector. The comparison encompasses both thermohydraulic performance global local entropy generation utilizing Computational Fluid Dynamics. variation operating conditions such as radiation value inlet mass flow rate is considered. Under lowest value, nanofluids present higher values outlet temperature, velocity inside collector, efficiency, exergy efficiency. However, due negative impact on specific heat case most intense level, nanofluid presents efficiency fluids. Entropy analysis accounts for viscous effects, transfer loss. Utilizing TiO2 results a reduction (up 79%). Meanwhile, under using similar attributed loss pure water (4.7 W/K). investigation provides insights into collectors across range conditions.