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• W3179677315 endingPage "114450" @default.
• W3179677315 startingPage "114450" @default.
• W3179677315 abstract "• A hybrid nanofluid, Al 2 O 3 -MWCNT/water, in different concentrations was prepared. • The optical properties of prepared nanofluids and hybrid nanofluids were measured. • The hybrid nanofluids were applied in solar collector as volumetric absorber. • The thermal efficiency, embodied energy and water were analyzed. • Contaminants emission such as CO 2 was calculated while nanofluid was used. This study deals with the influence of hybrid nanofluids i.e., a mixture of Al 2 O 3 and Multi-wall carbon nanotubes (MWCNTs) dispersed in water, on the environmental performance of a direct absorption parabolic trough collector. For this purpose, hybrid nanofluids in three volume concentrations i.e., 0.01%, 0.02%, and 0.04% were prepared and their optical properties were measured. Next, the nanofluids were used in the direct absorption parabolic trough collector (DAPTC) as a heat transfer fluid (HTF) to measure the effect of using hybrid nanofluids on its energy and environmental performances. Obtained data from the spectrometric experiment reveal that hybrid nanofluids have better optical properties than mono nanofluids and the base fluid, it would be suitable for use in the DAPTC in order to increasing the thermal performance. Using hybrid nanofluids with a volume fraction of 0.04% as the heat transfer fluid intensifies the maximum temperature difference parameter of the solar collector at 240.7%, 57.2%, and 8.2% compared to water, 0.04% alumina nanofluids, and 0.04% MWCNT nanofluids, respectively. Consequently, by using hybrid nanofluids, the thermal efficiency of the solar collector ameliorates by 197.1%, 69.2%, and 6.1% compared with cases in which water, alumina/water (0.04%), and MWCNT/water (0.04%) are used, respectively. The pressure drop in the absorber tube was gaged, and the results show that the increment of pressure drop for hybrid nanofluids can be negligible due to low volume fraction. Moreover, the saving of water along with other contaminants emissions such as CO 2 was calculated for the nanofluid-based collector. The results reveal that using hybrid nanofluids instead of water leads to reductions in CO 2 emission and water consumption as much as 450.33 kg and 2016.6 m 3 per collector, respectively." @default.
• W3179677315 created "2021-07-19" @default.
• W3179677315 creator A5066080219 @default.
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• W3179677315 date "2021-09-01" @default.
• W3179677315 modified "2023-10-17" @default.
• W3179677315 title "Improving environmental performance of a direct absorption parabolic trough collector by using hybrid nanofluids" @default.
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• W3179677315 doi "https://doi.org/10.1016/j.enconman.2021.114450" @default.
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