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Improving environmental performance of a direct absorption parabolic trough collector by using hybrid nanofluids

机译：采用杂交纳米流体改善直接吸收抛物线收集器的环境性能

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摘要

This study deals with the influence of hybrid nanofluids i.e., a mixture of Al2O3 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 CO2 was calculated for the nanofluid-based collector. The results reveal that using hybrid nanofluids instead of water leads to reductions in CO2 emission and water consumption as much as 450.33 kg and 2016.6 m(3) per collector, respectively.
机译：该研究涉及杂交纳米流体中的影响，Al 2 O 3和多壁碳纳米管（MWCNT）的混合物，分散在水中，对直接吸收抛物线槽收集器的环境性能。为此目的，制备三种体积浓度的杂交纳米流体，即0.01％，0.02％和0.04％，并测量它们的光学性质。接下来，将纳米流体用于直接吸收抛物线槽收集器（DAPTC）作为传热流体（HTF），以测量使用杂交纳米流体对其能量和环境性能的影响。从光谱实验获得的数据显示，杂交纳米流体具有比单纳米流体和基础流体更好的光学性质，它将适用于DAPTC以增加热性能。使用具有0.04％的体积分数的杂化纳米流体随着传热流体将太阳能收集器的最高温差参数与水，0.04％氧化铝纳米流体和0.04％MWCNT纳米流体相比，太阳能收集器的最高温差参数增强了0.04％。分别。因此，通过使用杂交纳米流体，与使用水，氧化铝/水（0.04％）和MWCNT /水（0.04％）的情况相比，太阳能收集器的热效率改善了197.1％，69.2％和6.1％ ， 分别。对吸收管中的压降被造成，结果表明，由于低体积级分，杂交纳米流体的压降增加可以忽略不计。此外，针对纳米流体基收集器计算水的储存以及其他污染物排放等诸如CO 2的排放。结果表明，使用杂交纳米流体代替水导致每集收集器的450.33千克和2016.6 m（3）减少二氧化碳排放和耗水量。

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