The performances of three types of solar collectors using various nanofluids are theoretically investigated; further, by varying the concentration of binary nanofluids comprising of two highly efficient nanofluids, the performances of the solar collectors are analytically examined. The results obtained demonstrate that MWCNT, CuO, and Fe₃O₄ nanofluids show a higher efficiency compared with other nanofluids. Both MWCNT/CuO and MWCNT/Fe₃O₄ binary nanofluids provide efficiency enhancements in the range 2–50 %, 3–7 %, and 2–4 %, respectively, in flat plate, vacuum U-tube, and heat pipe solar collectors, compared with a 0.05 vol% MWCNT nanofluid. The use of binary nanofluids enhances the efficiency of solar collectors, which further increases with the concentration of the binary nanofluids. Furthermore, when the MWCNT/CuO binary nanofluid shows a higher efficiency than the MWCNT/Fe₃O₄ binary nanofluid in three solar collectors.

理论上研究了使用各种纳米流体的三种类型的太阳能收集器的性能。此外，通过改变由两种高效纳米流体组成的二元纳米流体的浓度，可以分析性地检查太阳能收集器的性能。获得的结果表明，与其他纳米流体相比，MWCNT，CuO和Fe ₃ O ₄纳米流体显示出更高的效率。MWCNT / CuO和MWCNT / Fe ₃ O ₄与0.05vol％的MWCNT纳米流体相比，二元纳米流体在平板，真空U型管和热管太阳能集热器中的效率分别提高了2％至50％，3％至7％和2-4％。二元纳米流体的使用提高了太阳能收集器的效率，其随着二元纳米流体的浓度而进一步提高。此外，当在三个太阳能收集器中MWCNT / CuO二元纳米流体显示出比MWCNT / Fe ₃ O ₄二元纳米流体更高的效率时。