为开发高性能的直接吸收式太阳能集热器的集热工质,制备以尿素/氯化胆碱组成的低共熔溶剂（DES）为基液,并添加碳纳米管（MWCNT）的纳米流体,结果表明MWCNT-DES纳米流体具有优良的稳定性,在15 d内未出现明显的沉降现象。此外,纳米流体质量浓度越大,其热导率和黏度也越大。对不同种类基液的太阳能光热转换性能展开探究,结果表明与水相比,DES作为基液的纳米流体太阳能光热转换性能更优异。添加MWCNT纳米颗粒可有效提高纳米流体的太阳能光热转换效率。当太阳辐照度为1000 W/m2,浓度为0.007% MWCNT-DES纳米流体的太阳能光热转换效率为61.82%,比DES的太阳能光热转换效率提高95%。
Abstract
In order to develop high performance heat collecting fluids for direct absorption solar collectors, nanofluids filled with carbon nanotubes （MWCNT） was prepared using urea/choline chloride composed of a deep eutectic solvent （DES） as a base solution. The results show that MWCNT-DES nanofluids has excellent stability and no obvious settlement in 15 days. In addition, the higher the mass concentration, the greater the thermal conductivity and viscosity of the MWCNT-DES nanofluids. The solar photothermal conversion performance of different types of base fluids was explored, and it is found that compared with water, DES have better solar photothermal conversion performance as a base fluid nanofluids. The addition of MWCNT nanoparticles can effectively improve the solar photothermal conversion efficiency of nanofluids. When the irradiation intensity is 1000 W/m2 and the concentration is 0.007%, the solar photothermal conversion efficiency of MWCNT-DES nanofluids is 61.82%, which is 95% higher than that of DES-based liquid.
关键词
太阳能 /
碳纳米管 /
稳定性 /
纳米流体 /
光热转换
Key words
solar energy /
carbon nanotubes /
stability /
nanofluids /
photothermal conversion
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基金
区域联合基金-粤港澳研究团队项目（2021B1515130008）; 广东省科学技术局重点研发计划（2023B03J1283）
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