油基CuO和HgS纳米流体的光热转换特性研究

PHOTOTHERMAL CONVERSION PROPERTIES OF OIL-BASED CuO AND HgS NANOFLUIDS

以氙灯作为模拟太阳光源,实验研究CuO和HgS纳米流体的光热转换特性。与透明导热油相比,浓度为0.1 mg/m L的CuO纳米流体和浓度为1.0 mg/m L的HgS纳米流体的光热转换效率可分别提升35%和27%。随着浓度的增大,由于表面效应,CuO纳米流体的温升出现饱和现象,而HgS纳米流体则未出现类似现象。分析表明:对于CuO和HgS纳米流体而言,光热转换效率的提高分别是由于纳米颗粒的吸收和散射2种效应所导致的。该研究揭示出具有不同光谱吸收特性的纳米流体其提高光热转换效率的机制有所不同,有助于在太阳能光热转换应用中纳米流体的合理选择。

The photothermal conversion properties of oil-based CuO and HgS nanofluids were experimentally investigated using xeon lamp as simulating solar radiation source. Compared with pure transparent heat conduction oil, the conversion efficiency improvements of CuO nanofluid at 0.1 mg/mL concentration and HgS nanofluid at 1.0 mg/mL reached 35% and 27%, respectively. With the increase of concentration, the temperature rise of CuO nanofluid showed a saturation effect because of the surface effect. However, no similar effect was shown for HgS nanofluid. The analyses show that the improvement of photothermal conversion efficiency is contributed by absorption effect of CuO nanofluid and by the scattering effect of HgS nanofluid, respectively. The research shows that for nanoluids with different spectral absorption characteristics, the improvement mechanism of photothermal conversion efficiency is different. This is helpful to reasonable selection of nanofluids in the application of solar photothermal conversion.