太阳能集热用导热油纳米流体的稳定性及中温集热特性

Experimental Study on the Dispersion Stability and Solar Heat Collection Performance of Oil-based Nanofluids

提出将纳米颗粒分散于导热油基液形成一种具有强的光吸收性能的纳米流体,能够直接在无吸收涂层的透明真空管内吸收太阳能进行光热转换,用于太阳能中温集热。首先探讨了导热油-Cu O纳米流体稳定性的影响因素,获得了制备过程中最佳的改性油酸量为2.3 m L/1g Cu O。在室外聚光工况下,实验测试了导热油-Cu O纳米流体在无涂层的透明真空管内直接吸收式中温集热特性,并与镀膜真空管集热性能进行了试验对比。结果显示,在150℃以下集热工况,纳米流体在该透明集热管的集热效率要高于传统吸收镀膜集热管,验证了该新型中温集热方法的可行性。

A novel solar medium-temperature heat collection method was proposed,using nanofluid with strong solar light ab-sorption properties as working fluid.Nanofluids filled in transparent vacuum absorbing tubes without coating for absorbing solar ra-diation.The dispersion stabilities of the oil-based CuO nanofluids were experimentally analyzed,and the optimum added volume of surfactant was obtained.Furthermore,performances of solar concentrating collection using oil-based CuO nanofluid was experimen-tally investigated,compared with a commonly used vacuum tube with solar selective coatings.Results show using nanofluid in transparent tubes achieves a higher efficiency than that of vacuum tube with film coating within 150℃conditions.