颗粒浓度对含纳米氧化铝石蜡光热特性的影响

Effect of Particle Concentration on Photothermal Characteristics of Nano-alumina Containing Paraffin

为实现直接吸收式太阳能集热器的高效利用,以集热器内置含纳米氧化铝石蜡基体为研究对象,以提升基体的光热性能为目标,研究了颗粒浓度对含纳米颗粒石蜡导热流体的温变特性与透光性能的影响。通过模拟太阳辐射,测量含不同浓度纳米颗粒石蜡流体的温变特性,结果发现随着氧化铝纳米颗粒浓度的增大,石蜡升温时间变短,升温速度逐渐加快;测量含纳米氧化铝颗粒石蜡流体透光率,结果发现当纳米氧化铝颗粒浓度低于1%vol时,对透光率影响显著,并随着颗粒浓度的增大,透光率降低。

In order to realize the high-efficiency utilization of direct absorption solar collectors,the nano-alumina paraffin matrix with built-in collector is taken as the research object,aiming at improving the photothermal performance of the substrate,the effect of particle concentration on the temperaturedependent properties and light transmission properties of nano-particle paraffin heat conducting fluid was studied.By simulating the solar radiation,the temperature change characteristics of paraffin fluids containing nano-particles with different concentrations were measured.It was found that with the increase of the concentration of alumina nanoparticles,the heating time of paraffin was shortened,and the heating speed was gradually accelerated.The results show that when the concentration of nano-alumina particles fluid is less than 1%vol,it has a significant effect on the light transmittance,and with the increase of particle concentration,the light transmittance decreased.