MWCNT-H2O纳米流体光热特性实验研究

摘要

研究了MWCNT-H2O纳米流体的光学及光热特性，利用紫外-可见-近红外分光光度计结合积分球原理测试了不同质量分数的纳米流体在太阳能全波段（250 nm<λ<2500 nm）的透射率。利用太阳辐射对纳米流体的光热转换特性进行了测试。实验结果表明：纳米流体的透射率明显低于水的，并且纳米流体的透射率随着粒子质量分数的增加而降低。纳米流体（质量分数为0.02%）的最高温度比水提高了31.87%，集热量比水增加了54.14%。MWCNT-H2O纳米流体有望用在直接吸收式太阳能集热系统中。%Optical and photothermal properties of MWCNT-H2O nanofluids were investigated in the present work. The transmittance of nanofluids over solar spectrum (250 to 2 500 nm) was measured by the UV-Vis-NIR spectrophotometer based on the integrating sphere principle. The photothermal properties of nanofluids were studied with exposure to the solar radiation. The experimental results show that the transmittance of MWCNT-H2O nanofluids is much less than that of deionized water, and decreases with increasing nanoparticle mass fraction. The highest temperature and heat gain of MWCNT-H2O nanofluids (the mass fraction is 0.02%) can increased up to 31.87%and 54.14%compared with deion-ized water, respectively. From the results it can be concluded that MWCNT-H2O nanofluids are suitable for direct ab-sorption solar thermal energy systems.