Experimental investigation of thermal radiative properties of Al2O3-paraffin nanofluid


WANG Q., WEI W., Lİ D., QI H., WANG F., ARICI M.

SOLAR ENERGY, vol.177, pp.420-426, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 177
  • Publication Date: 2019
  • Doi Number: 10.1016/j.solener.2018.11.034
  • Title of Journal : SOLAR ENERGY
  • Page Numbers: pp.420-426
  • Keywords: Thermal radiative properties, Al2O3-paraffin nanofluid, Absorption coefficient, Reflectivity, DIRECT ABSORPTION, OPTICAL-PROPERTIES, PCM, CONDUCTIVITY, TEMPERATURE, PERFORMANCE, CONSTANTS, BEHAVIOR, STORAGE

Abstract

The thermal radiative properties of nanofluids have considerable contribution to the effectiveness of harvesting solar energy. In this work, the thermal radiative properties of Al2O3-paraffin nanofluid were experimentally investigated in terms of the influence of volume concentration, nanoparticle size, temperature and optical path. The transmittance spectrums of Al2O3-paraffin nanofluid were measured by a TU-19 FTIR spectrometer which was used for the calculation for the absorption coefficient and reflectivity of nanofluid. The experimental results show that Al2O3-paraffin nanofluid performs excellent ability to absorb solar energy compared to pure paraffin, with higher absorption coefficients increased up to 15.5 times at volume concentration 0.01%. The reflectivity of nanofluid is sensitive to nanoparticle size. When the nanoparticle size decreases from 30 to 10 nm the reflectivity of Al2O3-paraffin nanofluid reduces about 37.04%. With increasing temperature, the absorption coefficient of Al2O3-paraffin nanofluid increases and the reflectivity accordingly decreases.