APPLICABILITY OF RADIATION ABSORBING AND NON-ABSORBING NANOPARTICLES IN PHOTOTHERMAL ENERGY CONVERSION: A COMPARATIVE STUDY

Year 2017, , 388 - 396, 30.06.2017

Layth-Al Gebory

https://doi.org/10.17261/Pressacademia.2017.615

Abstract

The
radiative properties of nano-sized particles play a significant role in a
widely range of industrial and engineering applications, such as chemical,
electric power, industry, meteorology, biomedicine, biophysics, astronomy,
combustion, fire and flame, as well as solar power plants. In the thermal
applications field, nanoparticles are found to be an effective electromagnetic
wave absorbers within UV–Visible wavelength range; where, short wavelength
radiations include high energy photons. Because of their excellent and unique
thermo-optical properties which are the basis of thermal phenomena and energy
conversion, nanoparticles are used as working media in solar thermal collectors
for photo-thermal energy conversion. The purpose of the present study is to investigate
the applicability of absorbing (conducting) and non-absorbing (dielectric)
nanoparticles in photo-thermal energy conversion. These particles are dispersed
in a media to produce nanoparticle suspensions. The comparison between the
radiative properties of the two nanoparticles with their suspensions is carried
out. The radiative properties include scattering, absorption as well as
extinction coefficients which are the most important parameters in the capture
and utilization of solar energy. The contribution of particle scattering in the
radiation attenuation is investigated by computing the single scattering
albedo. Through the analysis of the radiative and thermal behaviour of the
particulate medium, it is clear that photothermal conversion is important to
not only the solar thermal systems, but also to the electricity generation and
solar chemical technology, in addition to the other applications. 

Keywords

Nanoparticles, radiative properties, photo-thermal conversion

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