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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

HEAT AND RADIATIVE TRANSFER OF NANOFLUID-BASED SOLAR THERMAL COLLECTOR

Get access (open in a dialog) DOI: 10.1615/IHTC16.nmt.021742
pages 7131-7136

Abstract

The excitation of localized surface plasmon at the metal nanoparticles can significantly enhance the absorption of solar energy. However, the absorption peak is sharp at the resonant frequency. To achieve a broadband absorption, the blended nanofluid formed by SiO2/Ag nanoshells of different core size and shell thickness is employed. The blended nanofluid has a good solar absorption property, whose extinction spectrum matches the solar spectrum well. The photothermal performance of the solar thermal collector is related to many factors, including the geometric parameters and operation conditions of the solar collector, and the optical and thermophysical properties of nanofluid. As the flow velocity increases, the outlet temperature and collector efficiency have the opposite trends. In order to obtain a large outlet temperature at high velocity, it can be considered to elongate the channel length. But, it makes a negative effect on the collector efficiency. For collector of a small height, there is a great difference in the outlet temperature of different nanofluids. Due to the strong extinction properties of the blended nanofluid, the volume fraction is only 1/10 of that of Ag nanofluid for an equal temperature increases.