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Carbon-nanohorn based nanofluids for a direct absorption solar collector for civil application

  Articoli su Riviste JCR/ISI  (anno 2015)

Autori:  Moradi A., Sani E., Simonetti M., Francini F., Chiavazzo E., Asinari P

Affiliazione Autori:  Energy Department, Politecnico Di Torino, Corso Duca Degli Abruzzi 24 10129, Torino, Italy National Institute of Optics, National Research Council (CNR-INO), Largo E. Fermi 6, 50125, Firenze, Italy

Riassunto:  Direct solar absorption has been often considered in the past as a possible solution for solar thermal collectors for residential and small commercial applications. A direct absorption could indeed improve the performance of solar collectors by skipping one step of the heat transfer mechanism in standard devices and having a more convenient temperature distribution inside the collector. Classical solar thermal collectors have a metal sheet as absorber, designed such that water has the minimum temperature in each transversal section, in order to collect as much solar thermal energy as possible. On the other hand, in a direct configuration, the hottest part of the system is the operating fluid and this allows to have a more efficient conversion. Nanofluids, i.e., fluids with a suspension of nanoparticles, such as carbon nanohorns, could be a good and innovative family of absorbing fluids owing to their higher absorption coefficient compared to the base fluid and stability under moderate temperature gradients. Moreover, carbon nanohorns offer the remarkable advantage of a reduced toxicity over other carbon nanoparticles. In this work, a three-dimensional model of the absorption phenomena in nanofluids within a cylindrical tube is coupled with a computational fluid dynamics (CFD) analysis of the flow and temperature field. Measured optical properties of nanofluids at different concentrations have been implemented in the model. Heat losses due to conduction, convection and radiation at the boundaries are considered as well.

Volume n.:  15 (5)      Pagine da: 3488  a: 3495
Ulteriori informazioni:  Authors thank Dr. Simona Barison, Dr. Cesare Pagura and Dr. Filippo Agresti for preparing nanofluids; Mr. Massimo D'Uva and Mr. Mauro Pucci for technical assistance. P. Asinari and E. Chiavazzo acknowledge the support of the Italian Ministry of Research (FIRE grant RBFR10VZUG, THERMALSKIN project,
DOI: 10.1166/jnn.2015.9837

*Impact Factor della Rivista: (2015) 1.338   *Citazioni: 28
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  14/07/2019

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