3D numerical modelling and experimental validation of an asphalt solar collector

A. Alonso-Estébanez, P. Pascual-Muñoz, J.L. Sampedro-García, D Castro-Fresno

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Abstract

Research about renewable technologies for thermal energy collection is crucial when critical problems such as climate change, global warming or environmental pollution are concerned. Transforming solar energy into thermal energy by means of asphalt solar collectors might help to reduce greenhouse gas emissions and fossil fuel consumption. In this paper, a laboratory-scale asphalt solar collector formed by different slabs has been characterized by applying numerical techniques. An experimental test where the thermal performance of the collector was determined for three values of heat exchange fluid flow rate was carried out for the validation of the numerical model. Then, the CFD model was used to analyse the thermal response of the collector according to the following parameters: flow rate, solar irradiance, size and thickness. Results show that increasing values of heat exchange fluid flow rate result in better thermal performances. Likewise, increasing values of irradiance and size of the collector lead to higher values of thermal performance, although other parameters should also be considered for the final design of the system. Finally, under the conditions here considered, the thickness of the collector turned out not to be as significant as expected in relation to its thermal response. The combination of experimental tests and CFD codes can be considered a powerful tool for the characterization of asphalt solar collectors without incurring significant costs related to experimental field tests.

Original languageEnglish
Pages (from-to)678-688
Number of pages11
JournalApplied Thermal Engineering
Volume126
Early online date19 Jul 2017
DOIs
Publication statusPublished - 5 Nov 2017
Externally publishedYes

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Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Applied Thermal Engineering,. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Thermal Engineering, 126, (2017) DOI: 10.1016/j.applthermaleng.2017.07.127

© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Numerical analysis
  • CFD
  • Asphalt collector
  • Solar energy collection
  • Thermal performance

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