International Scientific Journal


This paper deals with the numerical simulation of air around the arrays of flat plate collectors and determination of the flow field, which should provide a basis for estimating a convective heat losses, a parameter which influences their working characteristics. Heat losses are the result of the reflection on the glass, conductive losses at the collector’s absorber plate, radiation of the absorber plate and convective losses on the glass. Wind velocity in the vicinity of the absorber plate depends on its position in the arrays of collectors. Results obtained in the numerical simulation of flow around collectors were used as boundary conditions in modeling of thermal-hydraulic processes inside the solar collector. A method for coupling thermal-hydraulic processes inside the collector with heat transfer from plate to tube bundle was developed, in order to find out the distribution of the temperature of the absorber plate and the efficiency of the flat plate collectors. Analyses of flow around arrays of collectors are preformed with RNG k - ε model. Three values for free-stream velocity were analysed, i.e. 1 m/s, 5 m/s and 10 m/s, as well as two values for the angle between the ground and the collector (20° and 40°). Heat transfer coefficient was determined from the theory of boundary layer. Heat transfer inside the plate cavity was analyzed assuming constant intensity of radiation.
PAPER REVISED: 2011-04-22
PAPER ACCEPTED: 2011-05-12
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2011, VOLUME 15, ISSUE Issue 2, PAGES [457 - 465]
  1. Naeen N., Yagnoub M.: Analysis of wind flow around a parabolic collector (1) fluid flow, Renewable Energy, (2007), 32, pp. 1898-1916
  2. Kung-Ming Chung, Keh-ChinChang, Chin-ChengChou, Wind loads on residential and large-scale solar collector models, Journal of Wind Engineering and Industria l Aerodynamics, (2011), 99, pp. 59-64
  3. Jianhua Fan, Louise Jivan Shah and Simon Furbo, Flow distribution in a solar collector panel with horizontally inclined absorber strips, Solar Energy, (2007), 81, pp 1501-1511
  4. Yakhot, V., Orszag, S.A.: Renormalization group analysis of turbulence, Journal of Scientific Computation, (1986), 1, pp. 3-51
  5. Saha, A.K., Biswas G., Muralidhar K.: Numerical study of the turbulent unsteady wake behind a partially enclosed square cylinder using RAANS, International Journal of Computational Method in Applied Mechanical Engineeering, (1999), 178, pp. 323-341
  6. Sakar, T., Sayer, P.G., Fraser, S.M.: Flow simulation past axisymmetric bodies using four different turbulence models, International Journal of Applied Mathematics Model, (1997), 21, pp. 783-792
  7. Yaghoubi M., Velayati E.: Undeveloped convective heat transfer from an array of cubes in cross-stream direction, International Journal of Thermal Science, (2005), 44, pp. 756-765
  8. Lambić M.: Solarni uređaji, Tehnička knjiga, Beograd, 1987
  9. J. A. Duffie, W. A. Beckman: Solar Engineering of Thermal Processes, John Wiley & Sons, Inc, , USA, 2006

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence