THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

Numerical study of heat transfer in a flat plat thermal solar collector with partitions attached to its glazing

ABSTRACT
Heat transfer in the air gap of an horizontal flat plat thermal solar collector contain partitions attached to its glazing has been studied numerically. The absorber and the glazing are kept at constant and different temperatures, while the vertical walls (insulation) were kept adiabatically. A conjugate formulation was used for mathematical formulation of the problem and a computer program based on the control volume approach and the SIMPLER algorithm was used. The main aim of the current paper is to study numerically the effects of number of fins and their length on the air pattern and heat transfer. It was observed that the heat transfer rate through the air gap is affected greatly and hence can be controlled by the number of attached fins to the glazing of the solar collector as well as the fin lengths, and the addition of partitions reduces the heat losses by convection by 90%.
KEYWORDS
PAPER SUBMITTED: 2017-05-31
PAPER REVISED: 2018-01-25
PAPER ACCEPTED: 2018-03-12
PUBLISHED ONLINE: 2018-04-28
DOI REFERENCE: https://doi.org/10.2298/TSCI170531101L
REFERENCES
  1. Ahmed. M. S. Amraqui, and C. Abid, "Combined Natural Convection and Surface Radiation in Solar Collector Equipped with Partitions " Applied Solar Energy, vol. 47, pp. 36-47, 2011.
  2. T. W. Tong, F.M.Grener, "Natural convection in partitioned air-filled rectangular enclosure," Int, J. Heat and Mass Transfer, vol. 13, pp. 99-108, 1986.
  3. J. C. King, R. Narayanaswamy, "Radiative effects on natural convection heat transfer in enclosure with multiple partitions," Department of Mechanical Engineering Curtin University of Technology 1987.
  4. Samy- El-Sherbiny, "Natural convection in partitioned rectangular enclosures Air," Alexandria Engineering Journal, vol. 43, pp. 593-602, 2004.
  5. Bahlaoui and al, "Numerical study of mixed convection coupled with radiation in a vented partitioned enclosure," International Scientific Journal for alternative energy and ecology № 6 (62) 2008.
  6. J. F. Sacadura, "Initiation to the thermal transfers," 1980.
  7. D. Spalding, S. Patankar, "A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows," International Journal of heat and mass transfer, vol. 15, pp. 1787-1806, 1972.
  8. "Heat Transfer Fluent user guide (Chapter11).".
  9. Amraqui. S, "Modeling of thermal transfers paired in a thermal solar collector cells with anti-losses," doctorat thesis ,2009.
  10. G. De. Vahl. Davis, "Natural convection of air in a square cavity: a bench mark numerical solution," Int. J. for Numerical Methods in fluids, vol. 3, pp. 249-264, 1983.
  11. Ramon.L.Frederick, "Natural convection in an inclined square enclosurwith a partition attached to its cold wall," InI. J. Heat Mass Transfer, vol. 32, pp. 87-94, 1989.
  12. E. Bilgen, "Natural convection in cavities with a thin fin on the hot wall," InI. J. Heat Mass Transfer, vol. 48, pp. 3493-3505, 2005.
  13. H. Bouali, Mohammed Rabhi, Ahmed Mezrhab, "Radiation-natural convection heat transfer in inclinedrectangular enclosures with multiple partitions," Energy Conversion and Management, vol. 49, pp. 1228-1236, 2008.
  14. Paweena Khansila et al "numerical study of natural convection in porous square enclosure non-uniformly heated from the partitions," International Journal of Pure and Applied Mathematics, vol. 96. N 2, pp. 2013-228, 2014.
  15. Farah Zemani et al "effect of partial partitions on natural convection in air filled cubical enclosure with hot wavy surface," Chemical Engineering &Process Technology, vol. 5, 2014.
  16. T. Yousefi et al "modeling the free convection heat transfer in apartitioned cavity by the use of fuzzy logic," International Journal of Modeling and Optimization, vol. 1,N.4, 2011.
  17. Ahmet Koca et al "using of Bejan's heat line techniquefor analysis of natural convection in a divided cavity with differentially changing conductive partition," Numerical Heat Transfer, vol. 64, pp. 339-359, 2013.
  18. Jamal Hameed Wahebl et al "the natural convective heat transfer in rectangular enclosure containing two inclined partitions," AASCIT Journal of Energy, vol. 2(3), pp. 36-43, 2015.
  19. A. Haghighi and K. Vafai, "optimal positioning of strips for heat transfer reduction within an enclosure," Numerical Heat Transfer, vol. Part A, 66, pp. 17-40, 2014.
  20. Mehdi Khatamifara et al "conjugate natural convection heat transfer in a partitioneddifferentially-heated square cavity," International Communications in Heat and Mass Transfer, pp. 12, 2016.
  21. Osameh GHAZIANal, "experimental investigation of natural convection in an enclosure with partial partitionsat differents angles," THERMAL SCIENCE, vol. 18, N.4, pp. 1133-1144, 2014.