International Scientific Journal


Study of rate of heat transfer in a flat-plate solar collector is the main subject of this paper. Measurements of collector and working fluid temperatures were carried out for one year covering the harmattan and rainy seasons in Port Harcourt, Nigeria, which is situated at the latitude of 4.858oN and longitude of 8.372oE. Energy balance equations for heat exchanger were employed to develop a mathematical model which relates the working fluid temperature with the vital collector geometric and physical design parameters. The exit fluid temperature was used to compute the rate of heat transfer to the working fluid and the efficiency of the transfer. The optimum fluid temperatures obtained for the harmattan, rainy and yearly (or combined) seasons were: 317.4, 314.9 and 316.2 [K], respectively. The corresponding insolation utilized were: 83.23, 76.61 and 79.92 [W/m2], respectively, with the corresponding mean collector efficiency of 0.190, 0.205 and 0.197 [-], respectively. The working fluid flowrate, the collector length and the range of time that gave rise to maximum results were: 0.0093 [kg/s], 2.0 [m] and 12PM - 13.00PM, respectively. There was good agreement between the computed and the measured working fluid temperatures. The results obtained are useful for the optimal design of the solar collector and its operations.
PAPER REVISED: 2010-06-30
PAPER ACCEPTED: 2010-08-04
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THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Issue 2, PAGES [583 - 591]
  1. Mohseni-Languri, E. Taherian, H., Mosoodi, R. and Reisel, J.R., An exergy and heat study of a solar thermal air collector, Thermal Science, Vol. 13, pp. 205 - 216, 2009
  2. Duffie, J.A. and Beckman, W.A., Solar heat thermal processes, John Wiley and Sons Inc., New York, 1974
  3. Howell, J.R, Bannerot, R.B. and Vliet, G.C., Solar-thermal energy systems, McGraw-Hill, New York, pp.122 - 158, 1982
  4. Kuye, A., Oko, C.O.C. and Nnamchi, S.N., Simulation of the drying characteristics of ground neem seeds in a fluidised bed. J. of Eng. and Tech. , vol. 2, no. 1, pp. 21 - 31, 2007
  5. Pavlov, K.F., Romankov, P.G. and Noskov, A.A., Examples and problems to the course of unit operations of chemical Engineering, 1st ed., Mir Publishers, Moscow,1979
  6. Stoecker, W.F., Design of thermal systems, 3rd. ed., McGraw-Hill, New York, 1989
  7. Kreith, F., Principles of heat transfer, 3rd ed., IEP-Dun-Donnelley Harper & Row Publishers, New York, 1973
  8. Soponronnarit, S., Solar drying in Thailand, Heat for sustainable development, vol. 11, no. 2, pp. 19 - 25, 1995
  9. Oko, C.O.C., Introduction to heat transfer: an algorithmic approach, Pam Unique Publishing Coy., Port Harcourt, 2005
  10. Zamfir, E., Oancea, C., Binder, C. and Radulescu, I., Simple and accurate method to evaluate the tie-averaged performance of flat-plate solar collectors, Heat Sources, vol. 18, pp. 685 - 710, 1996
  11. Ezekoye, B.A. and Enebe, O.M., Development and performance evaluation of modified integrated passive solar grain dryer, The Pacific Journal of Science and Technology, vol. 7, no. 2, pp.185 - 190, 2006
  12. Biondi, P., Licala, L. and Farina, G., Performance analysis of solar air heaters of conventional design, Solar Heat, vol. 41, no. 1, pp. 101 - 107, 1988
  13. Khattab, N.M., Optimization of hybrid solar dryer, Heat Sources, vol. 18, pp. 781 - 790,1996
  14. Ideriah, F.J.K. and Suleman, S.O, Sky condition at Ibadan during 1975 - 1980, Solar Energy, vol. 43, no. 6, pp. 325 - 330,1989
  15. Qui, G. and Riffat, S.B., Optimum tilt angle of solar collectors and its impact on performance. International Journal of Ambient Energy, vol. 24, pp. 13 - 20, 2003
  16. Sodha, M.S., Bansal, N.K., Kumar, A., Bansal, P.K. and Milik, M.A., Solar crop drying, vol. I & II, CPR press, Boca Raton, Florida, USA, 1987.
  17. Welty, J.R., Wicks C.E. and Wilson, R.E. (1976). Fundamentals of Momentum, Heat, and Mass Transfer. 2nd ed., John Wiley & Sons, New York.

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