Document Type : Original Article


1 Department of Mechanical Engineering, University of Lagos, Lagos State, Nigeria.

2 Department of Biomedical Engineering, University of Lagos, Lagos State, Nigeria.


Forced convection solar dryer has been widely used for effective drying of agricultural products because it permits better ventilation which makes it less dependent on weather conditions and removes moisture faster, hence preventing stagnation. Though the solar dryer has proved its usefulness, its major obstacle in its applications is the optimization of its performance. For the future sustenance of the solar dryers, the design, development, and optimization must depend on thorough theoretical tools. Hence, the current study presents the finite element analysis simulation of forced convective heat transfer in a photo voltaic-powered solar dryer. For performance optimization in the solar dryer analysis, the effects of the following factors such as blower speeds, the chamber ratio of the solar dryer, on the pressure and temperature distributions as well as the velocity in the drying chamber were investigated. From the results, the performance of the drying chamber increases as its aspect ratio decreases and as the blower speed increases. The results of this work could therefore be used in the design of an optimized Photovoltaic-ventilated forced convection solar dryer.


[1] Adelaja, A. O., Ogunmola, B. Y and Akolade, P. O. 2009: “Development of a Photovoltaic powered Forced Convection Solar Dryer”, Advanced Materials Research, Vol. 62-64, pp. 543-548.
[2] Ahmet, K. A., Orhan A. A. 2006. Ibrahim Dincer Numerical modeling of heat and mass transfer during forced convection drying of rectangular moist objects International Journal of Heat and Mass Transfer Vol. 49  3094–3103
[3] Aversa, M., Curcio,  S., Calabro, V.,  Dorio, G. 2007. An analysis of the transport phenomena occurring during food drying process. Journal of Food Engineering, Vol. 78(3), pp 922-932.
[4] Babuska, B. 1973. "The finite element method with Lagrangian multipliers," Numer. Math., Vol.. 20, pp. 179-192.
[5] Bala, B. K. and Woods, J. L., 1994. Simulation of the Indirect Natural Convection Solar Drying of Rough Rice, Solar Energy Vol. 53(3), 259-266.
[6] Bala, B. K. and Woods, J. L., 1995. Optimization of a Natural Convection Solar Drying System, Energy, Vol. 20(4), 285-294.
[7] Bala, B. K., Hossain, M. D. and Mondol, M. R. A. 1997. Photovoltaic Based Forced Convection Solar Tunnel Dryer for Pineapple, Journal of Agricultural Engineering, Vol. 32(4), 23-31.
[8] Bolaji, B. O and Olalusi, A. P. 2008: “Performance Evaluation of a Mixed-Mode Solar Dryer”, AU. J. T., Vol. 11, no. 4, pp. 225-231.
[9] Brezzi, F.  1974. "On the existence, uniqueness and approximation of saddle-point problems arising from Lagrangian multipliers." RAIRO Ser. Rouge, v. 8., pp. 129-151.
[10] Gan, A.  and Choo K.T. 2000. Thermal performance ofa solar dryer-simulation case study, 134–152.
[11] Janjai, S., Keawprasert, T., Chaicheet, C. Intawee, P., Bala, B. K. and Muhlbaner, W. 2004: “Simulation Model of a PV-Ventilated System for a Solar Dryer”, Technical Digest of the International PV SEC-14, Bangkok, Thailand, pp 861-862.
[12] Kaya, A. Aydin, C., Dincer., I. 2006. Numerical modelling of heat and mass transfer during forced convection drying of rectangular moist objects. Journal of Heat and MassTransfer; Vol. 49(17):3094-4103.
[13] Lewis, R.W., Nithiarasu P. and SeetharamuK.N. 2004.  Fundamental of the Finite Element Method for Heat and Fluid Flow John Wiley and Sons.
[14] Mumba, J. 1995: “Development of a Photovoltaic Powered Forced Circulation Grain Dryer Used in the Tropics”, Renewable Energy, Vol. 6, no. 7, pp. 885-862.
[15] Murugesan, K., Seetharamu, K. N, Narayana, P. A. 1996.  A one dimensional analysis of convective drying of porous materials. Journal of Heat and Mass Transfer ;Vol. 32(1):81e8.
[16] Oosthuizen, P. H. 1995 The Design of Indirect Solar Rice Dryers, Journal of Engineering for International Development, Vol. 2(1), 20-27.
[17] Reddy T. A.,  Pushparaj D. and Gupta C. L. 1979 ‘A Design Procedure for Convective Solar Dryers’ Cong Solaire International, Nice.
[18] Ruslan, M. H., Othman, M., Yatim B., Sopianand K., Ibarahim Z., 2002.  Performance of V-groove forceconvective solar drying system, Asian-Oceania Conference.
[19] Salah, A., Eltief, M. H., Ruslan, B. Y. 2007. Drying chamber performance of v-groove forced convective solar dryer desalination Vol. 209, 151–155.
[20] Simate, I. N.,  2003 Optimization of Mixed Mode and Indirect Mode Natural Convection Solar Dryers, Renewable Energy. Vol. 28, 435-453.
[21] Wisniewski, G.  and  Pietruszko, S. M. 1997: “Development of Solar Agricultural Dryers Combined with PV Modules and Solar Collectors”, International Conference on Solar Energy at High Latitude N0 Vol. 7, pp 215-221.