Abstract
Low temperature drying systems are commonly used for the drying of agricultural products. The ones which use solar energy as a heat source have been developed and diffused in the past few years.
The evaluation of drying systems1 performance involves consideration of all the components of the system: solar collectors, driers, etc. The correct understanding and modelling of drying phenomena is of fundamental importance to the system’s simulation. This way, the physical mechanisms involved in a drying process are referred, and methods for predicting the drying behaviour of materials are presented.
The influence of various drying parameters — drying temperature, velocity, direct solar radiation incidence — are analysed, for a forced convection system. For a given solar drying system, the contribution of solar energy is quantified.
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References
Keey, R.B., Progress towards understanding the drying behaviour of materials, Proc. Third Int. Drying Symp., Vol. 1, 1982.
Gilliland, E.A., Fundamentals of drying and air conditioning, Ind. Eng. Chem., Vol. 30, pp. 506, 1938.
Hall, C. et al., Water movement in porous building materials — VI, Building and Environment, Vol. 19, p. 13, 1984.
Oliveira, A.C., Estabelecimento de modelos num0117ricos de sistemas de secagem a baixa temperatura em regime nao permanente, M.Sc. Thesis, University of Porto (Portugal), 1986.
Sokhansanj, S. and Bruce, D., Heat transfer coefficient in drying granular materials, Proc. Fifth Int. Drying Symp., Vol. 2, p. 862, Ed. Hemisphere 1986.
Incropera, F.P. and DeWitt, D.P., Fundamentals of Heat Transfer, John Wiley, 1981.
Whitaker, S. and Chou, W., Drying granular porous media — Theory and experiment, Drying Technology, Vol. 1, p. 3, 1983.
Ceaglske and Hougen, Drying granular solids, Ind. Eng. Chem., Vol. 29, p. 805, 1937.
Hougen et al., Limitations of diffusion equations in drying, Trans. Am. Inst. Chem. Eng., Vol. 36, pp. 183–210, 1940.
Oliveira, A.C. and Fernandes, E.O., Simulation of the convective drying of capillary-porous materials, Proc. Fifth Int. Drying Symp., Vol. 1, p. 65, Ed. Hemisphere, 1986.
Piacentini and Combarnous, Modelisation of fruits drying by solar energy, Proc. First Int. Conf. on Solar Building Technology, Vol. 2, p. 784, Ed. RIBA, 1977.
Rotstein, E., Advances in transport phenomena and thermodynamics in the drying of cellular food systems, Proc. Fifth. Int. Drying Symp., Vol. 1, p. 1, Ed. Hemisphere, 1986.
Sodha, M.S. et al., An analytical and experimental study of open sun drying and a cabinet type drier, Energy Conversion and Management, Vol. 3, pp. 263–271, 1985.
Jayas, D.S. and Sokhansanj, S., Thin-layer drying of wheat at low temperatures, Proc. Fifth Int. Drying Symp., Vol. 2, p. 844, Ed. Hemisphere, 1986.
Verna, L.R. and Noomhom, A., Rice drying simulation, Proc. Fifth Drying Symp., Vol. 2, p. 461, Ed. Hemisphere, 1986.
Ryan, D., Carbonell, R.G. and Whitaker, S., A theory of diffusion and reaction in porous media, Am. Inst. Chem. Eng. Symposium Series, Vol. 77, pp. 46–62, 1981.
Puigalli, J.R. and Lara, M.A., Some experiments about small country solar driers, Proc. Third Int. Drying Symp., Vol. 1, p. 390, 1982.
Quinette, J.Y. et al., Premiers resultats d’exploitation d’un séchoir solaire indirect et d’un séchoir solaire direct dans le Département des Pyrenées-Orientales, Proc. Séchage Solaire et Development Rural, p. 145, 1983.
Chakraverty, A. and Das, S.K., Design and testing of an integrated solar-cum-husk fired paddy drier of one tonne per day capacity, Proc. Fifth Int. Drying Symp., Vol. 2, p. 694, Ed. Hemisphere, 1986.
Imre, L. et al., Construction, simulation and control of a complex and integrated agricultural solar drying system, Proc. Fifth Int. Drying Symp., Vol. 2, p. 678, Ed. Hemisphere, 1986.
Santos, A.S., Contribuição para o estudo experimental da secagem, M.Sc. Thesis, University of Porto (Portugal), 1986.
Fernandes, E.O., Santos, A.S. and Oliveira, A.C., Colectores solares a ar aplicados à secagem, Proc. 1st. Iberian Congress on Solar Energy (ISES), Vol. 2, p. 121, 1982.
Fernandes, E.O. et al., Desenvolvimento de fachadas envidraçadas com colectores a ar, Internal Report, Gab. Fluidos e Calor, University of Porto, 1981
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© 1987 Martinus Nijhoff Publishers, Dordrecht
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Fernandes, E.O., Oliveira, A.C., Santos, A.S. (1987). Low Temperature Drying Systems Insights on the Evaluation of Their Performance. In: Yüncü, H., Paykoc, E., Yener, Y. (eds) Solar Energy Utilization. NATO ASI Series, vol 129. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3631-7_35
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DOI: https://doi.org/10.1007/978-94-009-3631-7_35
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