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Öğe A new model for single-layer drying(2002) Midilli A.; Kucuk H.; Yapar Z.This paper presents a new empirical model for single layer drying process, which was verified with selected experimental data. The present model is also compared with other single layer drying models available in the literature, using laboratory as well as field data from literature.Öğe Energy and exergy analyses of solar drying process of pistachio(Elsevier Ltd, 2003) Midilli A.; Kucuk H.This paper is concerned with the energy and exergy analyses of the drying process of shelled and unshelled pistachios using a solar drying cabinet. Using the first law of thermodynamics, energy analysis was carried to estimate the amounts of energy gained from solar air collectors and the ratios of energy utilization. However, exergy analysis was accomplished to determine the location, type, and magnitude of exergy losses during the solar drying process by applying the second law of thermodynamics. It was deduced that the exergy losses took place mostly in the 15th shelf where the available energy was less utilized. Moreover, the shelled and unshelled pistachios are sufficiently dried in the ranges between 40 and 60 °C and 37 and 62% of relative humidity at 1.23 m s-1 of drying air velocity in 6 h despite the exergy losses of 0.15-3.08 kJ kg-1. © 2003 Elsevier Science Ltd. All rights reserved.Öğe Mathematical modeling of thin layer drying of pistachio by using solar energy(2003) Midilli A.; Kucuk H.This paper presents a mathematical modeling of thin layer forced and natural solar drying of shelled and unshelled pistachio samples. In order to estimate and select the suitable form of solar drying curves, eight different mathematical models, which are semi-theoretical and/or empirical, were applied to the experimental data and compared according to their coefficients of determination (r,?2), which were predicted by non-linear regression analysis using the Statistica Computer Program. It was deduced that the logarithmic model could sufficiently describe thin layer forced solar drying of shelled and unshelled pistachio, while the two term model could define thin layer natural solar drying of these products in evaluation by considering the coefficients of determination, rsfsd = 0.9983, ?2sfsd = 2.697 × 10-5; rufsd = 0.9990, ?ufsd2 = 1.639 × 10-5 for thin layer forced solar drying and rsnsd = 0.9990, ?snsd2 = 3.212 × 10-6; runsd = 0.9970, ?unsd2 = 4.590 × 10-5 for thin layer natural solar drying. © 2002 Elsevier Science Ltd. All rights reserved.
