Thin Layer Peach Drying in Solar Tunnel Drier
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ORIGINAL ARTICLE / ORIGINALBEITRAG
Thin Layer Peach Drying in Solar Tunnel Drier Sevil Karaaslan1 · Kamil Ekinci1 · Can Ertekin2 · Barbaros S. Kumbul1 Received: 12 December 2018 / Accepted: 9 October 2020 © Springer-Verlag GmbH Deutschland, ein Teil von Springer Nature 2020
Abstract This study presents performance of the solar tunnel dryer for drying of peach samples. The solar tunnel dryer consists of a flat plate solar collector, a drying tunnel, a solar cell module and a small axial fan. It has been constructed at the Department of Agricultural Machinery and Technologies Engineering at Isparta University of Applied Sciences. During the drying process, solar irradiation, drying air temperature, relative humidity, and air velocity were measured constantly in different parts of the dryer. At same time, mass loss of the peach samples was measured during the drying period at one-hour interval. In this study, the color measurements fresh and dried products were determined at the beginning and end of experiment. The fresh peach samples were sorted, graded, washed by tap water and then sliced manually as half-moon without peeling before pretreatment. Sun drying behavior of sliced peach samples pretreated with 1% sodium metabisulfit, 1% ascorbic acid and non-pretreated was investigated. The drying characteristic curves were evaluated against ten mathematical models. Results showed that the Midilli et al. model was found to be the best descriptive model for solar tunnel drying of thin layer peach.
Keywords Drying characteristics · Peach · Solar tunnel dryer · Mathematical modelling
Trocknung von Pfirsichen in solarem Tunneltrockner Schlüsselwörter Trocknungseigenschaften · Pfirsich · Solarer Tunneltrockner · Mathematische Modellierung
Introduction Peach is originated in China and were introduced to Persia and Mediterranean region along the Silk Road before Christian times (Zhu and Shen 2014). The annual World production of peaches and nectarines was 21.64 mio. t in 2013. China (6.51 mio. t), Italy (1.57 mio. t) and USA (1.28 mio. t) are the main producers of peach and nectarines. Turkey produced about 0.64 mio. t in 2013 (FAOSTAT 2016). Peaches
Sevil Karaaslan
[email protected] 1
Faculty of Agricultural Sciences and Technologies, Department of Agricultural Machinery and Technologies Engineering, Isparta University of Applied Sciences, Isparta, Turkey
2
Faculty of Agriculture, Department of Agricultural Machinery and Technologies Engineering, University of Akdeniz, Antalya, Turkey
can provide high nutrition, proteins, energy, minerals and vitamins (Sablani 2006). They are grown for table purposes and processing. It can be consumed fresh and in other forms such as juice, jam, jelly, fruit sauces, candy bars, fruit leather, in yoghurt and bakery products (Kingsly et al. 2009; Johnson and Mukhaini 2016). Fruits are seasonal and generally available during a particular season of the year. Especially peach fruit is highly perishable, difficult to store and transport, thus, they must be preserved in any form
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