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Mathematical modelling of thin layer hot air drying of apricot with combined heat and power dryer

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Abstract

In this study thermal energy of an engine was used to dry apricot. For this purpose, experiments were conducted on thin layer drying apricot with combined heat and power dryer, in a laboratory dryer. The drying experiments were carried out for four levels of engine output power (25 %, 50 %, 75 % and full load), producing temperatures of 50, 60, 70, and 80 ° C in drying chamber respectively. The air velocity in drying chamber was about 0.5 ± 0.05 m/s. Different mathematical models were evaluated to predict the behavior of apricot drying in a combined heat and power dryer. Conventional statistical equations namely modeling efficiency (EF), Root mean square error (RMSE) and chi-square (χ2) were also used to determine the most suitable model. Assessments indicated that the Logarithmic model considering the values of EF = 0.998746, χ 2 = 0.000120 and RMSE = 0.004772, shows the best treatment of drying apricot with combined heat and power dryer among eleven models were used in this study. The average values of effective diffusivity ranged 1.6260 × 10−9 to 4.3612 × 10−9 m2/s for drying apricot at air temperatures between 50 and 80 °C and at the air flow rate of 0.5 ± 0.05 m/s; the values of Deff increased with the increase of drying temperature the effective diffusivities in the second falling rate period were about eight times greater than that in the first falling rate period.

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Acknowledgments

The authors wish to thank the Iranian Fuel Conservation Organization (IFCO) of NIOC for the research grant provided to complete this project and Tarbiat Modares University for providing of laboratory facilities.

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Authors and Affiliations

  1. Department of Agricultural Machinery Engineering, Faculty of Agriculture, Tarbiat Modares University, P.O.Box: 14115-336, Tehran, Iran

    Saeed Faal, Teymor Tavakoli & Barat Ghobadian

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  1. Saeed Faal
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  2. Teymor Tavakoli
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  3. Barat Ghobadian
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Correspondence to Teymor Tavakoli.

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Faal, S., Tavakoli, T. & Ghobadian, B. Mathematical modelling of thin layer hot air drying of apricot with combined heat and power dryer. J Food Sci Technol 52, 2950–2957 (2015). https://doi.org/10.1007/s13197-014-1331-9

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  • DOI: https://doi.org/10.1007/s13197-014-1331-9

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