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Sorption isotherms of agricultural products

Author

Listed:
  • I. Vitázek

    (Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic)

  • J. Havelka

    (Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic)

Abstract

The aim of the paper is to expand the theory of sorption and equilibrium moisture contents as well as to present the methodology of developing two types of sorption isotherms - I and II. The attention is also paid to the importance of the isotherms in the thermodynamics of drying and in the process of storage of agricultural products. Presented methodology of obtaining the isotherms is based on selected equations of the theory of adsorption and on the results of experimental measurements of equilibrium moisture content. Definition of the new isotherm II is introduced as dependence of equilibrium moisture content dry basis on time at constant temperature, constant relative moisture of the ambient air and stable biological properties (e.g. germination). The results show following graphic dependences: isothermal distort plane; sorption isotherm I of maize grains at various temperatures; moisture loss rate in dependence on time and sorption isotherm II. These theoretical dependences supported by experimental measurements broaden the scope of the theory of sorption and may be successfully applied in long-term storage of maize grains.

Suggested Citation

  • I. Vitázek & J. Havelka, 2014. "Sorption isotherms of agricultural products," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 60(SpecialIs), pages 52-56.
    • Handle: RePEc:caa:jnlrae:v:60:y:2014:i:specialissue:id:35-2013-rae
    DOI: 10.17221/35/2013-RAE
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    Cited by:

    1. Adolf Rybka & Petr Heřmánek & Ivo Honzík, 2021. "Effect of drying temperature in hop dryer on hop quality," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 67(1), pages 1-7.
    2. Adolf RYBKA & Karel KROFTA & Petr HEŘMÁNEK & Ivo HONZÍK & Jaroslav POKORNÝ, 2018. "Effect of drying temperature on the content and composition of hop oils," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 64(10), pages 512-516.

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