Analysis of Condensation in Rough Rice during Storage

概要

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Analysis of condensation in long grain rough rice (c. v. L201) under various air temperatures (14°C, 20°C, 26°C and 32°C) and relative humidity (40%, 60%, 80% and 98%) was performed. Based on simulation of the heat and mass balance during condensation, models for estimation of condensation amount were established. By applying drying theory of the Sphere drying model, adsorption equilibrium moisture content Me and drying constant K were evaluated and continuous grain moisture changes deduced from which the adsorption and dew formation were evaluated. Computed results compared well with experimental results. Condensation amount depended on the grain initial temperature, moisture content and air conditions. Condensation on rough rice grain initially at 17.8% moisture content (w. b.), and air temperatures 14°C, 20°C, 26°C and 32°C corresponded to hue values 31°, 28°, 27° and 26° respectively at a constant relative humidity of 80% (initial grain hue value 33°) thus indicating incidences of dew formation on the grain surface.
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