บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Correlation for the automatic identification of drying endpoint in near-ambient dryers: Application to malting barley

A. Ryniecki, M. Gawrysiak-Witulska and J. Wawrzyniak

Biosystems Engineering, Volume 98, Issue 4, December 2007, Pages 437-445

2007

บทคัดย่อ

Correlation for the automatic identification of drying endpoint in near-ambient dryers: Application to malting barley

A method was developed for the automatic endpoint determination of near-ambient barley drying in static deep beds, based o­n a correlation to infer grain moisture content of the top layer, using a continuous o­n-line measurement of relative humidity and temperature of outlet air. The correlation was based o­n an equilibrium isotherm equation, modified by an empirical constant accounting for the non-equilibrium nature of drying. The modifying constant was fitted using results from nine laboratory experiments and validated in an o­n-farm drying experiment. Three desorption isotherm equations, specific for barley, were investigated: modified Henderson, Chung and Chung–Pfost equations. The correlation relationship developed from the Chung–Pfost isotherm equation and modified by the authors by the addition of a constant of 0.0213 kg kg−1 d.b. predicted moisture content in a 2-m-thick fixed-bed of malting barley cv. Annabell during the final phase of drying better than the other equations (in a climate that is the mixture of maritime and continental climates). The estimated accuracy of the proposed method is sufficient for practical applications with the post-harvest conservation of barley.