動態平衡含水率於玉米粒幹燥之評估

The Evaluation of Dynamic Equilibrium Moisture Content on the Drying of Corn Kernels

陳加忠(Chia-Chung Chen)

《農業機械學刊》 1卷2期 (1992/04) Pp. 38-45

https://doi.org/10.30062/JAM.199204.0005

摘要

多年來，穀物乾燥之薄層乾燥方程式皆利用平衡含水率模式以計算乾燥過程所能到達之最後平衡含水率。由於在高與低相對濕度環境下，此平衡含水率之觀念並不適用，而且在乾燥試驗中高溫環境之平衡含水率數值難以測量，因此以平衡含水率之數值以為乾燥過程之最後含水率之數值其有效性難以完全成立。
此研究中，以最後平衡含水率為薄層乾燥模式之一定參數，因此模式可轉換為一非線性模式，此參數稱為動態平衡含水率。由乾燥實驗數據與非線性迴歸技術，可計算此動態平衡含水率之數值。薄層乾燥方程式之適稱性得到顯著地改善。動態平衡含水率與乾燥熱風溫度，穀物之關係可加以建立。此種直接且準確的方式可提供適用的動態平衡含水率數值以供乾燥模擬作業。

關鍵字

幹燥 ； 動態平衡含水率

並列摘要

Equilibrium moisture content (EMC) equations have been widely applied to the calculations of the final equilibrium moisture contents for thin-layer drying of grains for many years. Because the EMC concept is inadequate to explain at the high and low relative humidities, in addition, the EMC data are difficult to collect at high temperatures of drying, it is doubtful to use the EMC values as the final EMC values on drying process.
In this study, final equilibrium moisture was assumed as a parameter for the thin-layer drying equation, and then the equation was transformed to a nonlinear model. The new parameter is called dynamic equilibrium moisture content (DEMC, or Mde). From the drying results (moisture vs. time) and nonlinear regression analysis technique, Mde values could be obtained easily. The fitting-agreement of thin-layer drying equations is also improved significantly. The relationship among Mde, drying air, and grain properties could be established. This provides direct, reasonable, and accurate method for obtaining adeqluate Mde values for drying simulation.

並列關鍵字

Drying ； Dynamic EMC