Analisis distribusi suhu, aliran udara, Rh dan kadar air dalam In-store dryer (ISD) untuk biji jagung

Abstract

In-Store Dryer (ISD) is commonly used as second step in drying process of grains. ISD is usually utilized ambient temperature and consist of dryer and storage system. Temperature, air flow and RH are key parameters during drying process using ISD. The objective of this study were to analyze the distribution of temperature, air flow, RH and water content inside ISD and to analyze the quality of shelled corn during drying process. Computational Fluid Dynamic (CFD) was used to analyze the distribution of temperature, air flow and RH inside ISD. Deep bed drying process was used to analyze the distribution of water content. The capacity of ISD used in this study was 7500 kg of corn, with dimensions of 3.5 m in high and 2.5 m in diameter. ISD have 13 aeration pipes of air flow, consist of 9 input pipes and 4 output pipes. All walls of ISD were assumed to be in condition of adiabatic. Validation of water content that simulation with the measurement has been done at capacity of ISD were 1500 kg. The result showed that CFD simulation of temperature, air flow and RH have coefficient of correlation of 0.66, 0.73 and 0.66 respectively. Deep bed drying simulation of water content at Layer 10 and 40 have coefficient of correlation of 0.90 and 0.35 in rainy season, 0.88 and 0.84 in dry season. The results showed that only a minor changes in the quality of shelled corn dried and stored using ISD.