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Sulikah .
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Agriculture, Biological Sciences & Forestry

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Pemodelan Dan Simulasi Pengeringan Jagung Pipilan Dalam Pengering Rotari Tumpukan Leopold Oscar Nelwan; I Nengah Suastawa; Sulikah .
Jurnal Keteknikan Pertanian Vol. 22 No. 2 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.022.2.%p

Abstract

A mathematical model of shelled corn drying has been developed in order to simulate the distribution of drying air temperature and humidity as well as the grain moisture content in a rotary bed dryer. The model was based on heat and mass balance of cylindrical packed bed of grain with airflow passing through the bed. Whenever the air relative humidity is higher than the equilibrium moisture content, it is assumed the condensation process will be occurred. Finite difference method with Euler scheme was used to perform the computation. The result showed that the model developed can predict the distribution ofgrain temperature and moisture content. The simulation conducted showed that there would be a wide variation ofmoisture content and temperature if mixing was not applied during the drying process. Mixing was significantly reduced the moisture content variation until a maximum of 0.8% w.b.Keywords: rotary bed drying, mathematical model, simulation, corn dryingDiterima: 5 Februari 2008; Disetujui: 26 Juni 2008
Disain dan Uji Kinerja Pengering Rotari Tumpukan untuk Pengeringan Jagung Pipilan Sulikah .; Leopold Oscar Nelwan; I Nengah Suastawa
Jurnal Keteknikan Pertanian Vol. 22 No. 2 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.022.2.%p

Abstract

A rotary bed dryer for grain had been developed and tested in this study. The dryer was designed in order to provide an effective mixing effect. The dryer used perforated cylindrical drum for its chamber and was rotated by an electrical motor. The result showed that when the numbers of rotation was 20, the shelled corn had been mixed effectively. To meet this condition, the drum was rotated for 5 minutes every 15 minutes during the drying process. As the result, the variation of moisture Qontent in radial direction was less than 1.1% w.b. With drying air temperature of 670C and 600C the specific energy consumption of the dryer were 5.6 MJ/kg to reduce the moisture content from 25 to 16% b.b. and 5.4 MJ/kg from 17 to 13% w.b. Thermal energy was the highest contributor of total energy consumption. As it had been expected, the full load of the dryer provided a lower mechanical energy requirement than the half load. Keywords: rotary bed dryer, mixing, specific energy consumption Diterima: 5 Februari 2008; Disetujui: 10 Juni 2008
Co-Authors I Nengah Suastawa Nelwan, Leopold Oscar