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Sitompul, J. P
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Mechanical Engineering

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STUDI ANALISIS EFISIENSI ENERGI DAN TEKNO EKONOMI PENGERINGAN BUTIRAN MULTI TAHAP Sumardiono, S; Sariyanto, M. W; Sitompul, J. P
Mesin Vol 16, No 1 (2001)
Publisher : Mesin

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Abstract

This paper concerns on analysis of energy in drying operation, because energy is crucial and determines process efficiency throughout. Further, techno-economy is also studied for drying agricultural product, such as paddy, in a multi-stage deep-bed dryer with focussing in study two-stage one. Thermal and drying efficiency have been evaluated from experiment data. Moreover, the techno-economy in view of energy consumption for drying operation is also considered . The analysis shows that the increasing of bed height for constant drying air temperature will significantly increase thermal and drying efficiency as well as energy consumption for dryer operation. Further, thermal efficiency, drying efficiency and energy consumption decreases with increasing the inlet drying air temperature which in turn reducing of drying cost operation. The study shows that the two-stage deep-bed dryer have higher thermal and drying efficiency and lower energy consumption compared to one-stage dryer.
MODEL HETEROGEN PENGERINGAN BUTIRAN JAGUNG DALAM UNGGUN DIAM Istadi, Istadi; Sitompul, J. P
Mesin Vol 15, No 3 (2000)
Publisher : Mesin

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This paper deals with one-dimensional dynamic modelling and simulation of deep -bed com drying by two-phase model or heterogeneous model The models consider mass and heat transfer process within grain and drying air phase. This model also considers moisture content and temperature gradient within grain. The coupled of partial differential equations developed, then solves numerically by finite difference with altemating direction implicit method algorithm. The dynamic models predict not only humidity and temperature of outlet drying air, but also grain moisture content and temperature. The simulated profiles are compared with expenmental data, taken from available literature. The models can describe corn grain drying process in deep -bed dryer. However, the model parameters should be modified to get drying characteristic profiles that closed to the experimenal data.
Co-Authors I. Istadi Sariyanto, M. W Sumardiono, S