Title page for ETD etd-10122005-134420
|Type of Document
||Kulasiri, G. Don
||Simulation of deep-bed drying of Virginia peanuts to minimize energy use
|Vaughan, David H.
|Cundiff, John S.
|Perumpral, John V.
|Wilcke, William F.
|Wright, F. Scott
- Food Drying Equipment and supplies
- Peanuts Virginia
|Date of Defense
A deep-bed drying model simulating the drying of peanuts in a fixed bed is
required for designing energy-efficient and automatically controlled dryers. A
deep-bed drying model consists of a thin-layer drying model to calculate the moisture
release from the material and a set of mass and energy balances. An experimental
setup was constructed to determine drying rates of Virginia-type peanuts under 14
different drying air conditions. Selected empirical and semi-theoretical models
available for modeling thin-layer drying rates were fitted to the collected data using
nonlinear regression techniques. The modified Page's model and the two-term
exponential model fitted the data better than other models considered. A deep-bed
drying model PEATECH based on four coupled partial differential equations consisting
of four variables, air temperature, peanut temperature, air humidity, and peanut
moisture content was developed. Validation of the model was accomplished by using
the data collected from 36 deep-bed drying experiments conducted using three
laboratory dryers during 1987, 1988, and 1989. PEATECH predicted the variables within a peanut bed with an accuracy of less than ± 6%. The energy saving potential
of exhaust-air recirculation was established by conducting simulated experiments
using a modified version of PEA TECH.
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