Exergetic analysis of deep-bed drying of rough rice in a convective dryer

This research work was aimed at a detailed exergy analysis of paddy deep-bed drying process in a laboratory-scale convective dryer. The drying experiments were conducted at different inlet drying air temperatures and flow rates, and exergy loss, exergy destruction, exergy efficiency, improvement pot...

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Bibliographic Details
Published in:Energy (Oxford) 2017-12, Vol.140, p.374-382
Main Authors: Beigi, Mohsen, Tohidi, Mojtaba, Torki-Harchegani, Mehdi
Format: Article
Language:English
Subjects:
Air flow
Air temperature
Deep-bed drying
Destruction
Drying
Energy efficiency
Exergy
Exergy destruction
Exergy efficiency
Flow rates
Flow velocity
Rice fields
Rough rice
Studies
Sustainability
Thermodynamics
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Summary:This research work was aimed at a detailed exergy analysis of paddy deep-bed drying process in a laboratory-scale convective dryer. The drying experiments were conducted at different inlet drying air temperatures and flow rates, and exergy loss, exergy destruction, exergy efficiency, improvement potential rate and sustainability index were investigated. Normalized exergy destruction of the process ranged from 1.67 to 7.46. Exergy efficiency of the drying process and drying chamber was specified to be in the ranges of 5.10–29.41% and 32.64–67.75%, respectively. The results indicated that applying higher drying air temperatures resulted in higher exergy efficiencies. The obtained improvement potential rates showed that the process is highly capable of ameliorating exergy performance improvement. The sustainability index of drying process ranged from 1.05 to 1.42, augmenting with the increase in the air temperature. •Detailed exergy analysis was undertaken for paddy drying in a hot air dryer.•Influences of air temperature and velocity on exergetic performance were studied.•Exergy efficiency of the process decreased with rising the air velocity.•The process has a great capability for exergy performance improvement.•The sustainability index of the process increased with increasing air temperature.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2017.08.100