Exergy Analysis of Combined Fluidized-Fix Bed Dryer

Document Type : Research Article

Authors

Department of Agrotechnology, College of Aburaihan, University of Tehran, Tehran, I.R. IRAN

Abstract

Exergy analysis is one method for studying of energy efficiency and optimization for systems and machines including dryers. Fluidized bed dryers despite widespread usage have low energy efficiency. Therefore a new method has been proposed that the fluid bed drying has been combined with thick (fix) bed dryer as outlet air from the fluidized bed section is conducted to the thick bed section for drying the other material or same kind material that existed in the first section. Experiments were performed in three temperatures, 50, 60 and 70 °C and three bed depth in down, fluidized bed drying, 4, 6 and 8 cm and two beds depth in up, batch bed drying, 6 and 8 cm. The results show that exergy loss of top floor is lower than down floor. And also increasing in bed depth of down floor causes increasing in exergy loss of top floor, but exergy loss of down floor decreases with increasing in bed depth of top floor.

Keywords

Main Subjects

References

 
[1] Cengel A. Y., Boles M.A., “Thermodynamics an Engineering Approach”, 5th ed., p.442, McGraw-Hill College, Boston, (2006).
[2] پهلوانزاده، ح.؛ قائم مقامی، ف.، تعیین اثر تعداد سینی­های توزیع کننده ماده خشک شونده بر میزان بهینه­سازی مصرف انرژی درخشک کن های بسترسیال، نشریه شیمی و مهندسی شیمی ایران، (4) 28، ص.81 (1388).
[3] Midilli A., Kucuk H., Energy and Exergy Analyses of Solar Drying Process of Pistachio, Energy,  , p.539 (2003).
[4] Akpinar E.K., Energy and Exergy Analyses of Drying of Red Pepper Slices in A Convective Type Dryer, International Communication in Heat And Mass Transfer, 31, p. 1165 (2004).
[5] Ceylan I., Aktas M., Dogan H., Energy and Exergy Analysis of Timber Dryer Assisted Heat Pump, Applied Thermal Engineering, 27, p. 216 (2007).
[6] Aghbashlo M., Kianmehr, M. H., Arabhosseini A., Energy and Exergy Analyses of Thin-Layer Drying of Potato Slices in a Semi-Industrial Continuous Band Dryer, Drying Technology, 26(12), p. 1501 (2008).
[7] Nazghelichi T., Kianmehr M. K., Aghbashlo M., Thermodynamic Analysis of Fluidized Bed Drying of Carrot Cubes, Energy, 35(1), p. 4679 (2010).
[8] Corzo O., Bracho N., Vasquez, A., Pereira, A., Energy and Exergy Analysis of Thin Layer Drying of Coroba Slices, Journal of Food Engineering, 86, p.151 (2008).

Files

Share

How to cite

Statistics