218 Int. J. Exergy, Vol. 22, No. 3, 2017 Copyright © 2017 Inderscience Enterprises Ltd. Energy and exergy analysis of fluidised bed citric acid dryers Mahdi Deymi-Dashtebayaz Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, 9617976487, Iran Email: m.deimi@hsu.ac.ir Ahmad Arabkoohsar* Department of Mechanical Engineering, Azadshahr Branch, Islamic Azad University, Azadshahr, 4961789985, Iran Email: mani.koohsar@yahoo.com *Corresponding author Farid Darabian Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, 9617976487, Iran Email: darabianfarid@gmail.com Abstract: Fluidised bed dryers are widely used for removing all or a portion of moisture in products in food, agricultural and chemical industries. In this work, a comprehensive first and second law analysis on fluidised bed dryers employed in acid citric production factories are accomplished. To have an accurate simulation, fluidised bed dryer of Jovein factory, as the biggest citric acid factory of Middle East, has been chosen as the case study of this work. In the end, the origins of exergy destruction and energy wastes are recognised and some proposals are presented for optimising the thermodynamic performance of the dryer. Taking the results of this study into account, it is finally found out that reducing drying air flow rate and temperature, decreasing the outlet product humidity and lower heat loss rates enhance both energy and exergy efficiencies. Keywords: fluidised bed dryer; citric acid crystal; energy analysis; exergy analysis; sensitivity analysis. Reference to this paper should be made as follows: Deymi-Dashtebayaz, M., Arabkoohsar, A. and Darabian, F. (2017) ‘Energy and exergy analysis of fluidised bed citric acid dryers’, Int. J. Exergy, Vol. 22, No. 3, pp.218–234. Biographical notes: Mahdi Deymi-Dashtebayaz has been an Assistant Professor in the Department of Mechanical Engineering, Hakim Sabzevari University since June 2014 and his main teaching contributions for undergraduates is Engineering Thermodynamic and Exergy for Postgraduate