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research-article

Drying kinetics, quality assessment and economic analysis of bitter gourd flakes drying inside forced convection greenhouse dryer

[+] Author and Article Information
Prashant Singh Chauhan

Department of Mechanical Engineering, Gaya College of Engineering, Srikrishna Nagar, Gaya (Bihar) 823003Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla-90112 (Thailand)
prashant_srit@yahoo.co.in

Anil Kumar

Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla-90112 (Thailand)Department of Energy (Energy Centre), Maulana Azad National Institute of Technology, Bhopal-462003 (India)
anilkumar76@gmail.com

Chayut Nuntadusit

Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla-90112 (Thailand)
chayut.n@gmail.com

Shyam Sunder Mishra

Department of Chemical Engineering, Chandigrah University, Chandigrah-140413 (India)
mishras0319@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4039891 History: Received July 11, 2017; Revised March 16, 2018

Abstract

A greenhouse dryer under forced convection mode is designed and fabricated with integration of solar collector. The developed system is used for bitter gourd flakes drying in three different air mass flow rates (0.0275, 0.0551 and 0826 kg/s). Moisture content of bitter gourd flakes was decreased effectively from 96.8 % to 12.2 % in 17 h with optimum air mass flow rate 0.0551 kg/s, whereas, open sun drying was taken 26 h to reach 20.7 % moisture content. The average greenhouse dryer efficiency was found 19.7 % at 0.0551 kg/s air mass flow rate. Percentage of shrinkage of dried bitter gourd flakes was found higher at 0.0275 kg/s air mass flow rate due to higher inside greenhouse room air temperature. Hardness of dried bitter gourd flakes was found highest as 365 gm at 0.0275 kg/s air mass flow rate due to less air exchange rate and high inside room temperature. On the basis of statistical analysis, Prakash and Kumar and Logarithmic model were selected as best drying models for greenhouse and open sun drying respectively. The dehydration of higher moisture content crops inside developed greenhouse dryer was found more consistent. The developed dryer is recommended to produce better quality of dried product as compared to open sun drying for high moisture content crop.

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