Experimental Investigation and Theoretical Modelling of Solar Dryer Using Evacuated Tube Collector

Abstract:

An indirect type solar dryer is fabricated with the components like evacuated tube collector, drying chamber and blower. The performance of the drier is evaluated by carrying out drying experiments with copra at Coimbatore district Tamilnadu, India. A short survey of these showed that applying the indirect type solar dryer not only significantly reduced the drying time but also resulted in many improvements in the quality of the dried products. The temperature of the drying chamber ranges from 55°C to 75°C while the ambient temperature ranges from 28°C to 38°C. Nine basic solar drying models were used to fit the experimental data of copra. For experimental results, the logarithmic model showed the best curve fitting with highest correlation coefficient (R²⁾ and lowest value of RMSE (Root Mean Square Error). Solar dried copra obtained is free from smoke, dust, bird and rodent damage.

• Periodical: Applied Mechanics and Materials (Volume 787)
• Pages: 147-151
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.787.147
• Online since: August 2015
• Authors: R. Manivel, S. Sivakumar, T. Rajagopal
• Keywords: Copra, Correlation Coefficient, Evacuated Tube Collector, Forced Convection, Regression

References

[1] V. Shanmugam, E. Natarajan, Experimental investigation of forced convection an desiccant integrated solar dryer, Renewable Energy. 31(2006) 1239–1251.

DOI: 10.1016/j.renene.2005.05.019

[2] Chr. Lamnatou, E. Papanicolaou, V. Belessiotis, N. Kyriakis, Experimental investigation and thermodynamic performance analysis of a solar dryer using an evacuated-tube air collector, Applied Energy. 94 (2012) 232-243.

DOI: 10.1016/j.apenergy.2012.01.025

[3] Ahmed Abed Gatea, Performance evaluation of a mixed-mode solar dryer for evaporating moisture in beans, Journal of Agricultural Biotechnology and Sustainable Development. 3 (2011) 65-71.

[4] E. Kavak Akpinar, Mathematical modelling and experimental investigation on sun and solar drying of white mulberry, Journal of Mechanical Science and Technology. 22 (2008) 544-1553.

DOI: 10.1007/s12206-008-0508-4

[5] S.H. Ghatrehsamani, M. Dadashzadeh, A. Zomorodian, Kinetics of apricot thin layer drying in a mixed and indirect mode solar dryer, International Journal of Agriculture Sciences. 4 (2012) 262-267.

DOI: 10.9735/0975-3710.4.6.262-267

[6] M. Mohanraj, P. Chandrasekar, Performance of a forced convection solar drier integrated with gravel as heat storage material for chilli drying, Journal of Engineering Science and Technology. 4 (2009) 305-314.

[7] T. Thiruchelvam, D. A. D. Nimal, S. Upali, Comparison of quality and yield of copra processed in CRI improved kiln drying and sun drying. Journal of Food Engineering, 78 (2007) 1446–1451.

DOI: 10.1016/j.jfoodeng.2006.01.016

[8] G. R. Gamea, A. T. Taha, Mathematical models of grapes Solar drying, Journal of Applied Science Research. 8 (2012) 5708-5723.

[9] Gokhan Gurlek, Necdet Ozbalta, Ali Gungor, Solar tunnel drying characteristics and mathematical modelling of tomato, Journal of Thermal Science and Technology. 29 (2009) 1300-3615.