Thermal Performance Study of Solar Air Dryers for Cashew Kernel: A Comparative Analysis and Modelling Using Response Surface Methodology (RSM) and Artificial Neural Network (ANN)

In this study, a new procedure for drying of cashew kernels is proposed. The new methodology involves the use of solar air dryers to remove the dark sticky coating called testa on the surface of the cashew kernel to get the final product. There are several challenges in the new procedures, especially with respect to the moisture level to be retained in the cashew kernel post drying for facilitating the optimal peeling activity. In this regard, thermal performance is carried out through a set of experimental and computational trials. The experiments have revealed that the natural and forced convection solar dryers with drying speeds of 1.0 kg/h and 1.66 kg/h, respectively, showed drying efficiencies of 51.7% and 50.9%, which is within the permissible acceptable limit, thus ascertaining a moisture reduction of 40 to 42% in each of case and keeping the moisture content within the band of approximately 5%, required for effective peeling of the testa from the cashew kernel to obtain the final product. This new method has resulted in batch drying of cashew kernels of up to 30 kg capacity in a time span of 360 minutes of solar irradiation with an average consumption of 255 kJ. The results of the experiments are also validated from the artificial neural network (ANN) and response surface methodology (RSM) modelling, resulting in better prediction and optimization of the performance parameters. The error between the actual and experimental values is well within the permissible limit of +/-5%, thereby correlating the experimental and statistical values for deriving an ANN model for predicting the results for different time duration and solar irradiation. In this way, the thermal analysis of the solar dryers for drying cashew kernels has resulted in findings, which shall be utilized to improve the overall performance efficiency and the methodology adopted for maximum yield.

[1]  Vivekanand B. Huddar,et al.  Turbulent Flow in Forced Convection Heat Transfer - Numerical Validation , 2022, International Journal of Vehicle Structures and Systems.

[2]  M. A. Kamoji,et al.  Experimental investigation on performance of small passive solar greenhouse dryer for cashew kernel drying , 2019 .

[3]  Niyaz Mohammad Mahmoodi,et al.  Mesoporous activated carbons of low-cost agricultural bio-wastes with high adsorption capacity: Preparation and artificial neural network modeling of dye removal from single and multicomponent (binary and ternary) systems , 2018, Journal of Molecular Liquids.

[4]  Shahrbanou Shamekhi-Amiri,et al.  Drying behaviour of lemon balm leaves in an indirect double-pass packed bed forced convection solar dryer system , 2018, Case Studies in Thermal Engineering.

[5]  S. I. Gilani,et al.  Performance analysis of a multi-pass solar thermal collector system under transient state assisted by porous media , 2017 .

[6]  Man-Hoe Kim,et al.  Performance improvement of double-pass solar air heater – A state of art of review , 2017 .

[7]  R. P. Saini,et al.  Experimental investigation on performance of a double pass artificial roughened solar air heater duct having roughness elements of the combination of discrete multi V shaped and staggered ribs , 2016 .

[8]  Aydin Durmus,et al.  Drying of sweet basil with solar air collectors , 2016 .

[9]  R. P. Saini,et al.  A review on different techniques used for performance enhancement of double pass solar air heaters , 2016 .

[10]  K. Mayilsamy,et al.  Performance improvement studies in a solar greenhouse drier using sensible heat storage materials , 2016 .

[11]  D. R. Pangavhane,et al.  EXPERIMENTAL AND THEORETICAL STUDY OF THOMPSON SEEDLESS GRAPES DRYING USING SOLAR EVACUATED TUBE COLLECTOR WITH FORCE CONVECTION METHOD , 2015 .

[12]  Saravanan Dhanushkodi,et al.  Life Cycle Cost of Solar Biomass Hybrid Dryer Systems for Cashew Drying of Nuts in India , 2015 .

[13]  Raheleh Nowzari,et al.  Finding the best configuration for a solar air heater by design and analysis of experiment , 2015 .

[14]  P. Velmurugan,et al.  Thermal Performance Studies on Multi-pass Flat-plate Solar Air Heater with Longitudinal Fins: An Analytical Approach , 2015 .

[15]  L. Aldabbagh,et al.  Single and double pass solar air heaters with partially perforated cover and packed mesh , 2014 .

[16]  A. Farhat,et al.  Performance of a new solar air heater with packed-bed latent storage energy for nocturnal use , 2013 .

[17]  A. A. El-Sebaii,et al.  Experimental investigation of an indirect-mode forced convection solar dryer for drying thymus and mint , 2013 .

[18]  W. Beckman,et al.  Solar Engineering of Thermal Processes: Duffie/Solar Engineering 4e , 2013 .

[19]  A. O. Adelaja,et al.  Analysis and Testing of a Natural Convection Solar Dryer for the Tropics , 2013 .

[20]  A. Zomorodian,et al.  Designing and Evaluating an Innovative Solar Air Collector with Transpired Absorber and Cover , 2012 .

[21]  A. G. Mohod,et al.  Quantification of energy consumption for cashew nut (Anacardium occidentale L.) processing operations , 2011 .

[22]  K. Kalidasa Murugavel,et al.  Performance study on basin type double slope solar still with different wick materials and minimum mass of water , 2011 .

[23]  A. G. Mohod,et al.  Energy Option for Small Scale Cashew Nut Processing in India , 2010 .

[24]  C. Gueymard.  Direct and indirect uncertainties in the prediction of tilted irradiance for solar engineering applications , 2009 .

[25]  Niyaz Mohammad Mahmoodi,et al.  Nanophotocatalysis using nanoparticles of titania: Mineralization and finite element modelling of Solophenyl dye decolorization , 2007 .

[26]  M. L. Ray,et al.  Determination of the average coefficient of internal moisture transfer during the drying of a thin bed of potato slices , 2001 .

[27]  Vijayanandraj Selvaraj,et al.  Drying of carrot slices in a triple pass solar dryer , 2017 .

[28]  Kamaruzzaman Sopian,et al.  Performance Evaluation of a Novel Multi-pass Solar Air Heating Collector , 2016 .

[29]  R. Oommen.  Fabrication and Performance evaluation of a v- groove solar air heater , 2013 .