An Experimental Investigation on Indirect Solar Dryer for Drying Sliced Onions using Phase Change Materials (PCM)
J. Environ. Nanotechnol., Volume 14, No 1 (2025) pp. 230-238
Abstract
The food industry primarily utilizes sun dryers to extract moisture in order to preserve edible items such as cereals, vegetables, fish, etc. The performance of an indirect, single-pass, forced convection solar dryer with and without paraffin, a phase change material (PCM), integrated into the solar collector, was assessed in this work. Improving the drying efficiency of sliced onions was the main goal, especially when there was little to no sunlight. In this design, the heating-and-drying chamber could hold 1.5 kg of vegetables. A glass cover with dimensions of 100 × 300 cm² was used for the collector. A net served as the screen or tray inside the dryer. Three trays, each measuring 21 × 50 cm and framed with wooden edges. The findings showed that by prolonging the drying process past the sunlight period and sustaining high temperatures inside the drying chamber, adding lauric acid as a PCM greatly enhanced the dryer's performance. The current study carried out mathematical modeling with seven semi-empirical models and drying characteristics of onion slices. The study thoroughly examined important process variables for both dryer designs, moisture ratio (MR), and moisture removal rate. Tray 1 with PCM reached an MR of about 0.2 within 5 hours, while the same tray without PCM reached the same MR in approximately 6 hours. The Logarithmic model proved the best among all the different models fitted for onions dried with PCMs. Overall, the research results demonstrate the great potential of PCM integration to improve the efficacy and efficiency of solar dryers, especially in areas with fluctuating solar radiation.
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Reference
Abdalla, M., Elhassan, U. H. M. K., Abdel, M. O. A. B., Mortada, H. A. E., Idriss, S. E. and Figeada, S. O. A., Comparative Study between Open-direct Sun and Solar Drying of Onion Slices (Allium cepa L.), Am. J. Open Res., 2(6), 226-234(2023).
https://doi.org/10.58811/opsearch.v2i6.16
Abdel-Galil, H. S. and R. I. A. Mourad, A solar dryer performance of onion slices under Fayoum climatic conditions, Misr. J. Agri. Eng., 26(2), 953-976(2009).
Akter, F., Ripa, M., Sfroza, S. and Ujjwal, K. D., A comprehensive review of mathematical modeling for drying processes of fruits and vegetables, Int. J. Food Sci., 2022(1), 6195257(2022).
https://doi.org/10.1155/2022/6195257
Chaatouf, D., Mourad, S., Railani, B., Samir, A. and Ahmed, M., Assessment of a heat storage system within an indirect solar dryer to improve the efficiency and the dynamic behavior, J. Energy Storage, 41, 102874(2021).
https://doi.org/10.1016/j.est.2021.102874
Compaoré, A., Putranto, A., Dissa, A. O., Samuel, O., Romain, R., Yann, R., Andre, Z., Antoine, B. and Jean, K., Convective drying of onion: modeling of drying kinetics parameters, J. food sci. technol., 56, 3347-3354(2019).
https://doi.org/10.1007/s13197-019-03817-3
Evin, D., Thin layer drying kinetics of Gundelia tournefortii L., Food and Bioprod. Process., 90(2), 323-332(2012).
https://doi.org/10.1016/j.fbp.2011.07.002
Hanafy, W. M. and Tarabye, H. H. H., Design New Prototype of An Indirect Solar-Electrical Dryer to Dry White Onions Slices, Misr. J. Agri. Eng., 36(2), 535-564(2019).
Hii, C. L., Chiang, C. L. and Putranto, A., Modelling heat and mass transfer processes during drying: Empirical, theoretical and reaction engineering approach, AIP Conf. Proc., 2586(1), 060011(2023).
https://doi.org/10.1063/5.0105710
Inyang, U. E., Oboh, I. O. and Etuk, B. R., Kinetic models for drying techniques—food materials, Adv. Chem. Eng. Sci., 8(2), 27-48(2018).
https://doi.org/10.4236/aces.2018.82003
Jahromi, M. S. B., Vali, K., Hadi, S. A. and Kargarsharifabad, H., Recent progress on solar cabinet dryers for agricultural products equipped with energy storage using phase change materials, J. Energy Storage, 51, 104434(2022).
https://doi.org/10.1016/j.est.2022.104434
Lad, P., Rahul, K., Rajat, S. and Jatin, P., Numerical investigation of phase change material assisted indirect solar dryer for food quality preservation, Int. J. Thermofluids, 18, 100305(2023).
https://doi.org/10.1016/j.ijft.2023.100305
Mojarrad, M., Rahimi, A., Abdullahpour, M. and Takzadeh, A., Modeling and Experimental Investigation a Solar Tray Dryer with Indirect Forced Convection using Phase Change Materials, J. Sol. Energy Res., 2(1), 43-47(2017).
Ramirez, C. M., Palacio, M. and Carmona, M., Reduced model and comparative analysis of the thermal performance of indirect solar dryer with and without PCM, Energies, 13(20), 5508(2020).
https://doi.org/10.3390/en13205508
Safarov, J., Akhtam, K., Shakhnoza, S., Ulugbek, K. and Sunil, V., Research on energy efficient kinetics of drying raw material, EDP Sci., 216, 01093(2020).
https://doi.org/10.1051/e3sconf/202021601093
Salve, S. and Fulambarkar, A., Performance investigation of solar air dryer with and without PCM based heat storage material for agricultural products drying, AIP Conf. Proc., 2653, 040003(2022).
https://doi.org/10.1063/5.0113491
Savitha, S., Chakraborty, S. and Thorat, B. N., Drying of onion shreds in corrugated electric and solar-conduction dryers: Techno-economic evaluation and quality degradation kinetics, Drying Technol., 41(11),1859-1877(2023).
https://doi.org/10.1080/07373937.2023.2198592
Walke, S., Manoj, M., Makarand, N. and Ravi, T., Dehydration of Onion Slices for Food Processing Application Using Internet of Things-Based Smart Solar Drying System, J. Sol. Energy Eng., 147(1), 014501(2025).
https://doi.org/10.1115/1.4065981
Yadav, C. O. and Ramana, P. V., Experimental Investigation of the Solar Dryer Using Phase-Change Material, Springer, 161, xx(2020).
https://doi.org/10.1007/978-981-32-9578-0_17
Zogzas, N. P., Maroulis, Z. B. and Marinos, K. D., Moisture diffusivity data compilation in foodstuffs, Drying Technol., 14(10), 2225-2253(1996).
