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Development of a solar-assisted dryer and evaluation of energy requirement for the drying of onion

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  • Sarsavadia, P.N.

Abstract

A solar-assisted forced convection dryer was developed to study the effect of airflow rate (2.43, 5.25, 8.09kg/min), air temperature (55, 65, 75°C), and fraction of air recycled (up to 90%) on the total energy requirement of drying of onion slices. The dryer was provided with a flat plate solar air heater having both the corrugations and triangular fins to the absorber plate. For drying of onion slices from initial moisture content of about 86% (wet basis) to final moisture content of about 7% (wet basis), the energy required per unit mass of water removed during without using recirculation of air was found between 23.548 and 62.117MJ/kg water. The percent energy contribution by the solar air heater, electrical heater, and blower was found between 24.5% and 44.5%, 40.2% and 66.9%, and 8.6% and 16.3%, respectively. The savings in total energy due to fraction of air recycled were determined at 65 and 75°C air temperature for the above three airflow rates. The maximum saving in total energy up to 70.7% was achieved by recycling of the exhaust air. The energy required per unit mass of water removed was found between 12.040 and 38.777MJ/kg water. The percent energy contribution by the solar air heater, auxiliary heater, and blower was found between 22.4% and 40.9%, 33.6% and 62.6%, and 11.2% and 37.2%, respectively.

Suggested Citation

  • Sarsavadia, P.N., 2007. "Development of a solar-assisted dryer and evaluation of energy requirement for the drying of onion," Renewable Energy, Elsevier, vol. 32(15), pages 2529-2547.
    • Handle: RePEc:eee:renene:v:32:y:2007:i:15:p:2529-2547
    DOI: 10.1016/j.renene.2006.12.019
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    1. Fudholi, A. & Sopian, K. & Ruslan, M.H. & Alghoul, M.A. & Sulaiman, M.Y., 2010. "Review of solar dryers for agricultural and marine products," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 1-30, January.
    2. Yahya, M. & Rachman, Arfidian & Hasibuan, R., 2022. "Performance analysis of solar-biomass hybrid heat pump batch-type horizontal fluidized bed dryer using multi-stage heat exchanger for paddy drying," Energy, Elsevier, vol. 254(PB).
    3. Sharma, Atul & Chen, C.R. & Vu Lan, Nguyen, 2009. "Solar-energy drying systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(6-7), pages 1185-1210, August.
    4. VijayaVenkataRaman, S. & Iniyan, S. & Goic, Ranko, 2012. "A review of solar drying technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 2652-2670.
    5. Sandali, Messaoud & Boubekri, Abdelghani & Mennouche, Djamel & Gherraf, Noureddine, 2019. "Improvement of a direct solar dryer performance using a geothermal water heat exchanger as supplementary energetic supply. An experimental investigation and simulation study," Renewable Energy, Elsevier, vol. 135(C), pages 186-196.
    6. Tiwari, Sumit & Agrawal, Sanjay & Tiwari, G.N., 2018. "PVT air collector integrated greenhouse dryers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 90(C), pages 142-159.
    7. Boroze, Tchamye & Desmorieux, Hélène & Méot, Jean-Michel & Marouzé, Claude & Azouma, Yaovi & Napo, Kossi, 2014. "Inventory and comparative characteristics of dryers used in the sub-Saharan zone: Criteria influencing dryer choice," Renewable and Sustainable Energy Reviews, Elsevier, vol. 40(C), pages 1240-1259.
    8. EL-Mesery, Hany S. & EL-Seesy, Ahmed I. & Hu, Zicheng & Li, Yang, 2022. "Recent developments in solar drying technology of food and agricultural products: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 157(C).
    9. Lamnatou, Chr. & Papanicolaou, E. & Belessiotis, V. & Kyriakis, N., 2010. "Finite-volume modelling of heat and mass transfer during convective drying of porous bodies – Non-conjugate and conjugate formulations involving the aerodynamic effects," Renewable Energy, Elsevier, vol. 35(7), pages 1391-1402.
    10. Tandel, Hiren U. & Modi, Kalpesh V., 2022. "Experimental assessment of double-pass solar air heater by incorporating perforated baffles and solar water heating system," Renewable Energy, Elsevier, vol. 183(C), pages 385-405.
    11. Lingayat, Abhay Bhanudas & Chandramohan, V.P. & Raju, V.R.K. & Meda, Venkatesh, 2020. "A review on indirect type solar dryers for agricultural crops – Dryer setup, its performance, energy storage and important highlights," Applied Energy, Elsevier, vol. 258(C).
    12. Pietro Catania & Raimondo Gaglio & Santo Orlando & Luca Settanni & Mariangela Vallone, 2020. "Design and Implementation of a Smart System to Control Aromatic Herb Dehydration Process," Agriculture, MDPI, vol. 10(8), pages 1-19, August.
    13. Tiwari, Sumit & Tiwari, G.N. & Al-Helal, I.M., 2016. "Development and recent trends in greenhouse dryer: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 65(C), pages 1048-1064.
    14. Muhumuza, Ronald & Zacharopoulos, Aggelos & Mondol, Jayanta Deb & Smyth, Mervyn & Pugsley, Adrian, 2018. "Energy consumption levels and technical approaches for supporting development of alternative energy technologies for rural sectors of developing countries," Renewable and Sustainable Energy Reviews, Elsevier, vol. 97(C), pages 90-102.
    15. Pirasteh, G. & Saidur, R. & Rahman, S.M.A. & Rahim, N.A., 2014. "A review on development of solar drying applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 31(C), pages 133-148.
    16. Rashidi, Milad & Arabhosseini, Akbar & Samimi-Akhijahani, Hadi & Kermani, Ali M., 2021. "Acceleration the drying process of oleaster (Elaeagnus angustifolia L.) using reflectors and desiccant system in a solar drying system," Renewable Energy, Elsevier, vol. 171(C), pages 526-541.

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