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Parametric study of a solar air heater with and without thermal storage for solar drying applications

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  • Aboul-Enein, S.
  • El-Sebaii, A.A.
  • Ramadan, M.R.I.
  • El-Gohary, H.G.

Abstract

A transient analytical model is presented for a flat-plate solar air heater with and without thermal storage. The flowing air temperature is assumed to vary with time and space coordinates. Analytical expressions are obtained for various temperatures of the air heater elements as well as for the temperature of the storage material. The performance of the air heater is investigated by computer simulation using the climatic conditions of Tanta (Lat. 30° 47′ N, Egypt). Effects of design parameters of the air heater such as length (L), width (b), gap spacing between the absorber plate and glass cover (df), mass flow rate (ṁ) and thickness and type of the storage material (sand, granite and water) on the outlet and average temperatures of the flowing air are studied. It is found that as L and b increase the average temperature of flowing air (Tfav) increases up to typical values for these parameters. Typical values for L and b are obtained as 3 and 2 m, respectively. The outlet temperature (Tfo) of flowing air is found to decrease with increasing gap spacing and mass flow rate of air. Improvements in the heater performance with storage have been achieved at the optimum thickness (0.12 m) of the storage material. Therefore, the air heater can be used as a heat source for drying agricultural products and the drying process will continue during night, instead of re-absorption of moisture from the surrounding air. Comparisons between experimental and theoretical results indicated that the proposed mathematical model can be used for estimating the thermal performance of flat-plate solar air heaters with reasonable accuracy.

Suggested Citation

  • Aboul-Enein, S. & El-Sebaii, A.A. & Ramadan, M.R.I. & El-Gohary, H.G., 2000. "Parametric study of a solar air heater with and without thermal storage for solar drying applications," Renewable Energy, Elsevier, vol. 21(3), pages 505-522.
    • Handle: RePEc:eee:renene:v:21:y:2000:i:3:p:505-522
    DOI: 10.1016/S0960-1481(00)00092-6
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    Citations

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    Cited by:

    1. Kabeel, A.E. & Hamed, Mofreh H. & Omara, Z.M. & Kandeal, A.W., 2017. "Solar air heaters: Design configurations, improvement methods and applications – A detailed review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 70(C), pages 1189-1206.
    2. 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.
    3. Murthy, M.V. Ramana, 2009. "A review of new technologies, models and experimental investigations of solar driers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(4), pages 835-844, May.
    4. Flores-Irigollen, A. & Fernández, J.L. & Rubio-Cerda, E. & Poujol, F.T., 2004. "Heat transfer dynamics in an inflatable-tunnel solar air heater," Renewable Energy, Elsevier, vol. 29(8), pages 1367-1382.
    5. Jain, Dilip & Tewari, Pratibha, 2015. "Performance of indirect through pass natural convective solar crop dryer with phase change thermal energy storage," Renewable Energy, Elsevier, vol. 80(C), pages 244-250.
    6. El-Sebaii, A.A. & Aboul-Enein, S. & Ramadan, M.R.I. & El-Gohary, H.G., 2002. "Empirical correlations for drying kinetics of some fruits and vegetables," Energy, Elsevier, vol. 27(9), pages 845-859.
    7. Bal, Lalit M. & Satya, Santosh & Naik, S.N., 2010. "Solar dryer with thermal energy storage systems for drying agricultural food products: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(8), pages 2298-2314, October.
    8. 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.
    9. Saxena, Abhishek & Srivastava, Ghanshyam & Tirth, Vineet, 2015. "Design and thermal performance evaluation of a novel solar air heater," Renewable Energy, Elsevier, vol. 77(C), pages 501-511.
    10. Khouya, Ahmed, 2020. "Effect of regeneration heat and energy storage on thermal drying performance in a hardwood solar kiln," Renewable Energy, Elsevier, vol. 155(C), pages 783-799.
    11. Saxena, Abhishek & Varun, & El-Sebaii, A.A., 2015. "A thermodynamic review of solar air heaters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 863-890.
    12. Dake, Rock Aymar & N’Tsoukpoe, Kokouvi Edem & Kuznik, Frédéric & Lèye, Babacar & Ouédraogo, Igor W.K., 2021. "A review on the use of sorption materials in solar dryers," Renewable Energy, Elsevier, vol. 175(C), pages 965-979.
    13. Tchinda, Réné, 2009. "A review of the mathematical models for predicting solar air heaters systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(8), pages 1734-1759, October.
    14. Wang, Yang & Li, Heping & Ortega-Fernández, Iñigo & Huang, Xuefeng & Jiang, Bo & Bielsa, Daniel & Palomo, Elena, 2021. "The time-varying radiation applied in the temperature-sensitive reaction system stabilized with heat storage technology," Applied Energy, Elsevier, vol. 283(C).
    15. 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).
    16. Benjamin O. Ezurike & Muhammad Abid & Stephen A. Ajah & Chukwunenye A. Okoronkwo & Humphrey Adun & Udora N. Nwawelu & Olusola Bamisile & Juliana Hj Zaini, 2023. "Design and Numerical Energetic Analysis of a Novel Semi-Automated Biomass-Powered Multipurpose Dryer," Sustainability, MDPI, vol. 15(8), pages 1-14, April.
    17. Gilago, Mulatu C. & V.P., Chandramohan, 2022. "Performance parameters evaluation and comparison of passive and active indirect type solar dryers supported by phase change material during drying ivy gourd," Energy, Elsevier, vol. 252(C).
    18. Das, Biplab & Mondol, Jayanta Deb & Negi, Sushant & Smyth, Mervyn & Pugsley, Adrian, 2021. "Experimental performance analysis of a novel sand coated and sand filled polycarbonate sheet based solar air collector," Renewable Energy, Elsevier, vol. 164(C), pages 990-1004.
    19. Abuşka, Mesut & Şevik, Seyfi & Kayapunar, Arif, 2019. "Comparative energy and exergy performance investigation of forced convection solar air collectors with cherry stone/powder," Renewable Energy, Elsevier, vol. 143(C), pages 34-46.
    20. El-Sebaii, A.A. & Al-Snani, H., 2010. "Effect of selective coating on thermal performance of flat plate solar air heaters," Energy, Elsevier, vol. 35(4), pages 1820-1828.
    21. Kalaiarasi, G. & Velraj, R. & Vanjeswaran, M.N. & Ganesh Pandian, N., 2020. "Experimental analysis and comparison of flat plate solar air heater with and without integrated sensible heat storage," Renewable Energy, Elsevier, vol. 150(C), pages 255-265.
    22. Alkilani, Mahmud M. & Sopian, K. & Alghoul, M.A. & Sohif, M. & Ruslan, M.H., 2011. "Review of solar air collectors with thermal storage units," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(3), pages 1476-1490, April.

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