Influence of Channel Depth on the Performance of Wavy Fin Absorber Solar Air Heater

Authors: Abhishek Priyam, Prabha Chand

Abstract:

Channel depth is an important design parameter to be fixed in designing a solar air heater. In this paper, a mathematical model has been developed to study the influence of channel duct on the thermal performance of solar air heaters. The channel depth has been varied from 1.5 cm to 3.5 cm for the mass flow range 0.01 to 0.11 kg/s. Based on first law of thermodynamics, the channel depth of 1.5 cm shows better thermal performance for all the mass flow range. Also, better thermohydraulic performance has been found up to 0.05 kg/s, and beyond this, thermohydraulic efficiency starts decreasing. It has been seen that, with the increase in the mass flow rate, the difference between thermal and thermohydraulic efficiency increases because of the increase in pressure drop. At lower mass flow rate, 0.01 kg/s, the thermal and thermohydraulic efficiencies for respective channel depth remain the same.

Keywords: Channel depth, thermal efficiency, wavy fin, thermohydraulic efficiency.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1340258

References:

[1] S. Vijaya VenkataRaman, S. Iniyan, and R. Goic, “A review of solar drying technologies,” Renewable Sustainable Energy Rev. 16, 2652–2670 (2012).
[2] A. Kumar, R. P. Saini, and J. S. Saini, “Heat and fluid flow characteristics of roughened solar air heater ducts—A review,” Renewable Energy 47, 77–94 (2012).
[3] V. V. Tyagi, A. K. Pandey, G. Giridhar, B. Bandyopadhyay, S. R. Park, and S. K. Tyagi, “Comparative study based on exergy analysis of solar air heater collector using thermal energy storage,” Int. J. Energy Res. 36, 724–736 (2012).
[4] S. Singh, S. Chander, and J. S. Saini, “Exergy based analysis of solar air heater having discrete V-down rib roughness on absorber plate,” Energy 37, 749–758 (2013).
[5] S. Bouadila, S. Kooli, M. Lazaar, S. Skouri, and A. Farhat, “Performance of a new solar air heater with packed-bed latent storage energy for nocturnal use,” Appl. Energy 110, 267–275 (2013).
[6] M. Sabzpooshani, K. Mohammadi, and H. Khorasanizadeh, “Exergetic performance evaluation of a single pass baffled solar air heater,” Energy 64, 697–706 (2014).
[7] F. Bayrek, H. F. Oztop, and A. Hepbasli, “Energy and exergy analyses of porous baffles inserted solar air heater for building applications,” Energy Build. 57, 338–345 (2013).
[8] D. Bahrehmand and M. Ameri, “Energy and exergy analysis of different solar air collector system with natural convection,” Renewable Energy 74, 357–368 (2015).
[9] S. Yadav, M. Kaushal, and S. Varun, “Exergetic performance evaluation of solar air heater having arc shape oriented protrusions as roughness element,” Sol. Energy 105, 181–189 (2014).
[10] N. P. Nwosu. Applied Solar energy 45, 248(2010).
[11] Donggen Peng, X. Zhang, H. Dong, and K. Lv. Applied Thermal Engineering 30,2594(2010).
[12] Priyam A., Chand P., (2016) "Thermal and thermohydraulic performance of wavy finned absorber solar air heater" Solar Energy;1;30:250-259.
[13] Priyam A., Chand P. (2016.) "Effect of collector aspect ratio on the thermal performance of wavy finned absorber solar air heater "International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering"10(5).
[14] J. A. Duffie and W. A. Beckman, Solar Engineering of Thermal Processes, 2nd ed. (John Wiley and Sons, New York, USA, 1991).
[15] Sheik Ismail L, Ranganayakulu C, Shah R. K., 2009. Numerical study of flow patterns of compact plate-fin heat exchangers and generation of design data for offset and wavy fins. International Journal of Heat and Mass Transfer. 52(17-18): 3972–3983.