Natural Convection of Air through an Asymmetrically Heated Vertical Channel with a Baffle

Abstract:

The buoyancy-induced air flow through a two-dimensional vertical ventilation channel is calculated. One of the channel walls is heated uniformly, and the other wall is adiabatic. A thin baffle is placed on the heated wall to manipulate the air flow through the channel. Numerical results are obtained for baffles of different lengths and placed at various heights along the heated wall. It is found that the baffle is effective in weakening a reverse flow at the exit of the channel, and significant enhancement of ventilation performance may be achieved with the presence of the baffle.

• Periodical: Applied Mechanics and Materials (Volume 846)
• Pages: 7-11
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.846.7
• Online since: July 2016
• Authors: Cheng Wang Lei*, Tuo Tian Wang
• Keywords: Baffle, Natural Convection, Ventilation, Vertical Channel

References

[1] R. Khanal, C. Lei, Solar chimney – A passive strategy for natural ventilation, Energy & Buildings, 43(2011) 1811–1819.

DOI: 10.1016/j.enbuild.2011.03.035

[2] N.K. Bansal, R. Mathur, M.S. Bhandari, Solar chimney for enhanced stack ventilation, Building & Environment, 28(1993) 373-377.

DOI: 10.1016/0360-1323(93)90042-2

[3] J. Mathur, N.K. Bansal, S. Mathur, M. Jain, S. Anupma, Experimental investigations on solar chimney for room ventilation. Solar Energy, 80(2006) 927–935.

DOI: 10.1016/j.solener.2005.08.008

[4] D.J. Harris, N. Helwig, Solar chimney and building ventilation, Applied Energy, 84(2007) 135-146.

DOI: 10.1016/j.apenergy.2006.07.001

[5] X.Q. Zhai, Z.P. Song, R.Z. Wang, A review for the applications of solar chimneys in buildings, Renewable & Sustainable Energy Reviews, 15(2011) 3757–3767.

DOI: 10.1016/j.rser.2011.07.013

[6] G. Gan, S.B. Riffat, A numerical study of solar chimney for natural ventilation of buildings with heat recovery, Applied Thermal Engineering, 18(1998) 1171-1187.

DOI: 10.1016/s1359-4311(97)00117-8

[7] Z.D. Chen, P. Bandopadhayay, J. Halldorsson, C. Byrjalsen, P. Heiselberg, Y. Li, An experimental investigation of a solar chimney model with uniform wall heat flux, Building & Environment, 38(2003) 893-906.

DOI: 10.1016/s0360-1323(03)00057-x

[8] R. Khanal, C. Lei, Flow reversal effects on buoyancy induced air flow in a solar chimney, Solar Energy, 86(2012) 2783-2794.

DOI: 10.1016/j.solener.2012.06.015

[9] R. Khanal, C. Lei, An experimental investigation of an inclined passive wall solar chimney for natural ventilation, Solar Energy, 107(2014) 461-474.

DOI: 10.1016/j.solener.2014.05.032

[10] S.V. Patankar, Numerical Heat Transfer and Fluid Flow, Hemisphere, New York, (1980).