Passive Cooling of Building by using Solar Chimney

Natural ventilation is an important means to improve indoor thermal comfort and reduce the energy consumption. A solar chimney system is an enhancing natural draft device, which uses solar radiation to heat the air inside the chimney, thereby converting the thermal energy into kinetic energy. The present study considered some parameters such as chimney width and solar intensity, which were believed to have a significant effect on space ventilation. Fluent CFD software was used to predict buoyant air flow and flow rates in the cavities. The results were compared with available published experimental and theoretical data from the literature. There was an acceptable trend match between the present results and the published data for the room air change per hour, ACH. Further, it was noticed that the solar intensity has a more significant effect on ACH.

• Insaf Mehani
• N. Settou

• Solar chimney
• numerical simulation

[1] L. Wang, and Li. Angui, A numerical Study of Trombe Wall for
Enhancing Stack Ventilation in Buildings [The 23th Conference on
Passive and Low Energie Architecture. Geneva, Switzerland, 6-8
[2] Hybrid Ventilation Annex35. IEA annual reports. Sydney, 2000.
[3] M.M. Padki, and S.A Sherif, On a simple analytical model for
solar chimneys," int. J. Energy Res, vol. 23, pp. 345-349,1999.
[4] NK. Bansal, R. Mathur, and MS. Bhandari, Solar Chimney for Enhanced
Stack Ventilation," Building and Environment pp. 373-377, 1993.
[5] J .Mathur, NK. Bansal, S. Mathur, M. Jain, and Anupma, "Experimental
investigations on Solar Chimney for Room Ventilation," Solar Energy,
Vol. 80, pp .927-935, 2006.
[6] Macias, A. Mateo, M. Schuler , and EM. Mitre, "Application of
Night Cooling Concept to Social Housing Design in Dry Hot Climate,"
Energy and Buildings, pp. 1104-1110, 2006.
[7] Matrti-Herrero and MR .Heras-Celemin" Dynamic Physical Model
for a Solar Chimney," Solar Energy, Vol. 81(5) , pp .614-622,2007 .
[8] J. Mathur, S. Mathur, and Anupma., "Summer-Performance of Inclined
Roof Solar Chimney for natural Ventillation Energy and Buildings,
Vol. 38, pp.1156-1163,2006
[9] Burek and A. Habib, " Air Flow and Thermal Efficiency in Solar
Chimneys and Trombe Walls, Energy and Buildings,Vol. 39(2), pp.
128-138,2007
[10] J. Mathur, Anupma, and S. Mathur, Experimental Investigation on
Four Different Types of Solar Chimneys," Advances in Energy Research
(AER); pp.151-156, 2006.
[11] R. Bassiouny, and N.S.A. Koura, "An Analytical and Numerical
Study of Solar Chimney use for Room Natural Ventilation ," Energy
and Buildings, pp. 1-21,2007.
[12] S.V. Patankar, Numerical Heat Transfer and Fluid Flow McGraw- Hill,
New York, 1980.
[13] N.C. Markatos, K.A. Pericleous, Laminar and turbulent natural
convection in an enclosed cavity, , Int. J. Heat Mass Transfer,Vol. 27