Ventilation is air circulation inside a building. Two main approaches can be applied for building ventilation: (1) a fan is used to drive the airflow, and (2) natural convection due to temperature difference is used to drive the airflow. The cost of electricity on ventilation is significant, especially when it is considered together with space cooling. The second approach can take advantage of the renewable resource such as solar energy to lower energy cost. This paper presents a numerical model to investigate the solar chimney performance. Several configurations of solar chimney are examined in this study to predict the ventilation of the building. The commercial software package, Fluent, is adopted. The effect of solar chimney height, air gap width as well as the brick width is investigated. It is found that the flow rate increases by 100% as the chimney height increases from 1.5 to 3 m, while the air gap width has much smaller influence. It also shows that the solar chimney works for different seasons although the solar radiation changes significantly. In addition, using an unsteady state model, it can be observed that the chimney with 0.3 m thick brick wall can work the whole day even in the night. It is expected that this research can help design the solar chimney in a better way.
- Heat Transfer Division
Numerical Study on Performance of Solar Chimney for Building Ventilation
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Su, C, & Li, X. "Numerical Study on Performance of Solar Chimney for Building Ventilation." Proceedings of the ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1: Heat Transfer in Energy Systems; Theory and Fundamental Research; Aerospace Heat Transfer; Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat and Mass Transfer in Biotechnology; Environmental Heat Transfer; Visualization of Heat Transfer; Education and Future Directions in Heat Transfer. Rio Grande, Puerto Rico, USA. July 8–12, 2012. pp. 1049-1055. ASME. https://doi.org/10.1115/HT2012-58498
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