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Theoretical Study on Steady Airflow through Multiple Upper Opennings inside a Rectangular Building in the Presence of Indirect Flow
| Communications on Applied Electronics |
| Foundation of Computer Science (FCS), NY, USA |
| Volume 7 - Number 14 |
| Year of Publication: 2018 |
| Authors: A. L. Muhammad, D. A. Gano, M. Z. Ringim, S. A. Ibrahim, A. B. Baffa |
10.5120/cae2018652757
|
A. L. Muhammad, D. A. Gano, M. Z. Ringim, S. A. Ibrahim, A. B. Baffa . Theoretical Study on Steady Airflow through Multiple Upper Opennings inside a Rectangular Building in the Presence of Indirect Flow. Communications on Applied Electronics. 7, 14 ( Mar 2018), 17-25. DOI=10.5120/cae2018652757
Abstract
The present paper is an extension of [2] work, in which, the study was concerned with an investigation of airflow through multiple upper vents in the presence of indirect flow, in which, the tendency of buoyancy force effect was strong due to the high temperature difference between interior and the ambient. A flow of this type represents a new class of boundary- layer flow problems in the building. Moreover, this is an exact solution of the complete Navier- Stokes Equations (including, buoyancy force term), which were then dimensionalised using some dimensionless parameters to reduce the Equations to ordinary differential Equations and then solved analytically by variation of parameter method and obtained the solutions, in which the behavior of parameters in the results were predicted the velocity, temperature profiles together with volumetric airflow and mass transfer. The results were then evaluated numerically for several sets of values of the parameters in order to ascertain the best for optimal ventilation. We performed comparison based on assume numerical values and parameter values of [2]. From the simulations in Figures 15-17, our Developed study is better and more efficient for ventilation. In conclusion, the main feature to be observed as the temperature changes increases the corresponding airflow is also increases this leads to the increase in velocity profiles. As the velocity of airflow increases the corresponding volumetric airflow is decreases, this leads to the increase in mass transfer in the building envelope. Therefore, the greater number of vertical vents in the building, and the greater temperature difference between the interior and exterior, the stronger is the effect of the buoyancy forces.
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