05.2020.436.450

Numerical investigation for natural ventilation enhancement in different models of solar chimney inside a room elicited from the concepts of the conventional chimney model

Author(s):
Hisham S. Hashim, Muna S. Kassim, Husam H. Kadhim

Affiliation(s):

Mechanical Engineering Department, College of Engineering, Mustansiriyah University, Baghdad, Iraq

Ministry of Higher Education and Scientific Research

Corresponding Author Email: Mschishamsaed@gmail.com

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

This work was carried out to investigate the effect of the chimney model from natural ventilation and thermal room condition. Three-dimensional and quasi-steady computational fluid dynamicswas designed to predict the temperature of air inside the room, the incident solar radiation, and the buoyant air flow by using the standard k-ε turbulence model. The optimized room chimney model, which is used by several researchers, was modified by increasing the length of the chimney with the same absorber surface area. Moreover, the effect of adding more window to the room was investigated. The standard model was validated with the numerical data obtained from the literature. The investigation clarified that the solar radiation that is fallen on the room floor and the roof has the worst effect onraising the room temperature. Extending the chimney length has shown an excellenteffect in blocking the solar radiation to the undesired position and also increase the ventilation rate. The inclined and vertical extended chimneys have increased the ventilation rate by 7.5% and 13%, respectively, as compared with a conventional chimney model. The addition of another window in the room has induced more air movement resulting in decreasing the hot air inside the room. Thus, the difference between the average air room and the ambient air temperature was 3°C, and the ventilation rate increased by 39%.