Abstract:
Characteristics of efficient roof shape is a part of configuration of efficient architecture which seems to be an ideal in contemporary architecture especially in contemporary architecture of developing countries such as Iran. This study is to investigate two roof shapes in view of air flow and indoor-temperature to find efficient roofs shapes for residential buildings in Tehran. Computational modeling and simulation methods are applied to reach this purpose. A mathematical modeling along with CFD simulation by Fluent Software is used to determine variables. For simulating velocity and pressure path lines κ-ε standard model and finite difference discretization technique is applied. Results show that a sample room with dome roof is about eight Kelvin degree cooler than the same room with flat roof. Also velocity and pressure simulations indicate that roof geometry has a major impact on reducing heat transfer of room and roof temperature. Finally the study suggests some methods for using results in an operational situation.
Machine summary:
Efficient Roof Shapes through Wind Flow and Indoor Temperature, Case Studies: Flat Roofs and Domed Roofs Mohammadjavad Mahdavinejad1* and Kavan Javanroodi2 1Assistant Professor, Department of Architecture, Faculty of Art and Architecture, Tarbiat Modares University, Tehran, Iran.
This study is to investigate two roof shapes in view of air flow and indoor-temperature to find efficient roofs shapes for residential buildings in Tehran.
This paper aims to investigate efficient roof shapes via wind flow and indoor temperature which focused on flat roofs and domed roofs as case studies of the research.
(2005), Faghih and Bahadori (2009) investigated air flow over domed roof buildings experimentally and Mahdavinejad et al.
In this paper, a first attempt is made to calculate pressure coefficient, air flow and wind pressure around domed and flat roofs based on solar geometry and two dimensional equations.
RESULTS AND DISCUSSION Figures 3 and 4 are showing wind velocity around flat and domed roof according to climatic data on table 2.
This value once again shows larger pressure coefficient difference at the domed roof compare to flat roof which can increase coolness of the roof at the day time and consequently reduces indoor temperature which is the main purpose of the study.
CONCLUTION Analysis in this study indicates that a non-opening sample room with a domed roof, irrespective of building’s type, has lower indoor air temperatures as compared to those with a flat roof during the daytime under the typical hot dry climate condition, just as many researchers claimed and observed in the past.
Three Dimensional Numerical Investigation of Air Flow Over Domed Roofs, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 98, 161–168 Faghih Khorasani, A.