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Impact of roof shape on air pressure, wind flow and indoor temperature of residential buildings

Mahdavinejad, Mohammadjavad and Javanroodi, Kavan LU (2016) In Journal of Sustainable Building Technology & Urban Development 7(2). p.87-103
Abstract
The aim of this study is to investigate different roof shapes with respect to air flow and indoor temperature in order to find efficient roof shapes for residential buildings in Tehran, Iran. First, an analytical model is defined and then various roof types are modelled. Theoretical modelling is presented to assess the accuracy of the measurement procedures and the uncertainty of experimental modelling. Mathematical and computational field dynamics (CFD) modelling and simulation methods are applied; a κ-ε standard model and finite difference discretisation technique are used to simulate the velocity and pressure path lines as well as the temperature. The results indicate that the energy performance of a domed roof is more efficient... (More)
The aim of this study is to investigate different roof shapes with respect to air flow and indoor temperature in order to find efficient roof shapes for residential buildings in Tehran, Iran. First, an analytical model is defined and then various roof types are modelled. Theoretical modelling is presented to assess the accuracy of the measurement procedures and the uncertainty of experimental modelling. Mathematical and computational field dynamics (CFD) modelling and simulation methods are applied; a κ-ε standard model and finite difference discretisation technique are used to simulate the velocity and pressure path lines as well as the temperature. The results indicate that the energy performance of a domed roof is more efficient compared to flat, vaulted and pitched roofs. In the case of indoor temperature, a domed roof is about 8 K cooler. Also, the wind flow pattern around domed and pitched roofs is more complex; differences in the wind velocity and pressure are noticeable compared to the other roof types. It is concluded that roof geometry and shape has a major influence on reducing heat transfer and balancing roof temperature. (Less)
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author
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Roof shape, wind flow, indoor temperature, CFD, pressure coefficient
in
Journal of Sustainable Building Technology & Urban Development
volume
7
issue
2
pages
87 - 103
publisher
Taylor & Francis
external identifiers
  • scopus:2-s2.0-84992238305
ISSN
2093-761X
DOI
10.1080/2093761X.2016.1167645
language
English
LU publication?
no
id
fc8728e3-65bf-49ee-bfc4-1bd986bde5fc
date added to LUP
2018-06-14 12:39:14
date last changed
2020-07-29 05:14:24
@article{fc8728e3-65bf-49ee-bfc4-1bd986bde5fc,
  abstract     = {The aim of this study is to investigate different roof shapes with respect to air flow and indoor temperature in order to find efficient roof shapes for residential buildings in Tehran, Iran. First, an analytical model is defined and then various roof types are modelled. Theoretical modelling is presented to assess the accuracy of the measurement procedures and the uncertainty of experimental modelling. Mathematical and computational field dynamics (CFD) modelling and simulation methods are applied; a κ-ε standard model and finite difference discretisation technique are used to simulate the velocity and pressure path lines as well as the temperature. The results indicate that the energy performance of a domed roof is more efficient compared to flat, vaulted and pitched roofs. In the case of indoor temperature, a domed roof is about 8 K cooler. Also, the wind flow pattern around domed and pitched roofs is more complex; differences in the wind velocity and pressure are noticeable compared to the other roof types. It is concluded that roof geometry and shape has a major influence on reducing heat transfer and balancing roof temperature.},
  author       = {Mahdavinejad, Mohammadjavad and Javanroodi, Kavan},
  issn         = {2093-761X},
  language     = {eng},
  number       = {2},
  pages        = {87--103},
  publisher    = {Taylor & Francis},
  series       = {Journal of Sustainable Building Technology & Urban Development},
  title        = {Impact of roof shape on air pressure, wind flow and indoor temperature of residential buildings},
  url          = {http://dx.doi.org/10.1080/2093761X.2016.1167645},
  doi          = {10.1080/2093761X.2016.1167645},
  volume       = {7},
  year         = {2016},
}