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Reducing cooling demands in a hot dry climate: A simulation study for non-insulated passive cool roof thermal performance in residential buildings

Dabaieh, Marwa LU ; Wanas, Omar; Amer Hegazy, Mohamed and Johansson, Erik LU (2015) In Energy and Buildings 89. p.142-152
Abstract
In hot dry climates, it is estimated that almost half the urban peak load of energy consumption is used to satisfy air-conditioning cooling demands in summer time. Since the urbanization rate in developing countries – like the case in Egypt – is rising rapidly, the pressure placed on energy resources to satisfy inhabitants’ indoor comfort requirements is consequently increasing too. This paper introduces passive cool roof as a means of reducing energy cooling loads for satisfying human comfort requirements in a hot climate. A designed algorithmic hybrid matrix was used to simulate 37 roof design probabilities alternating roof shape, roof material and construction. The result of using a vault roof with high albedo coating shows a fall of... (More)
In hot dry climates, it is estimated that almost half the urban peak load of energy consumption is used to satisfy air-conditioning cooling demands in summer time. Since the urbanization rate in developing countries – like the case in Egypt – is rising rapidly, the pressure placed on energy resources to satisfy inhabitants’ indoor comfort requirements is consequently increasing too. This paper introduces passive cool roof as a means of reducing energy cooling loads for satisfying human comfort requirements in a hot climate. A designed algorithmic hybrid matrix was used to simulate 37 roof design probabilities alternating roof shape, roof material and construction. The result of using a vault roof with high albedo coating shows a fall of 53% in discomfort hours and saves 826 kW h during the summer season compared to the base case of the conventional non insulated flat roof in a typical Cairo residential buildings. It is recommended that the selected cool roof solution be combined with natural ventilation to increase the indoor thermal comfort, and with passive heating strategies to compensate the increase in heating hours. The application is intended for low cost residential buildings in a hot dry climate. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Passive cooling, Cool roof, Thermal performance, Energy efficient roofs, Energy loads, Cooling demand, Hot dry climate
in
Energy and Buildings
volume
89
pages
142 - 152
publisher
Elsevier
external identifiers
  • wos:000350706400014
  • scopus:84921385575
ISSN
1872-6178
DOI
10.1016/j.enbuild.2014.12.034
language
English
LU publication?
yes
id
c2171489-a8f4-470d-89bd-ad16fb4ec11a (old id 4936408)
date added to LUP
2015-02-09 14:23:15
date last changed
2017-09-10 03:05:25
@article{c2171489-a8f4-470d-89bd-ad16fb4ec11a,
  abstract     = {In hot dry climates, it is estimated that almost half the urban peak load of energy consumption is used to satisfy air-conditioning cooling demands in summer time. Since the urbanization rate in developing countries – like the case in Egypt – is rising rapidly, the pressure placed on energy resources to satisfy inhabitants’ indoor comfort requirements is consequently increasing too. This paper introduces passive cool roof as a means of reducing energy cooling loads for satisfying human comfort requirements in a hot climate. A designed algorithmic hybrid matrix was used to simulate 37 roof design probabilities alternating roof shape, roof material and construction. The result of using a vault roof with high albedo coating shows a fall of 53% in discomfort hours and saves 826 kW h during the summer season compared to the base case of the conventional non insulated flat roof in a typical Cairo residential buildings. It is recommended that the selected cool roof solution be combined with natural ventilation to increase the indoor thermal comfort, and with passive heating strategies to compensate the increase in heating hours. The application is intended for low cost residential buildings in a hot dry climate.},
  author       = {Dabaieh, Marwa and Wanas, Omar and Amer Hegazy, Mohamed and Johansson, Erik},
  issn         = {1872-6178},
  keyword      = {Passive cooling,Cool roof,Thermal performance,Energy efficient roofs,Energy loads,Cooling demand,Hot dry climate},
  language     = {eng},
  pages        = {142--152},
  publisher    = {Elsevier},
  series       = {Energy and Buildings},
  title        = {Reducing cooling demands in a hot dry climate: A simulation study for non-insulated passive cool roof thermal performance in residential buildings},
  url          = {http://dx.doi.org/10.1016/j.enbuild.2014.12.034},
  volume       = {89},
  year         = {2015},
}