External perforated window Solar Screens: The effect of screen depth and perforation ratio on energy performance in extreme desert environments

Handle URI:
http://hdl.handle.net/10754/598298
Title:
External perforated window Solar Screens: The effect of screen depth and perforation ratio on energy performance in extreme desert environments
Authors:
Sherif, A.; El-Zafarany, A.; Arafa, R.
Abstract:
In hot arid desert environments, the solar radiation passing through windows increases the cooling loads and the energy consumption of buildings. Shading of windows can reduce these loads. Unlike the woven solar screens, wooden solar screens have a thickness that provides selective shading properties. Perforated wooden solar screens were traditionally used for windows shading. Developing modern types of these shading systems can lead to significant energy savings. The paper addresses the influence of changing the perforation percentage and depth of these screens on the annual energy loads, hence defining the optimum depth/perforation configurations for various window orientations. Series of experiments were performed using the EnergyPlus simulation software for a typical residential building in the Kharga Oasis, located in the Egyptian desert. A range of perforation percentages and depths were tested. Conclusions prove that external fixed deep perforated solar screens could effectively achieve energy savings up to 30% of the total energy consumption in the West and South orientations. Optimum range of depths and perforation percentages were recommended. These are: 80-90% perforation rate and 1:1 depth/opening width ratio. These lighter and deeper solar screen configurations were found to be more efficient in energy consumption in comparison with the traditional ones. © 2012 Elsevier B.V. All rights reserved.
Citation:
Sherif A, El-Zafarany A, Arafa R (2012) External perforated window Solar Screens: The effect of screen depth and perforation ratio on energy performance in extreme desert environments. Energy and Buildings 52: 1–10. Available: http://dx.doi.org/10.1016/j.enbuild.2012.05.025.
Publisher:
Elsevier BV
Journal:
Energy and Buildings
KAUST Grant Number:
C0015
Issue Date:
Sep-2012
DOI:
10.1016/j.enbuild.2012.05.025
Type:
Article
ISSN:
0378-7788
Sponsors:
This publication is based on work supported by Award No. C0015 made by King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorSherif, A.en
dc.contributor.authorEl-Zafarany, A.en
dc.contributor.authorArafa, R.en
dc.date.accessioned2016-02-25T13:18:14Zen
dc.date.available2016-02-25T13:18:14Zen
dc.date.issued2012-09en
dc.identifier.citationSherif A, El-Zafarany A, Arafa R (2012) External perforated window Solar Screens: The effect of screen depth and perforation ratio on energy performance in extreme desert environments. Energy and Buildings 52: 1–10. Available: http://dx.doi.org/10.1016/j.enbuild.2012.05.025.en
dc.identifier.issn0378-7788en
dc.identifier.doi10.1016/j.enbuild.2012.05.025en
dc.identifier.urihttp://hdl.handle.net/10754/598298en
dc.description.abstractIn hot arid desert environments, the solar radiation passing through windows increases the cooling loads and the energy consumption of buildings. Shading of windows can reduce these loads. Unlike the woven solar screens, wooden solar screens have a thickness that provides selective shading properties. Perforated wooden solar screens were traditionally used for windows shading. Developing modern types of these shading systems can lead to significant energy savings. The paper addresses the influence of changing the perforation percentage and depth of these screens on the annual energy loads, hence defining the optimum depth/perforation configurations for various window orientations. Series of experiments were performed using the EnergyPlus simulation software for a typical residential building in the Kharga Oasis, located in the Egyptian desert. A range of perforation percentages and depths were tested. Conclusions prove that external fixed deep perforated solar screens could effectively achieve energy savings up to 30% of the total energy consumption in the West and South orientations. Optimum range of depths and perforation percentages were recommended. These are: 80-90% perforation rate and 1:1 depth/opening width ratio. These lighter and deeper solar screen configurations were found to be more efficient in energy consumption in comparison with the traditional ones. © 2012 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipThis publication is based on work supported by Award No. C0015 made by King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.subjectDepthen
dc.subjectDeserten
dc.subjectEgypten
dc.subjectEnergyen
dc.subjectPerforationen
dc.subjectShadingen
dc.subjectSolar Screenen
dc.subjectWindowen
dc.titleExternal perforated window Solar Screens: The effect of screen depth and perforation ratio on energy performance in extreme desert environmentsen
dc.typeArticleen
dc.identifier.journalEnergy and Buildingsen
dc.contributor.institutionAmerican University in Cairo, Cairo, Egypten
dc.contributor.institutionCairo University, Cairo, Egypten
kaust.grant.numberC0015en
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