Identifying the Optimum Aspect Ratio of Windows in Small Commercial Buildings

Reza Foroughi, Somayeh Asadi, Soha Khazaeli

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the United States, 18% of total primary energy consumes in commercial buildings. Windows in commercial buildings are responsible for 35 and 28% of heating and cooling loads respectively and 32% of the total building energy consumption. Geometrical design parameters of the window have significant impact on the building energy consumption since they define the window dimensions which interact with the light rays. Aspect ratio, the ratio of the width to the length of the window, is one of the geometrical parameters which needs more investigation in terms of their impact on building heating and cooling loads and light energy consumption. The objective of this study is to determine the optimum aspect ratio of the window in small commercial buildings in order to make balance between heating and cooling loads and lighting energy use in seven different climate zones in the United States. Small commercial buildings (i.e., less than 50,000 ft2) are selected for this study because they represent 94% of U.S. commercial buildings. To achieve this objective, first, the Hill Climbing algorithm is used to develop an optimization model. The developed model is coupled with the Energy Plus software to simulate energy performance of the building. An office building is modeled as a case study and is simulated in seven different climate zones (climate zone 1-7) in the United States. Finally, the results are analyzed and compared with the baseline model to show the energy loads and lighting energy use of the buildings having optimum window aspect ratio. In addition, based on the simulation results, recommendations are made for the designers for each of the seven climate zones.

Original languageEnglish (US)
Title of host publicationConstruction Research Congress 2018
Subtitle of host publicationSustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018
EditorsYongcheol Lee, Rebecca Harris, Chao Wang, Christofer Harper, Charles Berryman
PublisherAmerican Society of Civil Engineers (ASCE)
Pages604-612
Number of pages9
ISBN (Electronic)9780784481301
DOIs
StatePublished - Jan 1 2018
EventConstruction Research Congress 2018: Sustainable Design and Construction and Education, CRC 2018 - New Orleans, United States
Duration: Apr 2 2018Apr 4 2018

Publication series

NameConstruction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018
Volume2018-April

Other

OtherConstruction Research Congress 2018: Sustainable Design and Construction and Education, CRC 2018
CountryUnited States
CityNew Orleans
Period4/2/184/4/18

Fingerprint

Aspect ratio
Energy utilization
Cooling
Heating
Lighting
Office buildings
Dynamic loads
Loads (forces)

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction

Cite this

Foroughi, R., Asadi, S., & Khazaeli, S. (2018). Identifying the Optimum Aspect Ratio of Windows in Small Commercial Buildings. In Y. Lee, R. Harris, C. Wang, C. Harper, & C. Berryman (Eds.), Construction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018 (pp. 604-612). (Construction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018; Vol. 2018-April). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784481301.060
Foroughi, Reza ; Asadi, Somayeh ; Khazaeli, Soha. / Identifying the Optimum Aspect Ratio of Windows in Small Commercial Buildings. Construction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018. editor / Yongcheol Lee ; Rebecca Harris ; Chao Wang ; Christofer Harper ; Charles Berryman. American Society of Civil Engineers (ASCE), 2018. pp. 604-612 (Construction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018).
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title = "Identifying the Optimum Aspect Ratio of Windows in Small Commercial Buildings",
abstract = "In the United States, 18{\%} of total primary energy consumes in commercial buildings. Windows in commercial buildings are responsible for 35 and 28{\%} of heating and cooling loads respectively and 32{\%} of the total building energy consumption. Geometrical design parameters of the window have significant impact on the building energy consumption since they define the window dimensions which interact with the light rays. Aspect ratio, the ratio of the width to the length of the window, is one of the geometrical parameters which needs more investigation in terms of their impact on building heating and cooling loads and light energy consumption. The objective of this study is to determine the optimum aspect ratio of the window in small commercial buildings in order to make balance between heating and cooling loads and lighting energy use in seven different climate zones in the United States. Small commercial buildings (i.e., less than 50,000 ft2) are selected for this study because they represent 94{\%} of U.S. commercial buildings. To achieve this objective, first, the Hill Climbing algorithm is used to develop an optimization model. The developed model is coupled with the Energy Plus software to simulate energy performance of the building. An office building is modeled as a case study and is simulated in seven different climate zones (climate zone 1-7) in the United States. Finally, the results are analyzed and compared with the baseline model to show the energy loads and lighting energy use of the buildings having optimum window aspect ratio. In addition, based on the simulation results, recommendations are made for the designers for each of the seven climate zones.",
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Foroughi, R, Asadi, S & Khazaeli, S 2018, Identifying the Optimum Aspect Ratio of Windows in Small Commercial Buildings. in Y Lee, R Harris, C Wang, C Harper & C Berryman (eds), Construction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018. Construction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018, vol. 2018-April, American Society of Civil Engineers (ASCE), pp. 604-612, Construction Research Congress 2018: Sustainable Design and Construction and Education, CRC 2018, New Orleans, United States, 4/2/18. https://doi.org/10.1061/9780784481301.060

Identifying the Optimum Aspect Ratio of Windows in Small Commercial Buildings. / Foroughi, Reza; Asadi, Somayeh; Khazaeli, Soha.

Construction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018. ed. / Yongcheol Lee; Rebecca Harris; Chao Wang; Christofer Harper; Charles Berryman. American Society of Civil Engineers (ASCE), 2018. p. 604-612 (Construction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018; Vol. 2018-April).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Foroughi R, Asadi S, Khazaeli S. Identifying the Optimum Aspect Ratio of Windows in Small Commercial Buildings. In Lee Y, Harris R, Wang C, Harper C, Berryman C, editors, Construction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018. American Society of Civil Engineers (ASCE). 2018. p. 604-612. (Construction Research Congress 2018: Sustainable Design and Construction and Education - Selected Papers from the Construction Research Congress 2018). https://doi.org/10.1061/9780784481301.060