Hybrid-Model Simulations to Equilibrate Energy Demand and Daylight Autonomy as a Function of Window-to-Wall Ratio and Orientation For a Perimeter Office in Izmir

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Hybrid-Model Simulations to Equilibrate Energy Demand and Daylight Autonomy as a Function of Window-to-Wall Ratio and Orientation For a Perimeter Office in Izmir [Megaron]

Megaron. 2020; 15(4): 537-552 | DOI: 10.14744/megaron.2020.42223

Hybrid-Model Simulations to Equilibrate Energy Demand and Daylight Autonomy as a Function of Window-to-Wall Ratio and Orientation For a Perimeter Office in Izmir

Hakan Ba�¹, Tu�ce Kazanasmaz²
¹Department of Architecture, �zmir Katip �elebi University Faculty of Engineering and Architecture, �zmir, Turkey
²Department of Architecture, �zmir Institute of Technology Faculty of Architecture, �zmir, Turkey

This study is based on integrated thermal-lighting simulations to find the optimal value of the window-to-wall ratio (WWR) for a perimeter, single-zone office to equilibrate daylight autonomy and overall energy demand in the climate of Izmir, Turkey. A hybrid model approach has been adopted that combines thermal and lighting calculations in a single model via the IES <VE> software. The optimal WWRs to achieve the highest possible daylight benefit and lowest overall energy use at the same time has been found to have 30% WWR in the South and West, 40% WWR in the East and 60% WWR in the North. These WWR values trade-off daylight benefit, total energy consumption for lighting, heating, and cooling, and visual comfort compared to larger and smaller WWR options. Since the daylight use can significantly reduce artificial lighting energy consumption as long as WWR increases, the energy benefit from lighting reaches 79% as a function of daylight for the South case at 30% optimal WWR. The strongest effect of cooling demand is evident in the breakdown of energy consumption and the amount of glazing is the dominant factor defining the cooling demand. The implications of this study can help architects get feedback on how to save energy for each final energy use (heating, cooling, and lighting) reduction in window space and convey this message to their designs with suggested optimal WWR values.

Keywords: Daylight autonomy, daylighting; energy use; visual comfort; window-to-wall ratio.

�zmir�de Tek Hacimli Bir Ofisin Enerji Yükü ve Gün I�� Otonomisini Dengelemek ��in Pencere-Duvar Oran� ve Y�nelimine Ba�l� Olarak Ger�ekle�tirilen Hibrit-Model Simülasyonlar�

Hakan Ba�¹, Tu�ce Kazanasmaz²
¹Mimarl�k B�l�m�, �zmir Katip �elebi �niversitesi, �zmir, T�rkiye
²Mimarl�k B�l�m�, �zmir Y�ksek Teknoloji Enstit�s�, �zmir, T�rkiye

Bu �al��ma, �zmir iline ait iklim ko�ullar� ba�lam�nda tek hacimli bir ofisin gün �� otonomisini ve toplam enerji yükünü dengelemek i�in optimum pencere-duvar oran�n� (PDO) bulmak i�in yap�lan entegre termal-ayd�nlatma simülasyonlar�na dayanmaktad�r. IES<VE> yaz�l�m�yla termal ve ayd�nlatma hesaplar�n� bir modelde birle�tiren �hibrit model� yakla��m� benimsenmi�tir. Olas� en yüksek gün �� faydas� ve en dü�ük toplam enerji tüketimini sa�lamak i�in en uygun pencere-duvar oran� de�erleri s�ras�yla güney ve bat�da %30, do�uda %40 ve kuzeyde %60 olarak bulunmu�tur. Bulunan pencere-duvar oran� de�erleri gün ��ndan yararlanmay� ve g�rsel konforu sa�larken, ayd�nlatma, �s�tma ve so�utma i�in genel enerji tüketimini daha büyük ve daha kü�ük pencere-duvar oran� alternatiflerine g�re daha iyi dengelemektedir. Pencere duvar oran� artt��nda artan gün �� miktar�, yapay ayd�nlatma enerji tüketimini �nemli �l�üde azaltmakta ve ayd�nlatma enerjisi kazanc�, güney cephede optimum %30 pencere-duvar oran� i�in %79�a kadar ula�maktad�r. Enerji tüketimi analizinde so�utma talebinin gü�lü etkisi a��k�a g�rülmektedir ve pencere alan� so�utma talebini belirleyen en �nemli etkendir. Bu �al��mada ortaya ��kan sonu�lar, pencere alan�ndaki azalman�n her bir enerji kullan�m�nda (�s�tma, so�utma ve ayd�nlatma) ne kadar enerji tasarrufu sa�lad��na dair mimarlar�n geri bildirim almalar�na ve �nerilen optimum pencere-duvar oran� de�erlerinin tasar�ma aktar�lmas�na yard�m etmektedir.

Anahtar Kelimeler: Gü, n �� otonomisi; do�al ayd�nlatma; enerji kullan�m�; g�rsel konfor; pencere-duvar oran�.

Hakan Ba�, Tu�ce Kazanasmaz. Hybrid-Model Simulations to Equilibrate Energy Demand and Daylight Autonomy as a Function of Window-to-Wall Ratio and Orientation For a Perimeter Office in Izmir. Megaron. 2020; 15(4): 537-552

Corresponding Author: Hakan Ba�, T�rkiye

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