ÇATI GEOMETRİSİN BİNA ISIL DAVRANIŞI ÜZERİNDEKİ ETKİSİNİN İNCELENMESİ

Yıl 2017, Cilt: 22 Sayı: 3, 187 - 200, 28.12.2017

Erdal Yıldırım Zeynel Abidin Fıratoğlu Bülent Yeşilata

https://doi.org/10.17482/uumfd.330923

Öz

Bu
çalışmanın amacı yaz ayları için enerji verimliliği açısından, bina çatı
geometrisinin iç ortam havasına etkisini araştırmaktır. Bu amaçla Harran konik
çatılı yapıları aynı taban alanı, hacim ve termo-fiziksel özelliklere sahip düz
çatılı bina ile karşılaştırılmıştır. k-ε türbülans modeli kullanılarak üç
boyutlu CFD simülasyonu gerçekleştirilmiştir. Çatı geometrisinin doğal
havalandırmaya etkisi araştırılmıştır. Bu kapsamda çapraz havalandırma debisi
ve taşınım ısı transfer katsayıları değerlendirilmiştir. Harran evi çapraz
havalandırma açısından düz çatılı yapıya göre % 8 daha iyi performans
göstermektedir.  Sayısal analizler
sonucundan tipik bir yaz günü için Harran evinin kubbesinin düz çatıdan % 30
daha az ısı atağına maruz kaldığı ve bunun daha düşük iç ortam havası
sıcaklığına neden olduğu ortaya çıkmıştır.

Anahtar Kelimeler

Harran evi, Çatı geometrisi, Isıl performans, Doğal havalandırma

Investigation of the Effect of the Roof Geometry on Building Thermal Behaviour

Öz

Main objective of this study is to investigate
effect of the roof geometry on indoor air conditions in terms of energy
efficiency in summer. Harran’s conical roofed building has for this purpose
been compared with flat roofed building of equivalent thermo-physical
properties, base area and volume. Three dimensional CFD simulations using the
low-Reynolds number modeling (LRNM) and standard  turbulence models are performed. The effect of
roof geometry on natural ventilation is investigated. Cross ventilation flow
rates and convection heat transfer coefficients for these two roof types are
evaluated for this purpose. Cross ventilation flow rate for the house with
conical roof is found to be 8% higher than that of the flat one. The result of
the numerical analysis reveals as well that the conical roof transfers 30% less
heat to interior side for a representative summer day, resulting in lower
indoor air temperature in the house.  

Anahtar Kelimeler

Harran house, Roof geometry, Thermal performance, Natural ventilation, Convection heat transfer coefficient

Kaynakça

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