Balkonlarda oluşan ısı köprülerinin bina enerji performansına olan etkilerinin incelenmesi

Depletion of fossil fuels, increasing energy prices and carbon emissions are high- lightened need for energy efficiency. Recently, countries develop their own energy codes and standards day by day. Green energy technologies, sustainable solutions and energy efficiency are preferred. Public policies and voluntary agreements are for people to consume low energy. With regard to their operation times, buildings account a considerable amount of energy consumption. In Turkey, most of buildings consume more energy than European countries. Lack of insulation on building envelope leads to an increasing pattern in energy consumptions as well as inaccurate commissioning process and imprecise life cycle cost assessments among many other related aspects. Thermal bridge issues generally not considered during design, construction and retrofitting phases. However, thermal bridges accounts significant role on overall energy consumption in building. Thermal bridges could occur different part of buildings such as roof, internal floor, pillar, ground floor and balcony. Through a building's life cycle thermal bridges effect energy consumption, durability and indoor environmental quality of building. Unwanted heat transfer leads to increase in energy consumption. Thermal bridge surfaces have lower temperature than indoor ambient temperatures. This situation may causes condensation in surface or in wall. Thus, durability of construction decreases. Furthermore, condensation on indoor surfaces effects moisture level and fungi grow in indoor spaces. Undesired indoor air quality may lead to decrease in comfort, worker performance. Moreover indoor air directly effects the health. In this study, balcony thermal bridges are investigated in terms of energy consumption also, surface condensation potential is assessed on the basis of surface temperature factor calculation. In order to conduct a thermal bridge study, an uninsulated two story residential building is selected where is located in Manisa Province. Base on building data, two dimensional heat transfer simulations are performed with Therm software. Therm outputs are derived to overall U value and these values are inputted into the eQuest software. Effects of thermal bridges are examined through a building energy model. Three case studies are developed as following; Case -1 : Existing condition (uninsulated), Case -2 :Exterior wall insulated condition, Case -3 : Exterior wall and balcony slab insulated condition. With the application of insulation layer to exterior wall (Case-2), heating energy consumption decreased by 48.8% also, cooling energy decreased by 22.3% compared to the existing case. With the insulation of exterior wall and balcony slab (Case-3), heating energy consumption decreased by 4.4% and cooling energy consumption decreased by 0.8% compared to case-2.