TY - JOUR
TI - Energy consumption and CO2 emission reductions trough refurbishment of residential buildings’ roofs by applying the green roof system: Case study
AU - Đorđević Katarina T
AU - Joksimović Olja D
AU - Jovanović-Popović Milica Đ
JN - Thermal Science
PY - 2018
VL - 22
IS - 14
SP - 1217
EP - 1229
PT - Article
AB - Climate changes which we are experiencing at the moment are affecting the  entire globe. Serbia, as a developing country, is in the process of defining  its own energy strategy and priorities when it comes to the problem of  increased energy consumption in its building stock. Research shows that  residential sector consumes the largest quantity of energy. CO2 emissions  present another big problem which is in a direct correlation with energy  consumption. Green roofs have multiple positive effects on buildings and  their surroundings which make them a desirable option for retrofitting roofs.  The aim of this paper is to investigate thermal properties of chosen green  roof system and its potential to positively influence energy consumption for  heating buildings and therefore CO2 emissions trough refurbishing existing  old flat roofs. New Belgrade was chosen for this research for its unique  urban characteristics - existence of large number of similar or identical  buildings, which have same structural characteristics and similar  surroundings. For the purpose of this paper, blocks 45 and 70 were chosen.  Results of this research are applicable on all of the 132 buildings found at  this location, which have total roof area of 90990m2. By calculating energy  quantity needed for heating the building with the existing roof and two  hypothetical models, which have green roof, it was possible to quantify  energy savings, which are in a direct correlation with CO2 emissions. A  control roof was introduced in order to examine if the proposed green roof  possesses better characteristics than a traditional solution, most commonly  used in Serbia. Apart from energy savings, overall impact of the green roof  on the CO2 reduction per building was calculated. By multiplying these  results, we drew the conclusion that a project such as greening roofs of  existing residential buildings in blocks 45 and 70 would have a noticeable  effect on both the energy savings and CO2 emissions.