Comparative study of overheating assessment approaches in university buildings: Impact of different climate zones and shading devices in Turkey

Abstract

Overheating has become a significant global concern, driven by climate change and more frequent extreme heatwaves. This study examines how various factors, including building orientation, window area, and shading devices, influence overheating hours in two university buildings in Balikesir, Turkey. The operative temperature values for these buildings, which face different orientations, were derived from measurements of indoor air conditions. Subsequently, both buildings were modelled using EnergyPlus software to simulate operative temperature values. Numerical calculations of operative temperature values were conducted for four selected classrooms based on CIBSE Guide A to further this investigation. A comparative analysis was performed to evaluate the impact of different shading devices on these temperature values. The results indicated that Venetian blinds and shade rolls significantly reduced overheating, whereas overhangs had a minor effect. Additionally, to assess the influence of climate on operative temperature values, simulations were carried out for various regions as defined by Turkish Building Standard 825, aiming to develop a general overheating strategy applicable to the entire region. A critical finding of this research is that the commonly accepted threshold value of 26 degrees C is not suitable for Turkey; instead, higher limit values should be established for countries with similar climates. Consequently, the study emphasises the need for urgent measures in hotter regions rather than those with colder climates. This research represents an important advancement in the comparative analysis of numerical data, simulations, and field measurements, providing valuable insights for future studies and standard threshold values in overheating assessments.