Browsing by Author "Ranjbar, Ali"

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Open Access
Analysing the effects of thermal comfort and indoor air quality in design studios and classrooms on student performance
(IOP, 2019) Ranjbar, Ali
This study aimed to explore the various effects of different ventilation modes on the thermal comfort and indoor air quality in design education environment. It also investigated the relationship between the ventilation mode and student performance. Thus, an experimental study was conducted in both studio and classroom environments, in Interior Architecture and Environmental Design Department at Bilkent University, Ankara, Turkey. CO2 concentration values, indoor air temperature and humidity values as the main parameters of thermal comfort and indoor air quality was measured in both winter and summer seasons under the three modes of ventilation: 1) without opening door and windows mode setting; (2) natural ventilation mode and (3) the HVAC ventilation mode achieved by the TROX school-air unit. Under these three different modes for both attention and concentration levels, 100 students from the winter season, 50 students from summer season for the classroom environment, and 20 students from the winter season, 16 students from summer season for the studio environment participated. Results were calculated in IBM SPSS 21 software separately for both seasons and three different ventilation modes. As a result, the experimental and performance results have shown that the HVAC unit mode achieved the most satisfactory indoor environment in both seasons and higher levels of student performance.
Open Access
Analyzing the effects of thermal comfort and indoor air quality in design studios and classrooms on student performance
(2017-07) Ranjbar, Ali
The present study aims to evaluate the effects of the different ventilation modes on thermal comfort and indoor air quality in design studios and classrooms. It also investigates its associations with student performance. For this purpose, experimental and subjective measurements are used in both studio and classroom, in Interior Architecture and Environmental Design Department at Bilkent University, Ankara. CO2 concentration, indoor temperature and humidity values are collected in both winter and summer season under the three modes of ventilation: 1) without opening door and windows mode setting; (2) natural ventilation mode and (3) the mechanical TROX school-air unit mode. The thermal comfort and IAQ was investigated through CO2 concentration and temperature and humidity in these three different ventilation modes. Under these three modes in both seasons, student performance is assessed based on concentration and attention test results. Both experimental and subjective results have shown that the mechanical TROX school-air unit mode is the most satisfactory indoor environment in terms of standards, where the highest grade of students’ concentration and attention are obtained.
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Clemens Holzmeister : a second modern architectural movement in Turkey between 1930–1950
(Bilkent University, 2015) Ranjbar, Ali; Yamralı, Hamid; Ryu, SoLa; Kim, Yeji
Open Access
Impact of building massing on energy efficient school buildings
(Springer, 2020) Afacan, Yasemin; Ranjbar, Ali; Littlewood, J.; Howlett, R. J.; Capozzoli, A.; Jain, L. C.
To produce energy-efficient buildings, optimization process for all design stages is necessary. Optimization starts with the massing of the building. This study investigates the impact of the five school massing typologies on energy efficiency: (i) spine/street; (ii) city/town; (iii) atrium; (iv) strawberry/cluster; and (v) courtyard. The chosen massing typologies respond to the question of what an optimum spatial organization of massing is to (i) maximize the use of renewable resources; (ii) utilize thermal inertia of buildings; and (iii) consider the relationship between inside and outside, both existing and future. For each massing type, Sefaira program was used, and simulations were run for annual energy use, annual energy cost and annual carbon dioxide (CO2)(CO2) emissions. The energy use indices (EUI) of the alternatives are around 86 kWh/m2/yr. In the spine massing, the EUI value is much higher than the other four buildings. The highest annual net CO2CO2 emissions are obtained in atrium type of building, which has more floors compared to other massing type. The courtyard type has the most efficient annual electricity cost per area. These findings showed that the goal of the building massing should be not only limited to achieve the low EUI. Thus, this study suggests that an energy-efficient massing should address the questions beyond well-known ASHRAE standards, and define a new holistic model that considers the ratio of surface area to volume more for reducing energy loads than a typical high-performance schools.