Nowadays large transparent surfaces are widely used in office and public buildings. The positive effect of great views and natural light on people’s comfort is well known, but the high glazed ratio of building facades can lead to excessively high cooling energy demands. The heat load can be reduced by using glazing with high reflexion coating outwards and low emission coating inwards, triple panes and inert gas between the panes. Choosing proper thermal mass can further help in reducing the amplitude of the indoor operative temperature. In this paper the effects of solar factor of glazing, heat transfer coefficient of windows, windows area and thermal mass were analysed in an imaginary room with 3.0×4.0×2.8 m dimensions. As the results show the effect of the overall heat transfer coefficient is negligible. The effect of solar factor depends on the orientation. The expected differences between the amplitudes of the operative temperature are between 0.5 to 6 K for the analyzed room, depending on the thermal mass, orientation, solar factor and window area.
The research work was done in the Building Physics Laboratory of the Department of Building Services and Building Engineering, University of Debrecen. The test room could be heated by radiator, wall, floor and ceiling heating. The main goal of this research was to see how the internal temperature varies during the heating up period, how much is the increment during the 3 hours measurement and how much the energy consumption is. This paper presents the results of the research work. The obtained results have proven that in our case the ceiling and radiator heating gave the higher increment of operative temperature and the lower energy consumption.
and outdoor total DH percentage for the hottest week in the summer, autumn and winter seasons. In the summer week, the operativetemperature is always above 32 o C, while for the ODB all the hours are above 28 o C, and 95 and 81% of the hours are
lamellas are more advantageous (10%), and finally, fixed horizontal louvres (14%) reach best comfort compared to Model 1 ( Fig. 3 ). The reference Model 1 and the model with best results (Model 5) were compared according to the operativetemperature
of the operativetemperature hours delivers better performance in the new building. In a sample office at the west corner of the building (with west and north oriented façades and windows) 43% more comfort hours are performed in occupation duration
Authors:Kristóf Roland Horváth and István Kistelegdi
Code’ in the field of comfort-energy-environment. The evaluation is done in the following sub-categories: thermal (operativetemperature) and visual comfort (daylight factor), air quality (CO 2 -concentration), energy demand, origin of energy supply and