Browsing by Subject "Sunlight"

Filter results by typing the first few letters
Now showing 1 - 3 of 3
  • Thumbnail Image
    ItemOpen Access
    A critical analysis of sunlight patches in patient rooms via simulation
    (Taylor & Francis, 2008) Tanrıöver, S.; Düzgüneş, A.; Yilmazer, S.
    Recent research on patient recovery has indicated significant improvement in the conditions of patients treated in sunny rooms compared to those treated in shaded rooms. In this study, the amount of sunlight received in patient rooms with different orientations and opening positions was observed. Desktop Radiance 1.02 software was used to simulate the conditions in a typical double patient room. The area and location of sunlight patches on room surfaces were considered as analog indicators for the investigation. Seven orientations and three positions of standard window openings were studied on an hourly basis in different combinations at solstices and equinoxes from sunrise to sunset. Data were statistically analyzed for advantageous combinations of orientation and opening positions. Results indicated that rooms with right- and left-shifted openings receive direct sunlight more than rooms with centered openings, and these have sunlight mostly on walls, while those with centered openings have it mostly on floors. The study revealed that opening positions rather than orientation is crucial to the design of patient rooms regarding the penetration of sunlight. Orientation is effective only when the room surfaces are studied individually. The study enabled sun patches to be visualized in relation to patient beds, which is a significant determinant that can affect the location of the bed, and so patient in the room. The paper concludes with four proposals of an informal choice from these combinations that both admits sunlight and protects the patient from glare and excessive heat gain.
  • Thumbnail Image
    ItemOpen Access
    Daylighting and its effects on interior atmospheres
    (1996) Tevfikler, Ayşe Banu
    In this work, daylighting has been studied from its effect on the interior atmosphere point of view. This required investigating the scope that it can be employed as a design element for the built form. Within this aspect, the various factors influencing the way that it can be presented within an interior space are examined. Several impressions have been defined previously by researchers through statistical analyses as results of lighting patterns employed within an interior. These are tried to see if they are obtainable by daylighting. Building examples which make use of different strategies of daylighting are chosen and examined as to whether the defined impressions were felt as a consequence of the daylighting on the interior atmosphere.
  • Thumbnail Image
    ItemOpen Access
    Structural and optical properties of Cu-doped ZnAl2O4 and its application as photocatalyst for Cr(VI) reduction under sunlight
    (Elsevier, 2020) Akika, F. Z.; Benamira, M.; Lahmar, H.; Trari, M.; Avramova, I.; Süzer, Şefik
    Cu-doped ZnAl2O4 spinel oxides (Zn(1-x)CuxAl2O4, 0.0 ≤ x ≤ 1.0) were synthesized by co-precipitation method at 800 °C. The X-ray diffraction analysis of the as-prepared powders confirmed a spinel structure with a space group Fd-3 m. XPS was used to investigate the state of the material surface and the elemental composition. The SEM image confirmed the presence of nano spherical particles. The optical properties were characterized by UV–Vis diffuse reflectance and all band gap values, in the range of 1.71 to 3.54 eV, indicate a semiconductor character of our compounds. The energy bandgap (Eg) values of Zn(1-x)CuxAl2O4 decreased with increasing of the copper content. The photocatalytic activity was evaluated for Cr(VI) reduction under sunlight irradiation. The highest photoreduction efficiency was obtained for Zn0.2Cu0.8Al2O4 with a removal ratio of 75% after 150 min. The increase of surface area increases the photocatalytic activity as it implies larger contact surfaces exposed to Cr(VI). High surface area and pore volume are useful in the formation of photogenerated electron and hole pairs. The kinetics of photoreduction follow the modified Langmuir-Hinshelwood model. The obtained results indicate a good photocatalytic activity, in particular for compounds with a high content of Cu.