Evaluating the Effect of External Horizontal Fixed Shading Devices’ Geometry on Internal Air Temperature, Daylighting and Energy Demand in Hot Dry Climate. Case Study of Ghardaïa, Algeria
| Autor: | Hassan Ait Haddou, Aicha Boussoualim, Sahar Magri Elouadjeri |
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| Rok vydání: | 2021 |
| Předmět: |
Building construction
Leading-edge slats thermal comfort daylighting Illuminance Thermal comfort Geometry Building and Construction Dynamic simulation energy saving numerical simulation Architecture Thermal solar shading devices parametric analysis Radiance Environmental science Shading hot and dry climate TH1-9745 Daylighting Civil and Structural Engineering |
| Zdroj: | Buildings Volume 11 Issue 8 Buildings, Vol 11, Iss 348, p 348 (2021) |
| ISSN: | 2075-5309 |
| Popis: | The present study investigates the effect of fixed external shading devices’ geometry on thermal comfort, daylighting and energy demand for cooling and heating in the hot and dry climate of the city of Ghardaïa (Algeria). A parametric analysis was performed by using three software: RADIANCE 2.0 and DAYSIM 3.1 for daylighting simulation and TRNSYS.17 for thermal dynamic simulation. Three shading device parameters were assessed: the spacing between slats, the tilted angle and the slats installation. The vertical shading angle “VSA” is fixed it is equal to the optimum shading angle measured for Ghardaïa. The simulation results indicate that fixed external shading devices have a significant impact on decreasing the energy demand for cooling however, they are unable to reduce the total energy demand since they significantly increase heating loads. It was found that fixed external shading devices remove all risks associated with glare in summer by decreasing illuminance close to the window however, they do not improve daylighting performance in winter because of glare. We note that even if the vertical shading angle “VSA” was the same for all cases, these did not present the same thermal and luminous behavior. This is mainly due to the amount and the way that the solar radiation penetrates space. |
| Databáze: | OpenAIRE |
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