Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods
One main challenge of air distribution in classrooms is to guarantee ventilation performance under different usage conditions. In this study, the indoor climate in summer and winter conditions with different occupancy densities in the classroom is presented. Thermal condition measurements of a half-...
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MDPI AG
2022-08-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/12/9/1314 |
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| author | Weixin Zhao Panu Mustakallio Sami Lestinen Simo Kilpeläinen Juha Jokisalo Risto Kosonen |
| author_facet | Weixin Zhao Panu Mustakallio Sami Lestinen Simo Kilpeläinen Juha Jokisalo Risto Kosonen |
| author_sort | Weixin Zhao |
| collection | DOAJ |
| description | One main challenge of air distribution in classrooms is to guarantee ventilation performance under different usage conditions. In this study, the indoor climate in summer and winter conditions with different occupancy densities in the classroom is presented. Thermal condition measurements of a half-size classroom were performed in a test room with four air suppliers: wall-grilles, ceiling diffusers, perforated duct diffusers, and displacement ventilation. Those measured data were used for CFD validation of the whole classroom. With CFD simulations, indoor climate parameters with different air diffusers are compared in summer and winter conditions. The results show that displacement ventilation gives the best performance in the occupied zone. The air change efficiency can be reached with displacement ventilation of 1.4 and of only 1 with the other three air diffusers. The air velocities were reasonably low (<0.3 m/s), and the indoor was quite uniform with ceiling diffusers, which is another well-performing solution for classrooms. Corridor wall-grilles give uniform thermal conditions but can have high velocities (0.4 m/s) on the perimeter side of the room space. The air distribution from the perforated duct diffuser is unstable, which causes high local draft (over 20%) in the occupied zone. |
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| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-10T00:32:34Z |
| publishDate | 2022-08-01 |
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| spelling | doaj.art-794d5475e59d4e40bbba0d51c5111f952023-11-23T15:22:27ZengMDPI AGBuildings2075-53092022-08-01129131410.3390/buildings12091314Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution MethodsWeixin Zhao0Panu Mustakallio1Sami Lestinen2Simo Kilpeläinen3Juha Jokisalo4Risto Kosonen5Department of Mechanical Engineering, Aalto University, 02150 Espoo, FinlandDepartment of Mechanical Engineering, Aalto University, 02150 Espoo, FinlandDepartment of Mechanical Engineering, Aalto University, 02150 Espoo, FinlandDepartment of Mechanical Engineering, Aalto University, 02150 Espoo, FinlandDepartment of Mechanical Engineering, Aalto University, 02150 Espoo, FinlandDepartment of Mechanical Engineering, Aalto University, 02150 Espoo, FinlandOne main challenge of air distribution in classrooms is to guarantee ventilation performance under different usage conditions. In this study, the indoor climate in summer and winter conditions with different occupancy densities in the classroom is presented. Thermal condition measurements of a half-size classroom were performed in a test room with four air suppliers: wall-grilles, ceiling diffusers, perforated duct diffusers, and displacement ventilation. Those measured data were used for CFD validation of the whole classroom. With CFD simulations, indoor climate parameters with different air diffusers are compared in summer and winter conditions. The results show that displacement ventilation gives the best performance in the occupied zone. The air change efficiency can be reached with displacement ventilation of 1.4 and of only 1 with the other three air diffusers. The air velocities were reasonably low (<0.3 m/s), and the indoor was quite uniform with ceiling diffusers, which is another well-performing solution for classrooms. Corridor wall-grilles give uniform thermal conditions but can have high velocities (0.4 m/s) on the perimeter side of the room space. The air distribution from the perforated duct diffuser is unstable, which causes high local draft (over 20%) in the occupied zone.https://www.mdpi.com/2075-5309/12/9/1314classroomindoor air qualitythermal comfortair distributionCFD |
| spellingShingle | Weixin Zhao Panu Mustakallio Sami Lestinen Simo Kilpeläinen Juha Jokisalo Risto Kosonen Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods Buildings classroom indoor air quality thermal comfort air distribution CFD |
| title | Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods |
| title_full | Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods |
| title_fullStr | Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods |
| title_full_unstemmed | Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods |
| title_short | Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods |
| title_sort | numerical and experimental study on the indoor climate in a classroom with mixing and displacement air distribution methods |
| topic | classroom indoor air quality thermal comfort air distribution CFD |
| url | https://www.mdpi.com/2075-5309/12/9/1314 |
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