Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods

Weixin Zhao; Panu Mustakallio; Sami Lestinen; Simo Kilpelainen; Juha Jokisalo; Risto Kosonen

doi:10.3390/buildings12091314

Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods

Weixin Zhao^*, Panu Mustakallio, Sami Lestinen, Simo Kilpelainen, Juha Jokisalo, Risto Kosonen

^*Corresponding author for this work

Department of Mechanical Engineering

Research output: Contribution to journal › Article › Scientific › peer-review

6 Citations (Scopus)

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Abstract

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 (

Original language	English
Article number	1314
Number of pages	16
Journal	Buildings
Volume	12
Issue number	9
DOIs	https://doi.org/10.3390/buildings12091314
Publication status	Published - Sept 2022
MoE publication type	A1 Journal article-refereed

Keywords

classroom
indoor air quality
thermal comfort
air distribution
CFD
THERMAL ENVIRONMENT
VENTILATION RATE
QUALITY
PERFORMANCE
SCHOOLWORK
SYSTEMS
OFFICE

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buildings-12-01314-v2Final published version, 6.84 MBLicence: CC BY

Cite this

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title = "Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods",

abstract = "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 (",

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author = "Weixin Zhao and Panu Mustakallio and Sami Lestinen and Simo Kilpelainen and Juha Jokisalo and Risto Kosonen",

year = "2022",

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AU - Zhao, Weixin

AU - Mustakallio, Panu

AU - Lestinen, Sami

AU - Kilpelainen, Simo

AU - Jokisalo, Juha

AU - Kosonen, Risto

PY - 2022/9

Y1 - 2022/9

N2 - 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 (

AB - 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 (

KW - classroom

KW - indoor air quality

KW - thermal comfort

KW - air distribution

KW - CFD

KW - THERMAL ENVIRONMENT

KW - VENTILATION RATE

KW - QUALITY

KW - PERFORMANCE

KW - SCHOOLWORK

KW - SYSTEMS

KW - OFFICE

U2 - 10.3390/buildings12091314

DO - 10.3390/buildings12091314

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JO - Buildings

JF - Buildings

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M1 - 1314

ER -

Numerical and Experimental Study on the Indoor Climate in a Classroom with Mixing and Displacement Air Distribution Methods

Abstract

Keywords

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