Parametrical analysis on the diffuse ceiling ventilation by experimental and numerical studies

Chen Zhang, Martin Heine Kristensen, Jakob Sølund Jensen, Per Kvols Heiselberg, Rasmus Lund Jensen, Michal Zbigniew Pomianowski

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

14 Citationer (Scopus)

Resumé

This paper aims to investigate the performance of diffuse ceiling ventilation in a classroom. An experimental study is carried out in a test chamber to examine the impact of diffuse ceiling opening area on the system cooling capacity and thermal comfort. The results indicate that diffuse ceiling ventilation provides a satisfied thermal comfort level in the occupied zone even under a high ventilation rate and a high heat load condition. A design chart method is adopted to compare different diffuse ceiling configurations, and the results indicate that the system with a 18% diffuse ceiling opening area is able to handle the highest heat load without discomfort. On the other hand, a CFD model is built where the diffuse ceiling is simulated with a porous media zone. This model is validated by experimental results and further used to analyze the effect of heat load distribution and room height. The numerical results reveal that even distribution of heat sources gives a lower draught risk environment than centralized distribution. In addition, there is a significant increase on the draught risk with increase of room height.
OriginalsprogEngelsk
TidsskriftEnergy and Buildings
Vol/bind111
Sider (fra-til)87-97
Antal sider10
ISSN0378-7788
DOI
StatusUdgivet - 1 jan. 2016

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Ceilings
Ventilation
Thermal load
Thermal comfort
Cooling systems
Porous materials
Computational fluid dynamics

Citer dette

@article{18eaf879e64543119a6717ad392c7501,
title = "Parametrical analysis on the diffuse ceiling ventilation by experimental and numerical studies",
abstract = "This paper aims to investigate the performance of diffuse ceiling ventilation in a classroom. An experimental study is carried out in a test chamber to examine the impact of diffuse ceiling opening area on the system cooling capacity and thermal comfort. The results indicate that diffuse ceiling ventilation provides a satisfied thermal comfort level in the occupied zone even under a high ventilation rate and a high heat load condition. A design chart method is adopted to compare different diffuse ceiling configurations, and the results indicate that the system with a 18{\%} diffuse ceiling opening area is able to handle the highest heat load without discomfort. On the other hand, a CFD model is built where the diffuse ceiling is simulated with a porous media zone. This model is validated by experimental results and further used to analyze the effect of heat load distribution and room height. The numerical results reveal that even distribution of heat sources gives a lower draught risk environment than centralized distribution. In addition, there is a significant increase on the draught risk with increase of room height.",
keywords = "Diffuse ceiling ventilation , Thermal comfort , Design chart , Parametrical study , CFD",
author = "Chen Zhang and Kristensen, {Martin Heine} and Jensen, {Jakob S{\o}lund} and Heiselberg, {Per Kvols} and Jensen, {Rasmus Lund} and Pomianowski, {Michal Zbigniew}",
year = "2016",
month = "1",
day = "1",
doi = "10.1016/j.enbuild.2015.11.041",
language = "English",
volume = "111",
pages = "87--97",
journal = "Energy and Buildings",
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publisher = "Elsevier",

}

Parametrical analysis on the diffuse ceiling ventilation by experimental and numerical studies. / Zhang, Chen; Kristensen, Martin Heine; Jensen, Jakob Sølund; Heiselberg, Per Kvols; Jensen, Rasmus Lund; Pomianowski, Michal Zbigniew.

I: Energy and Buildings, Bind 111, 01.01.2016, s. 87-97.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Parametrical analysis on the diffuse ceiling ventilation by experimental and numerical studies

AU - Zhang, Chen

AU - Kristensen, Martin Heine

AU - Jensen, Jakob Sølund

AU - Heiselberg, Per Kvols

AU - Jensen, Rasmus Lund

AU - Pomianowski, Michal Zbigniew

PY - 2016/1/1

Y1 - 2016/1/1

N2 - This paper aims to investigate the performance of diffuse ceiling ventilation in a classroom. An experimental study is carried out in a test chamber to examine the impact of diffuse ceiling opening area on the system cooling capacity and thermal comfort. The results indicate that diffuse ceiling ventilation provides a satisfied thermal comfort level in the occupied zone even under a high ventilation rate and a high heat load condition. A design chart method is adopted to compare different diffuse ceiling configurations, and the results indicate that the system with a 18% diffuse ceiling opening area is able to handle the highest heat load without discomfort. On the other hand, a CFD model is built where the diffuse ceiling is simulated with a porous media zone. This model is validated by experimental results and further used to analyze the effect of heat load distribution and room height. The numerical results reveal that even distribution of heat sources gives a lower draught risk environment than centralized distribution. In addition, there is a significant increase on the draught risk with increase of room height.

AB - This paper aims to investigate the performance of diffuse ceiling ventilation in a classroom. An experimental study is carried out in a test chamber to examine the impact of diffuse ceiling opening area on the system cooling capacity and thermal comfort. The results indicate that diffuse ceiling ventilation provides a satisfied thermal comfort level in the occupied zone even under a high ventilation rate and a high heat load condition. A design chart method is adopted to compare different diffuse ceiling configurations, and the results indicate that the system with a 18% diffuse ceiling opening area is able to handle the highest heat load without discomfort. On the other hand, a CFD model is built where the diffuse ceiling is simulated with a porous media zone. This model is validated by experimental results and further used to analyze the effect of heat load distribution and room height. The numerical results reveal that even distribution of heat sources gives a lower draught risk environment than centralized distribution. In addition, there is a significant increase on the draught risk with increase of room height.

KW - Diffuse ceiling ventilation

KW - Thermal comfort

KW - Design chart

KW - Parametrical study

KW - CFD

U2 - 10.1016/j.enbuild.2015.11.041

DO - 10.1016/j.enbuild.2015.11.041

M3 - Journal article

VL - 111

SP - 87

EP - 97

JO - Energy and Buildings

JF - Energy and Buildings

SN - 0378-7788

ER -