Numerical analysis of diffuse ceiling ventilation and its integration with a radiant ceiling system

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6 Citations (Scopus)
224 Downloads (Pure)

Abstract

A novel system combining diffuse ceiling ventilation and radiant ceiling was proposed recently, with the aim of providing energy efficient and comfort environment to office buildings. Designing of such a system is challenging because of complex interactions between the two subsystems and a large number of design parameters encountered in practice. This study aimed to develop a numerical model that can reliably predict the airflow and thermal performance of the integrated system during the design stage. The model was validated by experiments under different operating conditions. The validated model was further applied to evaluate the effects of different design parameters, including the U-value of the diffuse ceiling panel, plenum height, plenum depth, and inlet configuration. In the integrated system, diffuse ceiling separated the radiant ceiling from the rest of the room and consequently changed the energy efficiency of the radiant system. The simulated results demonstrated that using ceiling panel with a higher U-value can minimize this impact and make the system to cool down space efficiently. Low plenum height was beneficial to the energy efficiency, but aggravated the non-uniformity air distribution and further led to the draught problem in the occupied zone. This system was recommended to apply in the small offices instead of large, open spaces.
Original languageEnglish
JournalBuilding Simulation
Volume10
Issue number2
Pages (from-to)203-218
ISSN1996-3599
DOIs
Publication statusPublished - 2017

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Ceilings
Ventilation
Numerical analysis
Energy efficiency
Office buildings
Numerical models
Air
Experiments

Keywords

  • Diffuse Ceiling Ventilation
  • Radiant ceiling
  • CFD
  • Parametric study
  • Thermal comfort
  • energy efficiency

Cite this

@article{ce53a701d1da45cb8272ffd530e7aa32,
title = "Numerical analysis of diffuse ceiling ventilation and its integration with a radiant ceiling system",
abstract = "A novel system combining diffuse ceiling ventilation and radiant ceiling was proposed recently, with the aim of providing energy efficient and comfort environment to office buildings. Designing of such a system is challenging because of complex interactions between the two subsystems and a large number of design parameters encountered in practice. This study aimed to develop a numerical model that can reliably predict the airflow and thermal performance of the integrated system during the design stage. The model was validated by experiments under different operating conditions. The validated model was further applied to evaluate the effects of different design parameters, including the U-value of the diffuse ceiling panel, plenum height, plenum depth, and inlet configuration. In the integrated system, diffuse ceiling separated the radiant ceiling from the rest of the room and consequently changed the energy efficiency of the radiant system. The simulated results demonstrated that using ceiling panel with a higher U-value can minimize this impact and make the system to cool down space efficiently. Low plenum height was beneficial to the energy efficiency, but aggravated the non-uniformity air distribution and further led to the draught problem in the occupied zone. This system was recommended to apply in the small offices instead of large, open spaces.",
keywords = "Diffuse Ceiling Ventilation, Radiant ceiling, CFD, Parametric study, Thermal comfort, energy efficiency",
author = "Chen Zhang and Heiselberg, {Per Kvols} and Qingyan Chen and Pomianowski, {Michal Zbigniew}",
year = "2017",
doi = "10.1007/s12273-016-0318-z",
language = "English",
volume = "10",
pages = "203--218",
journal = "Building Simulation",
issn = "1996-3599",
publisher = "Tsinghua University",
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}

Numerical analysis of diffuse ceiling ventilation and its integration with a radiant ceiling system. / Zhang, Chen; Heiselberg, Per Kvols; Chen, Qingyan; Pomianowski, Michal Zbigniew.

In: Building Simulation, Vol. 10, No. 2, 2017, p. 203-218.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Numerical analysis of diffuse ceiling ventilation and its integration with a radiant ceiling system

AU - Zhang, Chen

AU - Heiselberg, Per Kvols

AU - Chen, Qingyan

AU - Pomianowski, Michal Zbigniew

PY - 2017

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N2 - A novel system combining diffuse ceiling ventilation and radiant ceiling was proposed recently, with the aim of providing energy efficient and comfort environment to office buildings. Designing of such a system is challenging because of complex interactions between the two subsystems and a large number of design parameters encountered in practice. This study aimed to develop a numerical model that can reliably predict the airflow and thermal performance of the integrated system during the design stage. The model was validated by experiments under different operating conditions. The validated model was further applied to evaluate the effects of different design parameters, including the U-value of the diffuse ceiling panel, plenum height, plenum depth, and inlet configuration. In the integrated system, diffuse ceiling separated the radiant ceiling from the rest of the room and consequently changed the energy efficiency of the radiant system. The simulated results demonstrated that using ceiling panel with a higher U-value can minimize this impact and make the system to cool down space efficiently. Low plenum height was beneficial to the energy efficiency, but aggravated the non-uniformity air distribution and further led to the draught problem in the occupied zone. This system was recommended to apply in the small offices instead of large, open spaces.

AB - A novel system combining diffuse ceiling ventilation and radiant ceiling was proposed recently, with the aim of providing energy efficient and comfort environment to office buildings. Designing of such a system is challenging because of complex interactions between the two subsystems and a large number of design parameters encountered in practice. This study aimed to develop a numerical model that can reliably predict the airflow and thermal performance of the integrated system during the design stage. The model was validated by experiments under different operating conditions. The validated model was further applied to evaluate the effects of different design parameters, including the U-value of the diffuse ceiling panel, plenum height, plenum depth, and inlet configuration. In the integrated system, diffuse ceiling separated the radiant ceiling from the rest of the room and consequently changed the energy efficiency of the radiant system. The simulated results demonstrated that using ceiling panel with a higher U-value can minimize this impact and make the system to cool down space efficiently. Low plenum height was beneficial to the energy efficiency, but aggravated the non-uniformity air distribution and further led to the draught problem in the occupied zone. This system was recommended to apply in the small offices instead of large, open spaces.

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