6 Citationer (Scopus)
237 Downloads (Pure)

Resumé

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.
OriginalsprogEngelsk
TidsskriftBuilding Simulation
Vol/bind10
Udgave nummer2
Sider (fra-til)203-218
ISSN1996-3599
DOI
StatusUdgivet - 2017

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

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    @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",
    number = "2",

    }

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

    I: Building Simulation, Bind 10, Nr. 2, 2017, s. 203-218.

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer 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

    Y1 - 2017

    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.

    KW - Diffuse Ceiling Ventilation

    KW - Radiant ceiling

    KW - CFD

    KW - Parametric study

    KW - Thermal comfort

    KW - energy efficiency

    U2 - 10.1007/s12273-016-0318-z

    DO - 10.1007/s12273-016-0318-z

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