The influence of humidity in modelling buoyancy-driven indoor ventilation

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    Abstract

    Numerical modelling and experiments have been conducted to study indoor buoyancy–driven ventilation flows often with assumptions of adiabatic boundaries or using salt-bath technique. By employing these approaches, heat transfer at side walls and absorption coefficient of the working fluid are then neglected. Hence, a significant difference exists between realistic cases and models. The CFD results in this study show a good agreement with experimental results conducted previously (Sandbach and Lane-Serff, 2011a). The vertical temperature profiles for a heat source of 2.4kW at real times 3, 30, and 60 minutes match better than the 1-D mathematical models previously developed. The CFD results have shown to have a better agreement with experimental data to a percentage 8% to 11.4% higher compare to mathematical model. The results indicate that the radiative absorption of the medium has a significant effect on thermal distribution within the enclosure; hence it should be taken into account when modelling thermal radiation of ventilation flow with non-transparent working fluid.
    Original languageEnglish
    Title of host publicationIndoor Air 2014: 13th International Conference on Indoor Air Quality and Climate
    Pages153-160
    Number of pages8
    Publication statusPublished - Jul 2014
    EventIndoor Air 2014: 13th International Conference on Indoor Air Quality and Climate - Hong Kong
    Duration: 7 Jul 201412 Jul 2014

    Conference

    ConferenceIndoor Air 2014: 13th International Conference on Indoor Air Quality and Climate
    CityHong Kong
    Period7/07/1412/07/14

    Keywords

    • Radiation
    • Displacement Ventilation
    • Absorption
    • Buoyancy

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