Comparison of mixing and displacement ventilation in a low energy office building during heating season

Lei Fang, Bjarne W. Olesen, Xiaozhou Wu, Fenghao Wang, Jianing Zhao

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    The present study investigated the performance of mixing and displacement ventilation systems in a low energy office building during heating season. Measurements were performed with regard to air distribution and ventilation effectiveness. The results show that indoor air temperatures in occupied zone was 21.0°C for mixing ventilation and 20.8°C for displacement ventilation when supply air temperature was 19°C and air change rate was 4.2 h-. Vertical air temperature difference between the head level and the foot level were all less than 3°C and local air velocity were all less than 0.2m/s for both ventilation systems. In addition, local ventilation effectiveness ranged from 0.91 to 0.94 for mixing ventilation and from 1.03 to 1.17 for displacement ventilation. Distributions of vertical air temperature and velocity and horizontal contaminant concentration were more uniform for mixing ventilation compared to those for displacement ventilation. Due to the heat emission from equipments and occupants, heating system was not needed in the low energy office building in a mild winter. In such a situation, indoor thermal environment was still acceptable in terms of the general thermal comfort and the local thermal discomfort for a standard office worker.
    Original languageEnglish
    Title of host publicationProceedings of Indoor Air 2014
    Publication date2014
    Pages492-499
    Publication statusPublished - 2014
    Event13th International Conference on Indoor Air Quality and Climate - University of Hong Kong, Hong Kong, Hong Kong
    Duration: 7 Jul 201412 Jul 2014
    Conference number: 13
    http://www.indoorair2014.org/

    Conference

    Conference13th International Conference on Indoor Air Quality and Climate
    Number13
    LocationUniversity of Hong Kong
    Country/TerritoryHong Kong
    CityHong Kong
    Period07/07/201412/07/2014
    Internet address

    Fingerprint

    Dive into the research topics of 'Comparison of mixing and displacement ventilation in a low energy office building during heating season'. Together they form a unique fingerprint.

    Cite this