Thermal coupling of leakage flows and heating load of buildings

Reijo Kohonen, Tuomo Ojanen, Markku Virtanen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    The actual heating load of a building differs often from the designed load. One reason for this is the uncontrolled ventilation through a building envelope. The heating load of air infiltration has, in practical calculations, been calculated according to the predicted leakage flow rate and to the indoor and outdoor air temperature difference. We suggest, however, that the value of transmission heat losses should be corrected by a factor, Nusselt number, because of the thermal interaction of leakage flows and conduction heat transfer in wall structures. According to computer simulations and experiments, the warming up of leakage flow may be as high as 90 % of the indoor and outdoor air temperature difference. Correspondingly, the Nusselt numbers describing the mean relative reduction of transmission heat losses can be 0,65. The seasonal heating energy savings are of the order of 10 - 15 %, The thermal interaction of leakage flows and wall structures was analyzed by computer simulation and experiments with some elementary flow cases in typical wall structures, The results are, however, so obvious that some theoretical and practical conclusions could be made.
    Original languageEnglish
    Title of host publication8th AIVC Conference
    Subtitle of host publicationVentilation technology Research and application
    PublisherAir Infiltration & Ventilation Centre AIVC
    Pages10.1-10.21
    ISBN (Print)978-0-946075-32-4
    Publication statusPublished - 1987
    MoE publication typeA4 Article in a conference publication
    Event8th AIVC Conference "Ventilation technology research and application" - Überlingen, Germany
    Duration: 21 Sep 198724 Sep 1987

    Conference

    Conference8th AIVC Conference "Ventilation technology research and application"
    CountryGermany
    CityÜberlingen
    Period21/09/8724/09/87

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  • Cite this

    Kohonen, R., Ojanen, T., & Virtanen, M. (1987). Thermal coupling of leakage flows and heating load of buildings. In 8th AIVC Conference: Ventilation technology Research and application (pp. 10.1-10.21). Air Infiltration & Ventilation Centre AIVC. https://www.aivc.org/resource/thermal-coupling-leakage-flows-and-heating-load-buildings