Heat transfer coeffcient for boiling carbon dioxide.

Hans Jørgen Høgaard Knudsen, Per Henrik Jensen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch


    Heat transfer coefficient and pressure drop for boiling carbon dioxide (R744) flowing in a horizontal pipe has been measured. The pipe is heated by condensing R22 outside the pipe. The heat input is supplied by an electrical heater wich evaporates the R22. With the heat flux assumed constant over the whole surface and with measured temperature difference between the inner surface and the evaporation temperature a mean heat transfer coefficient is calculated. The calculated heat transfer coefficient has been compared with the Chart Correlation of Shah. The Chart Correlation predicts too low heat transfer coefficient but the ratio between the measured and the calculated heat transfer coefficient is nearly constant and equal 1.9. With this factor the correlation predicts the measured data within 14% (RMS). The pressure drop is of the same order as the measuring uncertainty and the pressure drop has not been compared to correlation's.
    Original languageEnglish
    Title of host publicationCompression Systems with Natural Working Fluids
    Place of PublicationSittard, The Netherlands
    PublisherIEA Heat Pump Centre
    Publication date1997
    Publication statusPublished - 1997
    EventIEA Annex 22 Workshop on: Compression System with Natural Working Fluids. - Gatlinburg, Tennessee, USA
    Duration: 1 Jan 1997 → …


    ConferenceIEA Annex 22 Workshop on: Compression System with Natural Working Fluids.
    CityGatlinburg, Tennessee, USA
    Period01/01/1997 → …

    Cite this