Experimental evaluation of the use of homogeneous and slip-flow two-phase dynamic models in evaporator modelling

Arne Jakobsen, Jesper Antonius, Hans Jørgen Høgaard Knudsen

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

    Abstract

    Distributed dynamic models of a simple coaxial-type evaporator are implemented in the simulation tool Sinda/Fluint. In order to obtain data for model validation an experimental set-up is built, where dynamic responses to changes in inflow and/or outflow of refrigerant are recorded. Model validation shows that the dynamic response of the homogeneous model is too fast whereas the simulation results based on the slip-flow model agrees very well with the experimental results. Another difference in the results from the two types of models is the estimation of charge. The charge calculated by the use of the homogeneous model is approximately a factor 3 less than the charge calculated using the slip-flow model.The overall conclusion is that when one wants to investigate the dynamic behaviour due to the movement and amount of the refrigerant in the evaporator, then it is needed to use a slip-flow two-phase model as the homogenous model produce a too fast response.
    Original languageEnglish
    Title of host publicationExperimental evaluation of the use of homogeneous and slip-flow two-phase dynamic models in evaporator modelling
    Publication date1999
    Publication statusPublished - 1999
    Event20th International Congress of Refrigeration - Sydney, Australia
    Duration: 19 Sep 199924 Sep 1999

    Conference

    Conference20th International Congress of Refrigeration
    CountryAustralia
    CitySydney
    Period19/09/199924/09/1999

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