Air heat exchangers with long heat pipes : experiments and predictions

H. Hagens, F.L.A. Ganzevles, C.W.M. Geld, van der, M.H.M. Grooten

    Research output: Contribution to journalArticleAcademicpeer-review

    34 Citations (Scopus)


    This paper presents measurements and predictions of a heat pipe-equipped heat exchanger with two filling ratios of R134a, 19% and 59%. The length of the heat pipe, or rather thermosyphon, is long (1.5 m) as compared to its diameter (16 mm). The airflow rate varied from 0.4 to 2.0 kg/s. The temperatures at the evaporator side of the heat pipe varied from 40 to 70°C and at the condenser part from 20 to 50°C. The measured performance of the heat pipe has been compared with predictions of two pool boiling models and two filmwise condensation models. A good agreement is found. This study demonstrates that a heat pipe equipped heat exchanger is a good alternative for air-air exchangers in process conditions when air-water cooling is impossible, typically in warmer countries.
    Original languageEnglish
    Pages (from-to)2426-2434
    JournalApplied Thermal Engineering
    Issue number14-15
    Publication statusPublished - 2007


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