Vertical-tube aqueous LiBr falling film absorption using advanced surfaces

William A. Miller, Horacio Perez-Blanco

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    32 Scopus citations

    Abstract

    A heat and mass transfer test stand was fabricated and used to investigate nonisothermal falling film absorption of water vapor into a solution of aqueous lithium bromide. The absorber was made of borosilicate glass for visual inspection of the falling film. Experiments were conducted on internally cooled tubes of about 0.019 m outside diameter and of 1.53 m length. Testing evaluated a single absorber tube's performance at varying operating conditions, namely different cooling-water flow rates, solution flow rates, pressures, temperatures, and concentrations. Advanced surfaces were identified that enhanced absorber load and the mass of absorbed vapor. A pin-fin tube with 6.4-mm pitch absorbed about 225% more mass than did a smooth tube. A grooved tube was the second best performer with 175% enhancement over the smooth tube. Increasing the cooling water flow rate to 1.893×10-4 m3/s caused about a 300% increase in the mass absorbed for the grooved tube compared with the smooth tube. Results showed that the pin-fin tube with 6.4-mm pitch and the grooved tubes may enhance absorption to levels comparable to chemical enhancement in horizontal smooth tube absorbers. Absorber load, the transport coefficients, and pertinent absorption data are presented as functions of dimensionless numbers. These experimental data will prove useful in formulating analytical tools to predict vertical-tube absorber performance.

    Original languageEnglish (US)
    Title of host publicationProceedings of the International Absorption Heat Pump Conference
    PublisherPubl by ASME
    Pages185-202
    Number of pages18
    ISBN (Print)0791806987
    StatePublished - Jan 1 1994
    EventProceedings of the International Absorption Heat Pump Conference - New Orleans, LA, USA
    Duration: Jan 19 1994Jan 21 1994

    Publication series

    NameProceedings of the International Absorption Heat Pump Conference

    Other

    OtherProceedings of the International Absorption Heat Pump Conference
    CityNew Orleans, LA, USA
    Period1/19/941/21/94

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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  • Cite this

    Miller, W. A., & Perez-Blanco, H. (1994). Vertical-tube aqueous LiBr falling film absorption using advanced surfaces. In Proceedings of the International Absorption Heat Pump Conference (pp. 185-202). (Proceedings of the International Absorption Heat Pump Conference). Publ by ASME.