Simple analytical model for the design of vertical tube absorbers

V. Patnaik, Horacio Perez-Blanco, W. A. Ryan

    Research output: Contribution to journalConference article

    44 Citations (Scopus)

    Abstract

    The absorption of water vapor in aqueous solutions of lithium bromide is modeled for a falling-film, vertical-tube absorber. The model is based on the solution of three ordinary differential equations to calculate axial solution concentration and temperature distributions and coolant temperature distribution. The heat and mass transfer coefficients employed in the equations are extracted from the literature, incorporating recent information on wavy-laminar flows. Under certain conditions, the numerical solution exhibits instabilities in the entrance region of the absorber tube, which are corrected by the introduction of a dampening factor incorporating relevant thermophysical properties. The usefulness of the model for generating absorber performance charts is demonstrated.

    Original languageEnglish (US)
    Pages (from-to)69-80
    Number of pages12
    JournalASHRAE Transactions
    Volume99
    Issue numberpt 2
    StatePublished - Dec 1 1993
    EventProceedings of the 1993 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. - Denver, CO, USA
    Duration: Jun 27 1993Jun 30 1993

    Fingerprint

    Analytical models
    Temperature distribution
    Laminar flow
    Ordinary differential equations
    Coolants
    Heat transfer coefficients
    Water vapor
    Lithium
    Thermodynamic properties
    Mass transfer

    All Science Journal Classification (ASJC) codes

    • Building and Construction
    • Mechanical Engineering

    Cite this

    Patnaik, V., Perez-Blanco, H., & Ryan, W. A. (1993). Simple analytical model for the design of vertical tube absorbers. ASHRAE Transactions, 99(pt 2), 69-80.
    Patnaik, V. ; Perez-Blanco, Horacio ; Ryan, W. A. / Simple analytical model for the design of vertical tube absorbers. In: ASHRAE Transactions. 1993 ; Vol. 99, No. pt 2. pp. 69-80.
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    Patnaik, V, Perez-Blanco, H & Ryan, WA 1993, 'Simple analytical model for the design of vertical tube absorbers', ASHRAE Transactions, vol. 99, no. pt 2, pp. 69-80.

    Simple analytical model for the design of vertical tube absorbers. / Patnaik, V.; Perez-Blanco, Horacio; Ryan, W. A.

    In: ASHRAE Transactions, Vol. 99, No. pt 2, 01.12.1993, p. 69-80.

    Research output: Contribution to journalConference article

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    N2 - The absorption of water vapor in aqueous solutions of lithium bromide is modeled for a falling-film, vertical-tube absorber. The model is based on the solution of three ordinary differential equations to calculate axial solution concentration and temperature distributions and coolant temperature distribution. The heat and mass transfer coefficients employed in the equations are extracted from the literature, incorporating recent information on wavy-laminar flows. Under certain conditions, the numerical solution exhibits instabilities in the entrance region of the absorber tube, which are corrected by the introduction of a dampening factor incorporating relevant thermophysical properties. The usefulness of the model for generating absorber performance charts is demonstrated.

    AB - The absorption of water vapor in aqueous solutions of lithium bromide is modeled for a falling-film, vertical-tube absorber. The model is based on the solution of three ordinary differential equations to calculate axial solution concentration and temperature distributions and coolant temperature distribution. The heat and mass transfer coefficients employed in the equations are extracted from the literature, incorporating recent information on wavy-laminar flows. Under certain conditions, the numerical solution exhibits instabilities in the entrance region of the absorber tube, which are corrected by the introduction of a dampening factor incorporating relevant thermophysical properties. The usefulness of the model for generating absorber performance charts is demonstrated.

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    Patnaik V, Perez-Blanco H, Ryan WA. Simple analytical model for the design of vertical tube absorbers. ASHRAE Transactions. 1993 Dec 1;99(pt 2):69-80.