Adiabatic Air Dehumidification in Laminar Flow Desiccant Matrices

    Research output: NRELTechnical Report


    Adiabatic step transient heat- and mass-transfer and pressure drop experimental data were obtained for a dehumidifier test matrix that contained microbead silica gel desiccant in a parallel-plate geometry. The data were analyzed and compared with the results of two other test dehumidifiers: a parallel-plate matrix using crushed silica gel, and a staggered, parallel strip matrix using microbeadsilica gel. The analysis showed that the overall heat- and mass-transfer Nusselt numbers of the staggered, parallel-strip matrix were about 70% to 80% larger than those of the parallel-plate matrices. It also showed that the solid-side resistance to moisture diffusion in the smaller microbead silica gel was about 45% less than that of crushed silica gel because the particle size was 60% smaller.The ratio of heat- or mass-transfer coefficient to pressure drop of the microbead-silica gel staggered, parallel-strip matrix was higher than the other two test dehumidifiers. Based on these findings, a dehumidifier using microbead silica gel in a staggered, parallel-strip geometry can be made more compact than the other combinations.
    Original languageAmerican English
    Number of pages12
    StatePublished - 1987

    NREL Publication Number

    • NREL/TP-252-3145


    • adiabatic
    • dehumidification
    • microbead silica-gel


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