TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Eder, Elias
A1  - Hiller, Sandro
A1  - Brüggemann, Dieter
A1  - Preißinger, Markus
T1  - Characteristics of air-liquid heat and mass transfer in a bubble column humidifier
JF  - Applied Thermal Engineering
N2  - Bubble columns are recently used for the humidification of air in water treatment systems and fuel cells. They are well applicable due to their excellent heat and mass transfer and their low technical complexity. To design and operate such devices with high efficiency, the humidification process and the impact of the operating parameters need to be understood to a sufficient degree. To extend this knowledge, we use a refined and novel method to determine the volumetric air–liquid heat and mass transfer coefficients and the humidifier efficiency for various parametric settings. The volumetric transfer coefficients increase with both of the superficial air velocity and the liquid temperature. It is further shown that the decrease of vapor pressure with an increase of the salinity results in a corresponding decrease in the outlet humidity ratio. In contrast to previous studies, liquid heights smaller than 0.1 m are investigated and significant changes in the humidifier efficiency are seen in this range. We present the expected humidifier efficiency with respect to the superficial air velocity and the liquid height in an efficiency chart, such that optimal operating conditions can be determined. Based on this efficiency chart, recommendations for industrial applications as well as future scientific challenges are drawn.
KW  - Bubble column humidifier
KW  - Humidification-dehumidification
KW  - Desalination
KW  - Air-liquid heat transfer
KW  - Air-liquid mass transfer
Y1  - 2022
SN  - 1359-4311
SS  - 1359-4311
U6  - https://doi.org/10.1016/j.applthermaleng.2022.118240
DO  - https://doi.org/10.1016/j.applthermaleng.2022.118240
VL  - o.Jg.
IS  - Bd. 209
SP  - 12
S1  - 12
ER  -