Abstract
The depression in vapor pressure caused by adding desiccant to liquid water can be regarded as the driving force for the dehumidification process. The vapor pressure depends on the temperature and the concentration. Therefore, the purpose in this study is to discuss the mass transfer performance affected by operating variables and to show that the vapor pressure is a key factor affecting the mass transfer performance for absorbing water vapor by triethylene glycol (TEG) solution. The experimental results showed that the mass transfer coefficients were decreased with increases in the temperature and increased with increases in the concentration, respectively, while the mass transfer coefficients were increased with increases in the vapor pressure depression. Although both the average error is within 5% among the mass transfer correlation involving the vapor pressure and that involving the temperature and the concentration in predicting the mass transfer coefficient, there are just two terms, those are vapor pressure and fluid flow rate, associated with operating variables used in the mass transfer correlation. The depression in vapor pressure was not only proved to be the driving force for absorbing water vapor by a desiccant solution, but also a key factor affecting the mass transfer performance.
Highlights
The vapor pressure will be depressed as addition of a desiccant into pure water
The purpose in this study was to discuss the mass transfer performance and the correlation associated with the temperature, the concentration and the vapor pressure of the desiccant solution to show that the vapor pressure is a key factor affecting the mass transfer performance of an absorption tower
The more water in due solution to the contact between theby desiccant water vapor, which causes a vapor between the bulk and the surface ofof the desiccant solution. increa solution, thepressure higherdifference the vapor pressure
Summary
The vapor pressure will be depressed as addition of a desiccant into pure water. The vapor pressure is a key factor for choosing a desiccant solution to use in the dehumidification system. The driving force, the depression in vapor pressure, for absorption of water vapor from air should be regarded as a variable to discuss the mass transfer performance. The purpose in this study was to discuss the mass transfer performance and the correlation associated with the temperature, the concentration and the vapor pressure of the desiccant solution to show that the vapor pressure is a key factor affecting the mass transfer performance of an absorption tower. The operating variables, and the packing properties were used to develop the mass transfer correlation mostly, the driving force, the depression in vapor pressure, for the dehumidification process was not seen among these correlations. In addition to the relevant dimensionless groups, the ratio of liquid to gas flow rates and the depression in vapor pressure were used to establish the mass transfer correlation in this study
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