Abstract
The main objective was to evaluate cyclic efficiency of a multilayer desiccant bed column. The experimental setup consisted of an air humidifier unit, a heating unit for regeneration, and the desiccant bed column with 15 layers. An airflow rate of 2.4 m3/min with the humidity ratio of 20 g water/kg dry air was used in this study. The results showed that the highest dehumidification rate of 21 g water/min was found at the beginning of the dehumidification process. During the regeneration process, the highest regeneration rate was 39 g water/min when regenerating the desiccant at a temperature of 90°C. For cyclic operation process, the cyclic efficiencies were 11% and 7% at the regeneration temperatures of 70°C and 90°C, respectively. The cyclic efficiency was dependent on the regeneration temperature.
Highlights
Methods to dehumidify air are mainly into 2 ways: the moisture are condensed on the surface of cooling coil which is the refrigeration method, and the moisture are absorbed by desiccant material which is sorption method
It can be seen that the humidity ratio of outlet air sharply decreased at the beginning of dehumidification period
It significantly increased within the 30 min of process, and slowly converges to a humidity ratio of inlet air after prolonged dehumidification
Summary
Methods to dehumidify air are mainly into 2 ways: the moisture are condensed on the surface of cooling coil which is the refrigeration method, and the moisture are absorbed by desiccant material which is sorption method. Ramzy et al [9] studied parameters that affect the cyclic operation of radial flow desiccant bed dehumidifier. It found that humidity of dehumidified air decrease with increase in regeneration temperature. Increasing temperature of regeneration air exceeds the optimum value does not result in the better dehumidification rate and the cycle efficiency decreases. Rogala et al [10] studied adsorption and desorption characteristics of the fluidised desiccant cooler They reported that the switching time between adsorption and desorption had a greater impact on the water uptake of bed. The cycle time of multilayer desiccant bed column was estimated by the experimental data from single blow of dehumidification and regeneration. The cyclic operation was tested and monitor air humidity ratio of outlet air
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