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Author: search.filters.author.Sawardsuk, Prueksa

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    Effect of different desiccant bed designs in a desiccant column on dehumidification performance
    (2022-03-30)
    Sawardsuk, Prueksa
    ;
    Jongyingcharoen, Jiraporn Sripinyowanich
    ;
    Cheevitsopon, Ekkapong
    The main objective of this study was to develop a desiccant column with enhanced air dehumidification. Multilayer desiccant beds with and without air ducts were designed in the column. The desiccant material was silica gel. Air dehumidification characteristics and psychrometric properties of air of various desiccant bed designs were investigated. Dehumidification rate, percentage adsorbed water, desiccant column effectiveness of each design were evaluated at an air flow rate of 1.2 m<sup>3</sup> min<sup>-1</sup>, where the control was a single layer packed bed design. Both kinds of multilayer bed designs (with and without air ducts) exhibited a significantly better dehumidification rate, percentage adsorbed water, and desiccant column effectiveness than the control. The experimental dehumidification psychrometric process was consistent with the theoretical adiabatic dehumidification process. The percentage dehumidification rate as time passed for every multilayer bed design was better than that of the control. The 15-layer bed design with air ducts exhibited the highest values of about 15.73 g water min<sup>-1</sup> dehumidification rate, 51.59% dehumidification efficiency, and 0.998 desiccant column effectiveness. This design shows good dehumidification performance and can be simply applied to many processes requiring air dehumidification.
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    Evaluation of cyclic efficiency of multilayer desiccant bed column
    (2020-09-08)
    Sawardsuk, Prueksa
    ;
    Sripinyowanich Jongyingcharoen, Jiraporn
    ;
    Cheevitsopon, Ekkapong
    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.
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    Experimental investigation of air characteristics during dehumidification in the multilayer desiccant bed column system
    (2018-08-14)
    Sawardsuk, Prueksa
    ;
    Sripinyowanich Jongyingcharoen, Jiraporn
    ;
    Cheevitsopon, Ekkapong
    The gold of this research is to investigate air characteristics during dehumidification process using the multilayer desiccant bed. Silica gel packing in the multilayer column was used as a desiccant material. Airflow direction in the column was designed in a zigzag path passing each desiccant layer. The changes in temperature and relative humidity of exit air were recorded after dehumidification at different airflow rates of 18, 36, and 72 m<sup>3</sup>/h. In the desiccant regeneration process, moisture in silica gel was removed by 85°C of hot air at varied airflow rates. The characteristics of exit air after regeneration were also monitored. The result revealed that air humidity ratio was significantly decreased using multilayer desiccant bed column. The highest rates of air dehumidification and desiccant regeneration were observed in the first 5 min operation. The highest air dehumidification rate was 12.82 g/min at the airflow rate of 72 m<sup>3</sup>/h and the highest regeneration rate of desiccant was 6.70 g/min at the airflow rate of 72 m<sup>3</sup>/h. In addition, the dual column of multilayer desiccant bed can be successfully applied to cyclic operation of dehumidification and regeneration when the cycle time were 5 min and airflow rate 36 and 72 m<sup>3</sup>/h.