Performance Investigation of the Periodic Operative Total Heat Exchanger with High Temperature Regeneration
Date Issued
2012
Date
2012
Author(s)
Chou, Mu-Hsien
Abstract
This research presents an experimental study of moist air dehumidification system developing different desiccant materials, and incorporates regenerative total heat exchanger with periodic flow. Heat and mass exchanger that utilize honey-comb type of silica, silica gel and active alumina packed-bed have been considered as possibilities, in addition to discussing the effect of vertical total heat exchanger and thinned packed-bed.
This study provides adsorption/desorption characteristics of desiccant materials and the system is well instrumented to measure the inlet and outlet air parameters during the experiments.
It found out that active alumina packed-bed has the highest value of adsorption rate while honey-comb type of silica has the best desorption rate.
During periodic operations, the performance features of the sensible heat effectiveness of all kinds of desiccant materials decay as the time increased. Honey-comb type of silica has the highest value 84.8%. The highest value of silica gel is 69.6% but 57.1% for active alumina packed-bed. In the case of latent heat effectiveness, honey-comb type of silica has the highest value 74.2% at 5 minute. Silica gel packed-bed has the highest value 70.0% at 8 minute yet active alumina packed-bed has highest value 55.4% at 20 minute. Whether the laid way of total heat exchanger is vertical or horizontal, it not affects the result of experiment. The thinner packed-bed has the lower sensible heat effectiveness but higher latent heat effectiveness. In practical operation at 10 ping room, the total heat exchanger dehumidifies 2 humidity ratio.
Subjects
Total heat exchanger
Packed-bed
Periodic Time
Effectiveness
Type
thesis
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