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Advanced Open-Cycle Desiccant Cooling System
Abstract
The concept of staged regeneration as means of improving
the desiccant cooling system performance is the subject of investigation
in this study. In the staged regeneration, the regeneration
section of desiccant dehumidifier is divided into two parts and
only the latter fraction is subjected to the desorption air stream
which has been heated to the desired regeneration temperature.
In the present work, the mathematical model describing the
heat and mass transfer processes that occur during sorption of
moisture in the desiccnnt dehumidifier includes both the gas-side
(film) and solid-side resistances for heat and mass transports. The
moisture diffusion in the desiccant material is expressed by gas-phase
diffusion and surface diffusion. Effects of several
parameters on the performance of desiccant cooling system with
staged regeneration are investigated and the results of present
model are compared with those of the lumped-resistance model.
Results of this study show that coefficient of perfomnnce of
the desiccant cooling system can be substantially improved by
using the staged regeneration concept. There is an optimum stage
fraction and optimum cycle time for given system parmeters and
operating conditions. The results also indicate that the cooling
system performance is higher than that predicted by the lumped-resistance
model.
Citation
Ko, Y. J.; Charoensupaya, D.; Lavan, Z. (1989). Advanced Open-Cycle Desiccant Cooling System. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /6568.