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Performance control on adsorption desalination using initial time lag (ITL) of individual beds

Authors
Kim, Albert S.Lee, Ho-SaengMoon, Deok-SooKim, Hyeon-Ju
Issue Date
10월-2016
Publisher
ELSEVIER SCIENCE BV
Keywords
Adsorption desalination; Switching interval; Initial time lag (ITL); Multiple-bed effect; Optimal AD sequence
Citation
DESALINATION, v.396, pp 1 - 16
Pages
16
Journal Title
DESALINATION
Volume
396
Start Page
1
End Page
16
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/650
DOI
10.1016/j.desal.2016.05.004
ISSN
0011-9164
1873-4464
Abstract
This paper introduces a novel time-scheduling scheme for adsorption desalination (AD). Mathematically, a critical bed pressure of the Toth isotherm is defined as the pressure above which the uptake ratio scarcely changes. Heat balance equations of sorption beds for precooling, adsorption, preheating, and desorption are unified into a single equation. This general governing equation is used to model AD systems, which consists of an arbitrary number of bed pairs with specifically preset initial thermal phases. A theoretical minimum of switching interval is derived as a function of thermal properties,of reaction beds and heat exchangers. In the new time scheduling scheme, no bed pairs are in an identical process schedule, because each bed has its initial time lag (ITL) when the operation starts. We found that specific AD performances vary noticeably depending on the ITL values, the number of beds, and more importantly, the number of beds in a time-lag group. There must be an optimal ITL for given operational parameters, which can distinctly increase the water production rate without using extra heat sources. This can dynamically optimize the relative performance of desalination rates and cooling capacities of AD processes. (C) 2016 Elsevier B.V. All rights reserved.
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친환경해양개발연구본부 (해수에너지연구센터)
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