Evaluation of a dehumidifier with adsorbent coated heat exchangers for tropical climate operations

Handle URI:
http://hdl.handle.net/10754/623211
Title:
Evaluation of a dehumidifier with adsorbent coated heat exchangers for tropical climate operations
Authors:
Oh, Seung Jin; Ng, Kim Choon ( 0000-0003-3930-4127 ) ; Chun, Wongee; Chua, Kian Jon Ernest
Abstract:
This paper presents the evaluation of a solid desiccant dehumidifier equipped with adsorbent powder coated heat exchangers (PCHX). The main component of the solid desiccant dehumidifier includes two heat exchangers that are coated with silica gel RD type powders in order to increase water adsorption uptake by improving its heat and mass transfer. A series of experiment are conducted to evaluate two key performance indices, namely, moisture removal capacity (MRC) and thermal coefficient performance (COPth), under various hot and humid air conditions. Conventional granular adsorbent packed heat exchangers (GPHX) are employed to benchmark the performance of the adsorbent coated heat exchanger (PCHX). Results reveal that the PCHX exhibits higher uptake performance due to better heat and mass transfer. It is found that the moisture removal capacity increases from 7.4 g/kg to 11.0 g/kg with air flow rates of 35 kg/h, resulting in the extended contact time of the water vapor. Experiments also demonstrate that the moisture removal capacity is highly affected by inlet air humidity ratio. In addition, marked improvement in COPth can be achieved by a lowered hot water regeneration temperature.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC)
Citation:
Oh SJ, Ng KC, Chun W, Chua KJE (2017) Evaluation of a dehumidifier with adsorbent coated heat exchangers for tropical climate operations. Energy. Available: http://dx.doi.org/10.1016/j.energy.2017.02.169.
Publisher:
Elsevier BV
Journal:
Energy
Issue Date:
10-Mar-2017
DOI:
10.1016/j.energy.2017.02.169
Type:
Article
ISSN:
0360-5442
Sponsors:
The authors gratefully acknowledged the financial support from National Research Foundation of Singapore (grant no. R-265-000-466-281) and Korean National Research Foundation (grant no. 2014R1A2A1A01006421).
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0360544217303523
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorOh, Seung Jinen
dc.contributor.authorNg, Kim Choonen
dc.contributor.authorChun, Wongeeen
dc.contributor.authorChua, Kian Jon Ernesten
dc.date.accessioned2017-04-13T11:51:01Z-
dc.date.available2017-04-13T11:51:01Z-
dc.date.issued2017-03-10en
dc.identifier.citationOh SJ, Ng KC, Chun W, Chua KJE (2017) Evaluation of a dehumidifier with adsorbent coated heat exchangers for tropical climate operations. Energy. Available: http://dx.doi.org/10.1016/j.energy.2017.02.169.en
dc.identifier.issn0360-5442en
dc.identifier.doi10.1016/j.energy.2017.02.169en
dc.identifier.urihttp://hdl.handle.net/10754/623211-
dc.description.abstractThis paper presents the evaluation of a solid desiccant dehumidifier equipped with adsorbent powder coated heat exchangers (PCHX). The main component of the solid desiccant dehumidifier includes two heat exchangers that are coated with silica gel RD type powders in order to increase water adsorption uptake by improving its heat and mass transfer. A series of experiment are conducted to evaluate two key performance indices, namely, moisture removal capacity (MRC) and thermal coefficient performance (COPth), under various hot and humid air conditions. Conventional granular adsorbent packed heat exchangers (GPHX) are employed to benchmark the performance of the adsorbent coated heat exchanger (PCHX). Results reveal that the PCHX exhibits higher uptake performance due to better heat and mass transfer. It is found that the moisture removal capacity increases from 7.4 g/kg to 11.0 g/kg with air flow rates of 35 kg/h, resulting in the extended contact time of the water vapor. Experiments also demonstrate that the moisture removal capacity is highly affected by inlet air humidity ratio. In addition, marked improvement in COPth can be achieved by a lowered hot water regeneration temperature.en
dc.description.sponsorshipThe authors gratefully acknowledged the financial support from National Research Foundation of Singapore (grant no. R-265-000-466-281) and Korean National Research Foundation (grant no. 2014R1A2A1A01006421).en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0360544217303523en
dc.subjectDehumidifieren
dc.subjectAdsorbent coated heat exchangeren
dc.subjectSilica gelen
dc.subjectMoisture removal capacityen
dc.subjectThermal coefficient performanceen
dc.titleEvaluation of a dehumidifier with adsorbent coated heat exchangers for tropical climate operationsen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalEnergyen
dc.contributor.institutionDepartment of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singaporeen
dc.contributor.institutionDepartment of Nuclear and Energy Engineering, Jeju National University, 1 Ara 1 dong, Jeju 63243, South Koreaen
kaust.authorNg, Kim Choonen
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