Entropy generation analysis of an adsorption cooling cycle

Handle URI:
http://hdl.handle.net/10754/562735
Title:
Entropy generation analysis of an adsorption cooling cycle
Authors:
Thu, Kyaw; Kim, Youngdeuk; Myat, Aung; Chun, Wongee; Ng, K. C.
Abstract:
This paper discusses the analysis of an adsorption (AD) chiller using system entropy generation as a thermodynamic framework for evaluating total dissipative losses that occurred in a batch-operated AD cycle. The study focuses on an adsorption cycle operating at heat source temperatures ranging from 60 to 85 °C, whilst the chilled water inlet temperature is fixed at 12.5 °C,-a temperature of chilled water deemed useful for dehumidification and cooling. The total entropy generation model examines the processes of key components of the AD chiller such as the heat and mass transfer, flushing and de-superheating of liquid refrigerant. The following key findings are observed: (i) The cycle entropy generation increases with the increase in the heat source temperature (10.8 to 46.2 W/K) and the largest share of entropy generation or rate of energy dissipation occurs at the adsorption process, (ii) the second highest energy rate dissipation is the desorption process, (iii) the remaining energy dissipation rates are the evaporation and condensation processes, respectively. Some of the noteworthy highlights from the study are the inevitable but significant dissipative losses found in switching processes of adsorption-desorption and vice versa, as well as the de-superheating of warm condensate that is refluxed at non-thermal equilibrium conditions from the condenser to the evaporator for the completion of the refrigeration cycle. © 2012 Elsevier Ltd. All rights reserved.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Water Desalination & Reuse Research Cntr
Publisher:
Elsevier
Journal:
International Journal of Heat and Mass Transfer
Issue Date:
May-2013
DOI:
10.1016/j.ijheatmasstransfer.2012.12.055
Type:
Article
ISSN:
00179310
Sponsors:
The authors gratefully acknowledge the financial support given by Grant (No. R33-2009-000-101660) from the World Class University (WCU) Project of the National Research Foundation, Korea.
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorThu, Kyawen
dc.contributor.authorKim, Youngdeuken
dc.contributor.authorMyat, Aungen
dc.contributor.authorChun, Wongeeen
dc.contributor.authorNg, K. C.en
dc.date.accessioned2015-08-03T11:03:45Zen
dc.date.available2015-08-03T11:03:45Zen
dc.date.issued2013-05en
dc.identifier.issn00179310en
dc.identifier.doi10.1016/j.ijheatmasstransfer.2012.12.055en
dc.identifier.urihttp://hdl.handle.net/10754/562735en
dc.description.abstractThis paper discusses the analysis of an adsorption (AD) chiller using system entropy generation as a thermodynamic framework for evaluating total dissipative losses that occurred in a batch-operated AD cycle. The study focuses on an adsorption cycle operating at heat source temperatures ranging from 60 to 85 °C, whilst the chilled water inlet temperature is fixed at 12.5 °C,-a temperature of chilled water deemed useful for dehumidification and cooling. The total entropy generation model examines the processes of key components of the AD chiller such as the heat and mass transfer, flushing and de-superheating of liquid refrigerant. The following key findings are observed: (i) The cycle entropy generation increases with the increase in the heat source temperature (10.8 to 46.2 W/K) and the largest share of entropy generation or rate of energy dissipation occurs at the adsorption process, (ii) the second highest energy rate dissipation is the desorption process, (iii) the remaining energy dissipation rates are the evaporation and condensation processes, respectively. Some of the noteworthy highlights from the study are the inevitable but significant dissipative losses found in switching processes of adsorption-desorption and vice versa, as well as the de-superheating of warm condensate that is refluxed at non-thermal equilibrium conditions from the condenser to the evaporator for the completion of the refrigeration cycle. © 2012 Elsevier Ltd. All rights reserved.en
dc.description.sponsorshipThe authors gratefully acknowledge the financial support given by Grant (No. R33-2009-000-101660) from the World Class University (WCU) Project of the National Research Foundation, Korea.en
dc.publisherElsevieren
dc.subjectAdsorptionen
dc.subjectAdsorption chilleren
dc.subjectEntropy generationen
dc.subjectSecond law analysisen
dc.subjectSilica gelen
dc.titleEntropy generation analysis of an adsorption cooling cycleen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentWater Desalination & Reuse Research Cntren
dc.identifier.journalInternational Journal of Heat and Mass Transferen
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, Cheju National University, 66 Jejudaehakno, Jejusi, South Koreaen
kaust.authorThu, Kyawen
kaust.authorKim, Youngdeuken
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