Entropy generation analysis of an adsorption cooling cycle

dc.contributor.authorThu, Kyaw
dc.contributor.authorKim, Youngdeuk
dc.contributor.authorMyat, Aung
dc.contributor.authorChun, Wongee
dc.contributor.authorNg, K. C.
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.contributor.institutionDepartment of Mechanical Engineering, National University of Singapore, 9 engineering drive 1, Singapore 117576, Singapore
dc.contributor.institutionDepartment of Nuclear and Energy Engineering, Cheju National University, 66 Jejudaehakno, Jejusi, South Korea
dc.date.accessioned2015-08-03T11:03:45Z
dc.date.available2015-08-03T11:03:45Z
dc.date.issued2013-05
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.
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.
dc.identifier.citationThu, K., Kim, Y.-D., Myat, A., Chun, W. G., & NG, K. C. (2013). Entropy generation analysis of an adsorption cooling cycle. International Journal of Heat and Mass Transfer, 60, 143–155. doi:10.1016/j.ijheatmasstransfer.2012.12.055
dc.identifier.doi10.1016/j.ijheatmasstransfer.2012.12.055
dc.identifier.issn00179310
dc.identifier.journalInternational Journal of Heat and Mass Transfer
dc.identifier.urihttp://hdl.handle.net/10754/562735
dc.publisherElsevier BV
dc.subjectAdsorption
dc.subjectAdsorption chiller
dc.subjectEntropy generation
dc.subjectSecond law analysis
dc.subjectSilica gel
dc.titleEntropy generation analysis of an adsorption cooling cycle
dc.typeArticle
display.details.left<span><h5>Type</h5>Article<br><br><h5>Authors</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.author=Thu, Kyaw,equals">Thu, Kyaw</a><br><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.author=Kim, Youngdeuk,equals">Kim, Youngdeuk</a><br><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.author=Myat, Aung,equals">Myat, Aung</a><br><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.author=Chun, Wongee,equals">Chun, Wongee</a><br><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.author=Ng, K. C.,equals">Ng, K. C.</a><br><br><h5>KAUST Department</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.department=Biological and Environmental Sciences and Engineering (BESE) Division,equals">Biological and Environmental Sciences and Engineering (BESE) Division</a><br><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.department=Water Desalination and Reuse Research Center (WDRC),equals">Water Desalination and Reuse Research Center (WDRC)</a><br><br><h5>Date</h5>2013-05</span>
display.details.right<span><h5>Abstract</h5>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.<br><br><h5>Citation</h5>Thu, K., Kim, Y.-D., Myat, A., Chun, W. G., & NG, K. C. (2013). Entropy generation analysis of an adsorption cooling cycle. International Journal of Heat and Mass Transfer, 60, 143–155. doi:10.1016/j.ijheatmasstransfer.2012.12.055<br><br><h5>Acknowledgements</h5>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.<br><br><h5>Publisher</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.publisher=Elsevier BV,equals">Elsevier BV</a><br><br><h5>Journal</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.journal=International Journal of Heat and Mass Transfer,equals">International Journal of Heat and Mass Transfer</a><br><br><h5>DOI</h5><a href="https://doi.org/10.1016/j.ijheatmasstransfer.2012.12.055">10.1016/j.ijheatmasstransfer.2012.12.055</a></span>
kaust.personThu, Kyaw
kaust.personKim, Youngdeuk
orcid.authorThu, Kyaw
orcid.authorKim, Youngdeuk
orcid.authorMyat, Aung
orcid.authorChun, Wongee
orcid.authorNg, K. C.
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