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    Entropy generation analysis of an adsorption cooling cycle

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    Type
    Article
    Authors
    Thu, Kyaw
    Kim, Youngdeuk
    Myat, Aung
    Chun, Wongee
    Ng, K. C.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2013-05
    Permanent link to this record
    http://hdl.handle.net/10754/562735
    
    Metadata
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    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.
    Citation
    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
    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.
    Publisher
    Elsevier BV
    Journal
    International Journal of Heat and Mass Transfer
    DOI
    10.1016/j.ijheatmasstransfer.2012.12.055
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijheatmasstransfer.2012.12.055
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC)

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