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Energy and exergy analysis of an experimental single‐stage heat transformer operating with the water/lithium bromide mixture
Author(s) -
Rivera W.,
Cerezo J.,
Martínez H.
Publication year - 2009
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.1628
Subject(s) - exergy , coefficient of performance , thermodynamics , lithium bromide , transformer , heat capacity , enthalpy , chemistry , materials science , heat pump , heat exchanger , engineering , physics , electrical engineering , voltage
The first and second law of thermodynamics have been used to analyze the performance of an experimental single‐stage heat transformer operating with the water/lithium bromide mixture. Enthalpy coefficients of performance (COP), external coefficients of performance (COP EXT ), exergy coefficient of performance (ECOP), exergy destruction or irreversibility in the system and components ( I ) and the improvement potential (Pot) have been calculated against the gross temperature lift and the main operating temperatures of the system. The results showed that the highest COP, COP EXT and ECOP values are obtained at the highest solution concentrations meanwhile the Pot and the I of the cycle remain almost constant against these parameters. Also it was shown that the COP, COP EXT and ECOP decrease with an increase with the absorber temperature, meanwhile the Pot and the I increase. Moreover, it was observed that in all the cases independently of the operating temperatures of the system, the absorber accounts with most of the half of the total irreversibility in the system. Finally, it was shown that the improvement potential is considerable for the system. Copyright © 2009 John Wiley & Sons, Ltd.