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Entropy analysis of wet‐surface cooling system for air flow
Author(s) -
Seppälä Ari,
Lampinen Markku J.
Publication year - 1998
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/(sici)1099-114x(199805)22:6<563::aid-er378>3.0.co;2-0
Subject(s) - heat exchanger , thermodynamics , mass flow rate , mechanics , entropy (arrow of time) , relative humidity , humidity , evaporative cooler , water cooling , chemistry , materials science , physics
A wet‐surface heat‐exchanger, where the effluent air is moistened, is analysed according to a thermodynamic theory and data of experimental tests. An entropy generation function, which takes into account the changes of temperature and humidity of air, is derived. The analyses show that it is thermodynamically possible, without any cooling machine, to achieve extremely large temperature drops. With certain parameters the system results in a maximum rate of entropy generation which is used to analyse differences between two different methods of spraying the moistening water. Approximal limits for the efficient working fluid mass flow value are also given. © 1998 John Wiley & Sons, Ltd.