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Second law analysis of heat exchangers / Ahmad Fakheri in Journal of heat transfer, Vol. 132 N° 11 (Novembre 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 11 (Novembre 2010) . - pp. [111802-1/7] Titre : Second law analysis of heat exchangers Type de document : texte imprimé Auteurs : Ahmad Fakheri, Auteur Année de publication : 2010 Article en page(s) : pp. [111802-1/7] Note générale : Physique Langues : Anglais (eng) Mots-clés : Heat  exchangers  Efficiency  Heat  exchanger  efficiency  Entropy  minimization  Exergy  Exergy  maximization Index. décimale : 536 Chaleur. Thermodynamique Résumé : This paper further explores the topic of an ideal heat exchanger, which is still an open question. It is shown that the minimization of entropy production or exergy destruction should not be an objective in heat exchanger design. It is further proven that heat exchanger effectiveness does not correlate with irreversibility. A new performance measure, entropy flux, is introduced and a general expression for its evaluation is presented. It is shown that entropy flux captures many desirable attributes of heat exchangers. For a given effectiveness, a single stream heat exchanger has the absolute maximum entropy flux, and for capacity ratios greater than zero, counterflow has the highest entropy flux, parallel flow the lowest, and the shell and tube heat exchangers are somewhere in between. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Second law analysis of heat exchangers [texte imprimé] / Ahmad Fakheri, Auteur . - 2010 . - pp. [111802-1/7]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 11 (Novembre 2010) . - pp. [111802-1/7] Mots-clés : Heat  exchangers  Efficiency  Heat  exchanger  efficiency  Entropy  minimization  Exergy  Exergy  maximization Index. décimale : 536 Chaleur. Thermodynamique Résumé : This paper further explores the topic of an ideal heat exchanger, which is still an open question. It is shown that the minimization of entropy production or exergy destruction should not be an objective in heat exchanger design. It is further proven that heat exchanger effectiveness does not correlate with irreversibility. A new performance measure, entropy flux, is introduced and a general expression for its evaluation is presented. It is shown that entropy flux captures many desirable attributes of heat exchangers. For a given effectiveness, a single stream heat exchanger has the absolute maximum entropy flux, and for capacity ratios greater than zero, counterflow has the highest entropy flux, parallel flow the lowest, and the shell and tube heat exchangers are somewhere in between. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]