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Conception thermodynamique optimale d'échangeurs de chaleur utilisés dans un réfrigérateur à cycle irréversible.

Thermodynamic optimal design of heat exchangers for an irreversible refrigerator.

Auteurs : GRAZZINI G., RINALDI R.

Type d'article : Article

Résumé

In this paper the maximum coefficient of performance (COP) is obtained for an irreversible inverse Rankine cycle refrigerator working with then environmentally friendly fluid R134a. Heat transfer irreversibilities in the shell-and-tube heat exchangers and external friction losses in the water streams are considered, ignoring only the internal pressure drop of vapor. A simulation program was developed to search the maximum COP at given external fluid temperatures, as a function of mass flows, dimensions and temperature differences in the heat exchangers. The proposed method provides the refrigerating fluid evaporating and condensing pressures, the heat exchanger dimensions, and the water flow rates for a given cooling power with predefined inlet temperatures of cold and hot water streams. The heat exchanger area closely conditions the COP.

Détails

  • Titre original : Thermodynamic optimal design of heat exchangers for an irreversible refrigerator.
  • Identifiant de la fiche : 2002-0691
  • Langues : Anglais
  • Source : International Journal of thermal Sciences - vol. 40 - n. 2
  • Date d'édition : 02/2001

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