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Document IIF

Condensation dans la zone diphasique et de désurchauffe pour le R1234ze(E), le R134a et le R32 dans des tubes lisses horizontaux.

Condensation in two phase and desuperheating zone for R1234ze(E), R134a and R32 in horizontal smooth tubes.

Auteurs : AGARWAL R., HRNJAK P.

Type d'article : Article, Article de la RIF

Résumé

Condensation is usually assumed to begin when the bulk enthalpy reaches the saturated vapor enthalpy, which leads to discontinuity of heat transfer coefficient calculation in modeling. This paper addresses the discontinuity by showing the presence of condensation in desuperheating region when the wall temperature decreases below the saturation temperature at any operating condition. The experiments have been conducted with R134a, R1234ze(E) and R32 for mass fluxes of 100–300 kgm-2 s-1, saturation temperatures of 30°C–50°C and from x = 0.05 to superheat of 50°C in a horizontal smooth tube with 6.1 mm inner diameter. R134a is observed to have approximately 10% higher and 20% lower HTC compared to R1234ze(E) and R32 respectively. Cavallini correlation predicted the data within an accuracy of 12% while Kondo-Hrnjak correlation predicted HTC for condensation in de-superheating zone within accuracy of 23%.

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Format PDF

Pages : 172-183

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    20 €

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Détails

  • Titre original : Condensation in two phase and desuperheating zone for R1234ze(E), R134a and R32 in horizontal smooth tubes.
  • Identifiant de la fiche : 30013374
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 50
  • Date d'édition : 02/2015

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