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Mesurage du coefficient de transfert de chaleur lors de l’ébullition nucléée libre de R1234yf à saturation.

Measurement of pool nucleate boiling heat transfer coefficient of R1234yf at saturation.

Numéro : pap. n. 203

Auteurs : TAKAISHI Y., KATO K.

Résumé

This paper describes measurements of the pool nucleate boiling heat transfer coefficient of R1234yf, which has been used as a low GWP alternative for R134a. The measurements were conducted by use of a horizontal platinum heating wire under the pool, saturated conditions. The boiling curves were obtained for heat fluxes up to 220 kW/m2 and temperatures between 273 K and 294 K whose corresponding saturation pressures lie between 318 kPa and 613 kPa. The boiling data reveal that the heat transfer coefficient increases in proportion to the heat flux to the power of 0.712, and it is also proportional to the saturated pressure to the power of 0.476. The comparison with the similarly measured heat transfer coefficients of R134a indicates that the heat transfer coefficients of R1234yf are slightly less than those of R134a, but their deviations from R134a do not exceed -5%.

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Pages : 6

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Détails

  • Titre original : Measurement of pool nucleate boiling heat transfer coefficient of R1234yf at saturation.
  • Identifiant de la fiche : 30025963
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0203

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