| Titre : | Condensation of the low GWP refrigerant HFC1234yf inside a brazed plate heat exchanger (2013) |
| Titre original : | Condensation du frigorigène à faible GWP HFC1234yf à l'intérieur d'un échangeur de chaleur à plaques brasées |
| Auteurs : | Giovanni A. Longo, Auteur ; Claudio Zilio, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | International journal of refrigeration (Vol. 36 N° 2 (N° spécial), Mars 2013) |
| Article en page(s) : | pp. 612–621 |
| Note générale : | Refrigeration |
| Langues : | Anglais |
| Tags : | Condensation ; Heat transfer coefficient ; Pressure drop ; Super-heat ; GWP |
| Résumé : | This paper presents the heat transfer coefficients and the pressure drop measured during condensation of the new low Global Warming Potential (GWP) refrigerant HFO1234yf inside a brazed plate heat exchanger: the effects of saturation temperature, refrigerant mass flux and vapour super-heating are investigated. The heat transfer coefficients show weak sensitivity to saturation temperature and great sensitivity to refrigerant mass flux. At low refrigerant mass flux (<20 kg m−2 s−1) the heat transfer coefficients are not dependent on mass flux and condensation is controlled by gravity. For higher refrigerant mass flux (>20 kg m−2 s−1) the heat transfer coefficients depend on mass flux and forced convection condensation occurs. The condensation heat transfer coefficients of super-heated vapour are from 8 to 11% higher than those of saturated vapour. HFO1234yf exhibits heat transfer coefficients lower (10–12%) and frictional pressure drop lower (10–20%) than those of HFC134a under the same operating conditions. |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S0140700713000145 |
