Performance degradation of a vapor compression refrigeration system under fouled conditions / Bilal Ahmed Qureshi in International journal of refrigeration, Vol. 34 N° 4 (Juin 2011)  

Performance degradation of a vapor compression refrigeration system under fouled conditions = Détérioration de la performance d'un système frigorifique à compression de vapeur sous des conditions d'encrassement [texte imprimé] / Bilal Ahmed Qureshi, Auteur ; Syed M. Zubair, Auteur . - 2011 . - pp. 1016-1027.
Génie Mécanique
Langues : Anglais (eng)
in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 1016-1027

Mots-clés :	Vapour compression Refrigeration Performance Degradation Fouling R134a R407C R410A R404A R717 R290
Index. décimale :	621.5 Energie pneumatique. Machinerie et outils. Réfrigération
Résumé :	Performance degradation due to fouling in a vapor compression cycle is investigated for various applications. Considering the first set of refrigerants i.e. R134a, R410A and R407C, from a first law standpoint, the COP indicates that R134a always performs better unless only the evaporator is being fouled. In contrast to this, from a second-law standpoint, the second-law efficiency indicates that R134a performs the best in all cases. Considering the second set of refrigerants i.e. R717, R404A and R290, from a first law standpoint, the COP indicates that R717 always performs better unless only the evaporator is being fouled. In contrast to this, from a second-law standpoint, the second-law efficiency indicates that R717 performs the best in all cases. Volumetric efficiency of R410A and R717 remained the highest under the respective conditions studied. Furthermore, performance degradation of the evaporator often has a larger effect on compressor power requirement while that of the condenser has an overall larger effect on the COP. A new performance degradation law is presented in light of the data generated, which can reduce the amount of experimentation and help predict relevant quantities of the refrigeration system.
DEWEY :	621.5
ISSN :	0140-7007
En ligne :	http://www.sciencedirect.com/science/article/pii/S0140700711000582