[article] 
inRevue internationale du froid > vol 34, issue 1 (janvier 2011) . - pp. 234-242

Titre :	Performance limit for economized cycles with continuous refrigerant injection
Titre original :	Limites de la performance des cycles à économiseur avec injection continue de frigorigène
Type de document :	texte imprimé
Année de publication :	2012
Article en page(s) :	pp. 234-242
Langues :	Anglais (eng) Français (fre)
Catégories :	621.5 : Technique pneumatique, du vide, des basses températures
Mots-clés :	Système; Multiétagé; Modélisation; Injection; Économies d'énergie; Cycle-thermodynamique
Index. décimale :	621.56 Technique des basses températures : réfrigération, pompe à chaleur
Résumé :	While economizing can improve the performance of vapor compression cycles, the cost of multi-stage compressors has limited its implementation to large-scale applications. However, the development of compressors with injection ports presents new opportunities for economizing in smaller-scale applications. In addition to eliminating the need for a costly multi-stage compressor, multiple injection ports can be added at relatively low cost to further improve cycle performance. In the current study, a model was developed to study the effect of the number of injection ports on performance and determine the limit to performance with injection. The model predicts that continuous injection, in which economized refrigerant is injected at an infinite number of ports to maintain saturated vapor in the compressor, provides very significant performance improvements for air-conditioning and refrigeration applications. At standard operating conditions, the COP increases between 18% and 51% depending on the application, with higher temperature lift cycles benefiting most significantly.

[article] Performance limit for economized cycles with continuous refrigerant injection = Limites de la performance des cycles à économiseur avec injection continue de frigorigène [texte imprimé] . - 2012 . - pp. 234-242.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > vol 34, issue 1 (janvier 2011) . - pp. 234-242

Catégories :	621.5 : Technique pneumatique, du vide, des basses températures
Mots-clés :	Système; Multiétagé; Modélisation; Injection; Économies d'énergie; Cycle-thermodynamique
Index. décimale :	621.56 Technique des basses températures : réfrigération, pompe à chaleur
Résumé :	While economizing can improve the performance of vapor compression cycles, the cost of multi-stage compressors has limited its implementation to large-scale applications. However, the development of compressors with injection ports presents new opportunities for economizing in smaller-scale applications. In addition to eliminating the need for a costly multi-stage compressor, multiple injection ports can be added at relatively low cost to further improve cycle performance. In the current study, a model was developed to study the effect of the number of injection ports on performance and determine the limit to performance with injection. The model predicts that continuous injection, in which economized refrigerant is injected at an infinite number of ports to maintain saturated vapor in the compressor, provides very significant performance improvements for air-conditioning and refrigeration applications. At standard operating conditions, the COP increases between 18% and 51% depending on the application, with higher temperature lift cycles benefiting most significantly.