PERFORMANCE COMPARISON OF CASCADE AND TWO-STAGE REFRIGERATION CYCLES USING NATURAL REFRIGERANTS

摘要：

The present paper aims to compare performances of cascade refrigeration systems with two-stage refrigeration systems using exergy method. The considered systems use natural refrigerants, namely carbon dioxide (R744), ammonia (R717) and propane (R290). R744 is used in the low stage and R717 or R290 in the high stage, while the two-stage system uses only R717 or R290. Comparison results show that for a given refrigeration capacity, evaporator and condenser temperature and cascade-condenser temperature, the compressor of R744 in the cascade cycle is more compact than those of R290 and R717 in the two-stage cycles. While cascade system provides lower exergy efficiency for both the two blends of refrigerants R744/R290 and R744/R717.

作者: A.Ouadha1 C.Haddad1 M.En-nacer O.Imine

作者单位: Laboratoire de Mécanique Appliquée, USTOran, BP 1505 El-M’naouar,31000 Oran, Algérie Pratt & Whitney Canada Corp., 1000 Marie-Victorin (01SA4), Longueil,Quebec, Canada J4G 1A1

会议类型: 国际会议

会议名称: The 22nd International Congress of Refrigeration(第22届国际制冷大会)

会议地点: 北京

会议语种:英文

在线出版日期: 2007-08-21（万方平台首次上网日期，不代表论文的发表时间）