THERMODYNAMIC ANALYSIS OF A CO2/NH3 CASCADE REFRIGERATION SYSTEM
Nowadays, synthetic refrigerants are being phased out worldwide due to their harmful effects on the ozone layer depletion and global warming. On the other hand, natural substances are being recalled as long-term alternatives for different applications in the refrigeration industry. Moreover, cascade refrigeration systems with CO2 as working fluid in the low temperature stage and NH3 in the high temperature one constitute an interesting choice for low temperature (-40/-55 ℃) cooling applications, such as freezing processes or the storage of frozen products. In the paper, a detailed thermodynamic analysis of a two stages cascade refrigeration system with CO2 and NH3 as working fluids is reported. The influence of the main design parameters on COP and exergetic efficiency is obtained and discussed. Special attention is paid on the determination of the optimum temperature level to carry out the inter-stages heat transfer process. Moreover, useful maps and correlations are proposed to be used in the design and the optimization of these types of refrigeration systems.
A.DOPAZO J.FERN(A)NDEZ-SEARA A.ARIAS J.SIERES F.UH(I)A
Area de Máquinas y Motores Térmicos, E.T.S. Ingenieros Industriales, Universidad de Vigo, Campus Lag Kinarca, Camino do Romeo 25,Vigo, 36213, Espana
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）