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R744-R717 Cascade Refrigeration System: Performance Evaluation compared with a HFC Two-Stage System.
- Source :
- Energy Procedia; Feb2012, Vol. 14, p56-65, 10p
- Publication Year :
- 2012
-
Abstract
- Abstract: In this study is presented a thermodynamic analysis of a cascade refrigeration system using as refrigerant carbon dioxide in low-temperature circuit and ammonia in high-temperature circuit. The operating parameters considered in this paper include condensing, evaporating, superheating and subcooling temperatures in the ammonia (R717) hightemperature circuit and in the carbon dioxide (R744) low-temperature circuit. Diagrams of COP versus operating parameters have been obtained. In addition, values for R744-R717 cascade refrigeration system are compared with the values obtained for a partial injection two-stage refrigeration system using the synthetic refrigerant R404A, a nearly azeotropic blend, specially used for commercial refrigeration. Results show that a carbon dioxide-ammonia cascade refrigeration system is an interesting alternative to R404A two-stage refrigeration system for low evaporating temperatures (–30°C ÷ –50°C) in commercial refrigeration for energy, security and environmental reasons. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 18766102
- Volume :
- 14
- Database :
- Supplemental Index
- Journal :
- Energy Procedia
- Publication Type :
- Academic Journal
- Accession number :
- 73579300
- Full Text :
- https://doi.org/10.1016/j.egypro.2011.12.896