Analysis of a novel refrigeration Carnot-type cycle based on isothermal vapour compression

Cyril Toublanc (1, 2) , M. Clausse (3)

1 ONIRIS - École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique
2 GEPEA-OSE - Optimisation - Système - Energie
3 CETHIL - Centre de Thermique de Lyon

Design Compression system Thermodynamic cycle Carnot Modelling Ammonia Carbon dioxide Trans-critical cycle Comparison Performance COP a b s t r a c t A novel Carnot-type cycle is proposed to reach high performances for sub-critical and trans-critical applications. Two natural fluids, ammonia and carbon dioxide each one corresponding to one of the application, were chosen. Compared to conventional cycles, the Carnot-type cycle leads to COP increase by 4–70% depending on the application. For the most suitable case (CO 2), a simpler design resulting from a trade-off between complexity and performances still exhibits high performances (92.5% of COP Carnot vs. 95.4% for Carnot-type cycle). Compared to conventional one, this simpler design appears to be more sensitive to the expander efficiency but still achieves higher performances: 80% vs. 50% of COP Carnot. The impact of the compression cooling efficiency was explored too. With a temperature pinch equal to 20 K, the performances are still better than those of the conventional one (þ21% of COP) despite a decrease by 24% of the COP.

Mots clés: compression system; comparison; ammonia; Modelling; Thermodynamic cycle; Design; COP; Performance; Refrigeration system

Mots clés: Cycle trans-critique; Dioxyde de carbone; Ammoniac; Modélisation; Carnot; Conception; Système à compression; Cycle Thermodynamique; Comparaison; Système frigorifique

Domaines: Génie des procédés

Cyril Toublanc, M. Clausse. Analysis of a novel refrigeration Carnot-type cycle based on isothermal vapour compression. International Journal of Refrigeration, 2008, 31 (7), pp.1190 - 1197. ⟨10.1016/j.ijrefrig.2008.02.008⟩. ⟨hal-01824363⟩