Analysis of a novel refrigeration Carnot-type cycle based on isothermal vapour compression
Résumé
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.
Domaines
Génie des procédésOrigine | Fichiers produits par l'(les) auteur(s) |
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