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Document IIF

Sensibilité et conception d'un système de chauffage et de refroidissement au CO2 transcritique.

Sensitivity and design of a transcritical CO2 cooling and heating system.

Numéro : pap. n. 170

Auteurs : NGUYEN C., VEJE C., WILLATZEN M., et al.

Résumé

This paper presents a theoretical design study of a transcritical CO2 heat pump system for simultaneous cooling and heating. The heat pump model consists of the components: compressor, internal heat exchanger, valve, evaporator and gas cooler. The evaporator and the gas cooler are both water coupled intended for district cooling and heating respectively. Initially a thermodynamic cycle analysis has been done on the system followed by a heat transfer analysis of the heat exchangers using finite difference models. The main subject of this paper is an investigation of the effects that parameter uncertainties have on the design results: thermodynamic performance expressed by coefficient of performance (COP) and heat exchanger sizes expressed by weight. The parameters to be investigated are the compressor isentropic efficiency, effectiveness of the internal heat exchanger and pressure drops in the heat exchangers. The results show that COP is particular sensitive to the pinch temperature in the gas cooler and to the compressor isentropic efficiency but not to pressure loss. However it is found that the heat exchanger weights are very sensitive to pressure loss. The thermodynamic and heat exchanger models proposed in this study are self-contained and forms the basis for an economic analysis and optimization in future work.

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Détails

Titre original : Sensitivity and design of a transcritical CO2 cooling and heating system.
Identifiant de la fiche : 30004312
Langues : Anglais
Source : 10^th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
Date d'édition : 25/06/2012

Liens

Voir les traductions : Sensibilidad y diseño de un sistema de refrigeración y calefacción de CO2 transcrítico.

Voir d'autres communications du même compte rendu (142)
Voir le compte rendu de la conférence

Indexation

Thèmes : Techniques des pompes à chaleur;
Thermodynamique et changement d’état;
Evaporateurs, condenseurs et autres échangeurs thermiques;
CO2;
Efficacité energétique, économie d'énergie
Mots-clés : Refroidissement; R744; Pompe à chaleur; Modélisation; Cycle transcritique; COP; Chauffage; Échangeur de chaleur; CO2