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Modélisation numérique des performances en dehors des conditions de conception d'un cycle à éjecteur diphasique au CO2 transcritique.

Numerical modeling of the off-design performance of a transcritical CO2 two-phase ejector cycle.

Numéro : pap. 1084

Auteurs : LAWRENCE N., ELBEL S.

Résumé

Ejector assisted cycles are known to offer significant COP and capacity improvements, especially for transcritical CO2 systems, when operated at the ejector design conditions. However, significant deviation from design conditions can lead to poor ejector and cycle performance. In this paper, a numerical model of a transcritical CO2 ejector cycle accounting for off-design ejector performance is developed. Experimental data from a CO2 ejector cycle, taken over a range of compressor speeds and ambient temperatures, is used to develop empirical models for the ejector and compressor. The evaporator in the system is a counterflow, microchannel heat exchanger and is simulated using a finite difference model capable of accounting for the heat transfer and pressure drop throughout the heat exchanger. The models of the individual components and cycle are validated using experimental data; good agreement between model and experiment is obtained.

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Pages : 8 p.

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    20 €

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Détails

  • Titre original : Numerical modeling of the off-design performance of a transcritical CO2 two-phase ejector cycle.
  • Identifiant de la fiche : 30019159
  • Langues : Anglais
  • Source : 12th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2016). Proceedings. Édimbourg, United Kingdom, August 21st-24th 2016.
  • Date d'édition : 21/08/2016
  • DOI : http://dx.doi.org/10.18462/iir.gl.2016.1084

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