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Caractéristiques de chute de pression et de transfert de chaleur du CO2 surcritique à l'intérieur un tube hélicoïdal.

Heat transfer and pressure drop characteristics of supercritical CO2 in a helically coiled tube.

Auteurs : OH H. K., YU T. G., OH J. T., et al.

Résumé

The heat transfer characteristics of supercritical CO2 during the cooling process in a helically coiled tube were investigated experimentally. The experiments were conducted without oil in a refrigerant loop. The main components of the refrigerant loop are a receiver, a variable speed pump, a mass flowmeter, a pre-heater, a gas cooler (test section) and an isothermal tank. The test section is a double pipe type heat exchanger which has inner helically coiled tube. It was made of a copper tube. The main results were summarized as follows: the heat transfer coefficient of supercritical CO2 increases with decreasing cooling pressure of gas cooler and the heat transfer coefficient increases with increasing the refrigerant mass flux. The experimental data for the study is limited. Therefore, various experiments in a helically coiled tube have to be conducted and it is necessary to develop the reliable and accurate prediction determining the heat transfer and pressure drop of CO2 in a helically coiled tube.

Détails

  • Titre original : Heat transfer and pressure drop characteristics of supercritical CO2 in a helically coiled tube.
  • Identifiant de la fiche : 2007-0080
  • Langues : Anglais
  • Source : ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
  • Date d'édition : 21/05/2006

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