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Prediction model of two-phase flow distribution in a vertical header.

Number: 0272

Author(s) : ONAKA Y., ADACHI R., KISHIDA N., MATSUMOTO T.

Summary

In order to reduce refrigerant charge, the sizes of tubes found in heat exchangers are being reduced and the number of heat exchanger paths for refrigerant has been increasing. Therefore, the design technologies of vertical headers have recently been garnering much attention. In this study, a nodal/zonal lumped parameter prediction model for the distribution characteristics of a vertical header having more than 30 branches with a Liquid Branch Limit (LBL) model based on the flooding equation, has been developed to improve prediction accuracy for the distribution characteristics when the liquid refrigerant mass flow does not reach the top of the vertical header. The comparison of experimental and calculated temperature distribution at evaporator outlets has been performed to evaluate the accuracy of predictions. In addition, a new T-junction prediction model which takes into consideration flow patterns and liquid film thickness, has been developed so that it can be applied to the vertical header of branch tube intrusion structures in accordance with the T-junction experimental data pertaining to various intrusion depths.

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Pages: 12 p.

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Details

  • Original title: Prediction model of two-phase flow distribution in a vertical header.
  • Record ID : 30031595
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0272

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