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Modelling of non-adiabatic capillary tube flows: a simplified approach and comprehensive experimental validation.

Author(s) : HERMES C. J. L., MELO C., GONÇALVES J. M.

Type of article: Article, IJR article

Summary

A simplified computational model for simulating refrigerant flow through capillary tubes is proposed and validated using a dataset composed of more than 1400 experimental data points, including adiabatic flows of refrigerants CFC-12, HCFC-22, HFC-134a, HC-600a, R-404A, R-407C and R-507A, and non-adiabatic flows of refrigerants HFC-134a and HC-600a, in both concentric and lateral capillary tube-suction line heat exchanger configurations. The model is based on the mass, energy and momentum conservation equations written according to their one-dimensional differential formulation. Some simplifications were added to the model in order to improve both numerical stability and computational performance. It was found that the model predicts 91.5% of the measured refrigerant mass flow rate for adiabatic and 79.3% for non-adiabatic flows within an error band of ±10%. Also, the model solves non-adiabatic flows as fast as adiabatic ones.

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Pages: 1358-1367

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Details

  • Original title: Modelling of non-adiabatic capillary tube flows: a simplified approach and comprehensive experimental validation.
  • Record ID : 2009-0138
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 31 - n. 8
  • Publication date: 2008/12

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