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Numerical model for a microchannel gas cooler with any refrigerant circuitry.

Number: pap. ID: 300

Author(s) : MARTÍNEZ-BALLESTER S., CORBERÁN J. M., GONZÁLVEZ-MACIÁ J.

Summary

This work presents a gas cooler model (Fin1Dx3) working with CO2 in transcritical conditions for air-to-refrigerant microchannel heat exchangers with any refrigerant circuitry. The model applies a segment-by-segment discretization to the heat exchanger adding, in each segment, a specific bi-dimensional grid to the fluids flow, fin and tube wall. This methodology allows accounting for: 2D longitudinal heat conduction in the tube wall, the heat conduction between tubes along the fin, and the unmixed air influence on the heat capacity. The paper presents a short description of the heat exchanger discretization and the governing equations employed. The model has been validated against experimental data resulting in predicted capacity errors within ±2%. Differences on prediction results and computational cost were studied and compared with the previous authors’s model, the Fin2D model. Simulation time of the proposed model was reduced one order of magnitude respect the Fin2D’s time.

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Pages: 8 p.

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Details

  • Original title: Numerical model for a microchannel gas cooler with any refrigerant circuitry.
  • Record ID : 30002438
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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