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Heat transfer and pressure drop model of in-tube condensation in a vapor-compression system.

Number: pap. n. 812

Author(s) : XIAO J., HRNJAK P.

Summary

A typical “3-zone” models assume uniform temperature in the cross section of the tube during condensation. The first droplet occurs when the bulk quality is 1. However, as soon as wall temperature drops to the saturation, condensation begins regardless of what the bulk temperature is. The new heat transfer and pressure drop models use “5-zone” approach, seeking to capture the two-phase mechanisms in the condensing superheated (CSH) and condensing subcooled (CSC) regions. Heat transfer coefficient and pressure drop measured in 4 and 6 mm tubes are used to validate the new approach in the range: mass flux from 50 to 400 kg m-2 s-1; heat flux 5 to 15 kW m-2; condensing temperatures 30 and 50°C. The refrigerants explored are R744, R32, R410A, R134a, and R1233zd(E). The new models are more physical and better fit the experimental data than the conventional models, especially in the CSH region. This is because the latent heat and vapor-liquid interaction are present even though the bulk temperature indicates otherwise.

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Pages: 9

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Details

  • Original title: Heat transfer and pressure drop model of in-tube condensation in a vapor-compression system.
  • Record ID : 30026036
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0812

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