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A new correlation to predict the heat transfer rate of natural-draft wire-on-tube condensers.

Number: pap. n. 184

Author(s) : ESPÍNDOLA R., MELO C.

Summary

In order to improve performance, manufacturers of household refrigerators are constantly updating the design of natural-draft wire-on-tube condensers. As a consequence, the geometrical application range of the current correlations became outdated. In this context, the aim of this work was to extend the limits of the existing mathematical models by proposing a new and updated correlation to predict the air-side heat transfer coefficient. To this end, a test bench was designed and built to circulate hot brine through the condenser tubes, controlling the inlet temperature and the mass flow rate. Fifty-four condenser samples with distinct design parameters, such as height, tube and wire diameters and pitches were manufactured and tested. The experimental results showed that the condenser height, and the wire and tube pitches had the strongest impact on the heat transfer rate. Finally, a semi-empirical correlation was put forward, where 90% of the experimental data were predicted within a ±10% error band.

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Details

  • Original title: A new correlation to predict the heat transfer rate of natural-draft wire-on-tube condensers.
  • Record ID : 30026394
  • 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.2019.0184

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