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Criterion to predict frost formation on liners of refrigerated compartments.

Number: pap. ID: 247

Author(s) : PIUCCO R. O., MELO C., HERMES C. J. L.

Summary

This paper investigates a theoretical criterion to predict whether frost will form on the inner liners of refrigerated compartments. The model considers the most important factors that drive the frost nucleation process, i.e., the supercooling degree and the surface conditions. To this end, a ‘Combi’ top-mount refrigerator was tested within a climatized chamber with rigid control of the temperature and humidity. Two experimental tests were carried out, one keeping the doors closed and another using an automatic door-opening device. During the tests, both the liner surface temperature and supercooling degree were monitored at different locations within the refrigerated cabinet. After the test period, the cabinet was opened and photographed to identify the sites of frost deposition. In addition, samples of different liner materials were extracted from the refrigerated cabinet in order to measure the contact angle and roughness. For each surface, the maximum supercooling degree observed experimentally was plotted as a function of the contact angle and thus compared to the nucleation limits provided by a theoretical model. Although the criterion was devised based on data obtained by testing a household refrigerator, it can be easily extended to any kind of refrigerated compartment where the required conditions for frost nucleation are observed.

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Pages: 8 p.

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Details

  • Original title: Criterion to predict frost formation on liners of refrigerated compartments.
  • Record ID : 30002324
  • 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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