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A methodology to measure the rates of air infiltration into refrigerated compartments.

Author(s) : VALE PEREIRA (do) P., MELO C.

Type of article: Article, IJR article

Summary

The aim of this study was to develop a methodology to measure the rates of air infiltration into refrigerated compartments based on the tracer gas dilution technique. An experimental apparatus was designed and constructed especially for this purpose. The apparatus includes a means of distributing the tracer gas uniformly into the zone, a means of ensuring a uniform concentration both in the vertical and horizontal directions, a means for obtaining the air samples, and a gas analyzer to measure the gas concentration at known times. Concentration measurements were taken using the infrared photoacoustic spectroscopy technique. Tests were carried out on three distinct refrigerators, with the compressor on and off, and with the concentration decay and constant concentration measurement techniques. It was observed that the tests have a high level of repeatability, with deviations of less than 5% in the air infiltration rate measurements. In addition, adsorption tests were carried out and the results indicated that the adsorption of the tracer gas by the refrigerator materials and gasket is insignificant when compared to the concentration variations caused by air infiltration. To verify that the technique developed is reliable and practical and that it represents a useful tool for the design and analysis of household refrigerators, two new refrigerators were tested. The tests were performed with different gaskets and extra seals in key regions. The results for the variation in the air infiltration were found to be reliable and the technique is practical to apply.

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Pages: 88-96

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Details

  • Original title: A methodology to measure the rates of air infiltration into refrigerated compartments.
  • Record ID : 30025350
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 97
  • Publication date: 2019/01
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2018.08.024

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