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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

FROST AND ICE FOG FORMATION AND HEAT TRANSFER IN SUPERSATURATED AIR IN INDUSTRIAL FREEZERS

Get access (open in a dialog) DOI: 10.1615/IHTC16.kn.000008
pages 167-201

Resumo

Frost build-up contributes to coil heat transfer performance degradation due to the insulating effect of the frost layer and the resulting coil blockage. While the frosting problem has been extensively researched, very few studies have investigated the problem in industrial freezers when the freezer is operating under supersaturated conditions. Field observations of the operation of these types of freezers indicate that this is a common mode of operation and that the transition to supersaturated operation can easily occur if proper care is not exercised. Field observations also reveal that operating freezers under supersaturated conditions can significantly accelerate the occurrence of the negative aspects of frost formation in so far as coil heat transfer performance is concerned. The purpose of this paper is to provide a summary of many years of an experimental research program whose main objective was to study coil frosting and defrosting issues at low temperatures and high humidity conditions in industrial freezers. The idea was to develop tools and protocols that help refrigeration-system designers and freezer operators improve the performance of freezer coils that are particularly prone to the frosting problem and offer the research community accurate calculation tools to predict both frost formation and heat transfer rates in supersaturated freezer air. The paper will give an overview of the research conducted and the conclusions reached.