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IIR document

A new defrosting method for utilization of frost.

Number: pap. O34

Author(s) : INOUE S., OHKUBO H., IKEMOTO S.

Summary

When a solid surface is cooled below the solidification temperature of water, vapor condenses on the solid surface forming frost. The frost formation is a transient phenomenon where heat and mass transfer take place simultaneously. Frost formation can often lead to a deterioration of the performance of consumer products such as refrigerators and heat pumps. Generally, defrosting is carried out by melting the frost on the heat exchangers of the devices periodically. Here, the authors propose a new mechanical method in which the heat exchangers can still maintain their low temperatures while defrosting. Therefore, not only that the overall efficiency of the heat exchangers can be improved, but also the frost crystals removed can be utilized as a regenerative material. Frost formation process consists of two stages: the crystallization of frost and growth of the frost layer, which depend on environmental and surface-related factors. In this study, the authors investigated the effect of the cooling surface characteristics on the amount of frost formed and frost layer thickness. To evaluate the frosting process, they used in this experimental investigation a new parameter, which is the force required scrap off the frost from the cooling surface. In addition, they investigated the recyclability of the frost crystals removed, as ice.

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Pages: 8 p.

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Details

  • Original title: A new defrosting method for utilization of frost.
  • Record ID : 30004997
  • Languages: English
  • Source: 10th International Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: Kobe, Japan, July 29-August 1, 2012.
  • Publication date: 2012/07/01

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