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Fundamental research on freezing of refrigerant by making use of membrane.

Number: pap. C3-042

Author(s) : OKAWA S., TANIGUCHI Y.

Summary

The demand of refrigerant at lower temperature by making use of solid/liquid latent heat is growing in the field of food transportation. However, because of the existence of supercooling, refrigerant cannot freeze at melting point. It must be cooled at lower temperature than the melting point. It needs high electrical load on refrigerator. Therefore, in order to reduce the high electrical load, a method of freezing supercooled solution using membrane is introduced. A capsule having solution with low concentration or tap water is installed in a package having refrigerant inside. One part of the capsule wall is made of membrane and only water can path through the membrane towards both inside and outside the capsule. Since the melting point inside the capsule is higher than the outside, solution in the capsule freeze first, and it propagates through the membrane and it becomes a trigger for the refrigerant to freeze. This study is a fundamental research on this propagation. So a sheet of membrane is put between refrigerant having high concentration and solution with low concentration, and they are cooled together. Parameters for the experiments were selected to be the difference in melting point, the location of initial ice appearance, cooling rate and membrane thickness. The results were compared and the effect and phenomena of these differences were investigated. As a result, following conclusions were obtained. Location of initial ice appearance and the membrane thickness influence the propagation, significantly. When a large difference in melting points exists, propagation effect through membrane is reduced.

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Pages: 9 p.

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Details

  • Original title: Fundamental research on freezing of refrigerant by making use of membrane.
  • Record ID : 30005155
  • Languages: English
  • Source: ACRA2010. Asian conference on refrigeration and air conditioning: Tokyo, Japan, June 7-9, 2010.
  • Publication date: 2010/06/07

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