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Heat and mass transfer in the defrost process: a new modelling paradigm.

Number: pap. ID: 158

Author(s) : MOHS W. F., KULACKI F. A.

Summary

An important problem in the refrigeration industry is the formation and removal of frost layers on surfaces of sub-freezing air coolers. Frost directly diminishes the performance and efficiency of the entire refrigeration system by presenting resistance to the air flow and heat transfer in the air cooler. To return the system to pre-frosted performance, the frost layer is removed through a defrost cycle. Current methods used for defrosting, namely applying heat directly to the frosted surface, are inherently inefficient. A majority of the applied heat is lost to the surrounding environment through convective and conductive heat transfer. While previous studies have investigated the defrost process, the majority of them have been experimental evaluations of defrost on the refrigeration system and air cooler. Only a few studies have attempted to describe analytically the fundamental heat and mass transfer processes of the frost melting process. The authors propose a new defrost model to describe the frost melting process at the surface level through all phases of the defrost cycle.

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Pages: 8 p.

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Details

  • Original title: Heat and mass transfer in the defrost process: a new modelling paradigm.
  • Record ID : 30001581
  • 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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