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Effect of defrost frequency of defrost efficiency, defrost heat load and coolstore performance.

Author(s) : SUJAU M., BRONLUND J. E., MERTS I., et al.

Summary

The performance of a small walk-in cool store and its refrigeration system with temperature terminated electric defrost was measured for defrost intervals ranging from 6 to 30 hours for two different heat load regimes. Defrost efficiency and defrost duration were both proportional to defrost interval and approximately doubled as defrost interval increased from 6 to 30 hours. The main benefit of longer intervals arose from reduced heating of the coil mass. The change in overall system energy use with defrost interval was not significant because the system used EPR temperature control, and the latent and hence defrost heat loads were quite small compared with the total heat load. At short defrost intervals, cool store temperature control was poorer due to the pulldowns after each defrost. At long defrost intervals, cool store RH was lower and temperature control was poorer due to significant coil performance decline and longer duration defrosts. For the system and heat load conditions studied, a defrost frequency of 8 to 12 hours appeared optimal.

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Pages: 2006-1

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Details

  • Original title: Effect of defrost frequency of defrost efficiency, defrost heat load and coolstore performance.
  • Record ID : 2010-1974
  • Languages: English
  • Source: Innovative Equipment and Systems for Comfort and Food Preservation.
  • Publication date: 2006/02/16

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