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Onboard pre-chilling of ungutted and gutted Atlantic cod in different cooling media -Temperature measurements and analytical modelling.

Author(s) : ELIASSON S., ARASON S., MARGEIRSSON B., PALSSON O. P.

Type of article: IJR article

Summary

Cooling experiments using flake ice and chilled brine/seawater were carried out on ungutted and gutted cod. Core temperatures of the fish loins and tails were measured during the cooling process. The study aims were to investigate different approaches to chilling gutted and ungutted whole fish and compare controlled brine chilling with traditional flake ice chilling. Experiments were conducted in controlled environment using fish in three weight categories, around 2.5, 4 and 9 kg. The experimental results were used as design parameters for newly developed onboard industrial chilling processes using different approaches to superchill whole gutted cod (slurry ice and refrigerated seawater/brine). Industrial chilling processes were evaluated by mapping temperature profiles onboard three wet-fish trawlers using different chilling systems and methods. Temperature measurements were then used to generate a model to estimate chilling time and the convective heat transfer coefficient between 2, 4 and 6 kg fish and cooling medium. The chilling time of equal weight fish from +8°C to 0°C proved to be 30-50% shorter with refrigerated brine chilling compared to flake ice chilling. The difference between chilling gutted and ungutted cod was apparent, as expected, due to a greater surface area between gutted fish and the cooling medium. The chilling time difference between gutted and ungutted fish was less with flake ice chilling than with refrigerated brine chilling. Comparison of the model results with onboard measurements indicate that the thermal conductivity of the fish is limiting to the energy transfer and efficiency of the onboard chilling systems rather than the heat transfer coefficient.

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Pages: 72-81

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Details

  • Original title: Onboard pre-chilling of ungutted and gutted Atlantic cod in different cooling media -Temperature measurements and analytical modelling.
  • Record ID : 30029214
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 132
  • Publication date: 2021/12
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.08.027
  • Document available for consultation in the library of the IIR headquarters only.

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