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Usefulness and subtlety of the overall coefficient of heat transfer in cooling containers.

Author(s) : LABRANQUE G., KACIMI A.

Summary

Insulating packaging and containers refrigerated by the latent heat of fusion of a phase change material (PCM) are used to guarantee the cold chain during transportation. These static cooling containers can be characterized by the overall coefficient of heat transfer. The calculated heat transfer coefficient is used to size cooling containers. The heat transfer coefficient is calculated in terms of the thermal conductivity of PU panels and the outer packaging (cardboard). The insulating thickness and the cold load are defined on the basis of heat balance. The heat Q exchanged across the surface S, during a duration t, for a difference of temperature between the inner of the container and the surroundings must equal the quantity absorbed by the cold source. The authors determine the experimental (evaluated) heat transfer coefficient K(exp), using the test results and Q. K(exp) is about 3% lower than the calculated value of the heat transfer coefficient and 6% lower than the coefficient K(mes) measured by Cemafroid. The experimental value characterizes the container performances because it integrates the components of heat exchanges by conduction, convection and radiations, as well as the quality of manufacturing and the airtightness of the container. It allows the qualification of the container. For varying temperature profiles comprising extreme warm and cold segments, it is necessary to study heat exchanges inside the container, in addition to K values.

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Pages: 2010-1

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Details

  • Original title: Usefulness and subtlety of the overall coefficient of heat transfer in cooling containers.
  • Record ID : 2010-0601
  • Languages: English
  • Source: 1st IIR International Conference on Sustainability and the Cold Chain
  • Publication date: 2010/03/29

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