| Summary: | 碩士 === 國立臺北科技大學 === 冷凍與低溫科技研究所 === 91 === The quality and the safety of food are major preoccupation of the consumers and depend mainly on cold-chain respect. The concept of cold-chain essentially means a chain of controlled temperature and humidity conditions, from the moment the produce is harvested and treated to the point where it is displayed on sale. Refrigerated container plays an important role in the cold-chain, especially the long-haul sea transportation. The main refrigeration load of all refrigerated cargo container is heat transmission during transport; this will affect the temperature of the air and food inside the container and therefore reduce the quality of the frozen product, which is precisely what we have to avoid. In order to meet the demands of the consumer for quality of the food during transport, the environment where they are stored should be appropriately and carefully controlled.
The airflow through and around the frozen food in refrigerated container has a significant effect on the environment the produce experiences. For effective design and optimization of the involved processes inside refrigerated container the use of predictive models and CFD simulation for heat and air flow visualization are essential. The objective of this study is to characterize the influence of heat transmission on the heat and airflow inside refrigerated container under various operation environments and design improvement of the equipment. The operation conditions include a sun-exposed and a sunshade environment, while the design improvement are increasing in supply flow rate and improving air distribution by holes configuration on T-bar. The results leads that the way of improving air distribution by holes configuration on T-bar, as comparison with the other improvement ways, have the best uniform temperature distribution and the lowest temperature difference of frozen food inside refrigeration container.
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