Effect of Cascade Air Supplyon Temperature Distribution in Refrigerated Truck
Reasonable temperature distribution within a carriage guarantees the quality of transported cargo and improves energy efficiency. Thus, it is important to develop a refrigerated truck with a uniform temperature distribution to improve its transport capacity. Therefore, a cascade air supply mode was...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2020-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2020.05.116 |
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| Summary: | Reasonable temperature distribution within a carriage guarantees the quality of transported cargo and improves energy efficiency. Thus, it is important to develop a refrigerated truck with a uniform temperature distribution to improve its transport capacity. Therefore, a cascade air supply mode was presented to improve the uniformity of the temperature field of the single-temperature refrigerated truck. When there is no cascade air supply system, the cold air forms a circulation in the refrigerated truck. The flow of the cold air is in a specific direction, which is not conducive to the overall cooling of the carriage. In a cascade air supply system, fans are added at the top of the carriage. The velocity of the cold air is increased, and the flow direction is more diverse, which is beneficial for improving the speed of overall cooling and uniformity of the temperature field. A simulation model of a single-temperature refrigerated truck was established to optimize the temperature distribution within the refrigerated carriage. The influence of cascade air supply system on the temperature field of the refrigerated truck was investigated via computational fluid dynamics (CFD). Subsequently, a contrast experiment was conducted to verify the results of the simulation. The average temperature of the jet region, global average temperature, non-uniformity coefficient of temperature field, and the difference between the highest temperature and lowest temperature were used as the evaluation criteria. The results indicated that the cascade air supply system can effectively reduce the average temperature of the jet region, global average temperature, non-uniformity coefficient of temperature field in the refrigerated truck, the difference between the highest temperature and lowest temperature. Furthermore, it can increase the cooling velocity. The decrease in average temperature and increase in cooling velocity were evidently optimized because of the cascade air supply system, especially within the area of the jet region. The decrease in temperature in the corner of the rear carriage was not obvious. However, the cooling velocity was evidently increased. |
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| ISSN: | 0253-4339 |