关键词: 蓄冷配送箱, 蓄冷特性, 液氮充注量, 传热面积, 蓄冷板装载量, 二次回归正交旋转组合

Abstract: The liquid nitrogen filling method has the advantages of high efficiency and low cost, and the liquid nitrogen temperature is low, which can charge and cool the tuna cold storage distribution box. In order to understand the influence of the different cold source introduction parameters on the cold storage characteristics of the tuna cold storage distribution box, a test platform for the tuna cold storage distribution box was set up to study the effects of factors such as liquid nitrogen quality, heat transfer area and cold plate loading on the cold storage characteristics of the cold storage distribution box using quadratic orthogonal rotation combination design. The test results showed that the liquid nitrogen quality, heat transfer area and cold plate loading had significant effects on the cold storage characteristics of the cold storage distribution box. The cooling rate of the air in the box increased with the increase of liquid nitrogen quality and heat transfer area of the cold storage plate, but the cold plate loading had little effect on the cooling rate. With the parameters of 14 kg liquid nitrogen quality and 0.12 m2 heat transfer area, a better cooling rate could be achieved. The cold storage efficiency of the cold storage plate in the box increased with the increase of heat transfer area and cold plate loading and decreased with the increase of liquid nitrogen quality. With the parameters of 6 kg liquid nitrogen quality, 0.12 m2 heat transfer area and 70% cold plate loading, a better cold storage efficiency could be achieved. The research results will provide a reference for the optimization of the cold source introduction of the cold storage distribution box.

Key words: cold storage distribution box, cold storage characteristics, liquid nitrogen quality, heat transfer area, cold plate loading, quadratic orthogonal rotation combination