食品冷藏保温箱温度场模拟与实验验证

Temperature Field Simulation and Experimental Verification of Food Refrigerated Incubator

目的研究食品冷藏保温箱在冷食冷藏工况下内部温度场的分布情况,验证保温箱温度的分布以及保温性能是否达到设计要求。方法采用有限元方法,使用COMSOL Multiphysics构建食品冷藏保温箱热分析模型,按照冷食冷藏的工况进行温度场模拟仿真,再通过实验验证模拟结果的准确性。结果模拟结果显示,食品冷藏保温箱内部餐盒装满0℃食品时,在外界环境温度为46℃的高温条件下贮存4 h后,食物温度由上至下递增,食物平均温度为5.55℃。实验结果显示,食物平均温度为6.65℃,均低于10℃。模拟结果与实验结果的平均误差为1.1℃。结论食品冷藏保温箱餐盒内食物温度实验数据与模拟数据变化趋势基本一致,用数值模拟方法分析保温箱温度场可行有效。蓄冷板对提高食品冷藏保温箱保温效果有较大作用,保温性能可满足设计要求。

The work aims to study the internal temperature field distribution of food refrigerated incubators under the condition of food in cold storage to verify whether the distribution and thermal insulation performance of incubator tem-perature field meet the design requirements. The finite element method was used to construct the thermal analysis model of the food refrigerated incubator with COMSOL Multiphysics. The simulation on the temperature field was carried out according to the condition of food in cold storage, and the accuracy of the simulation results was verified by the experi-ment. The simulation results showed that, when the food container inside food refrigerated incubator was filled with 0 ℃ food, and the food was stored for 4 h when the external environment temperature was at 46 ℃, the food temperature in-creased from top to bottom, and the average food temperature was 5.55 ℃. The experimental results showed that, the av-erage food temperature was 6.65 ℃, which was lower than 10 ℃. The average error between the simulation results and the experimental results was 1.1 ℃. The change trend of experimental data of food temperature in the food refrigerated incubator is basically consistent with the simulated data. It is feasible and effective to analyze the temperature field of the incubator by numerical simulation. The cold storage plate has a great effect on improving the thermal insulation effect of the food refrigerated incubator, and the thermal insulation performance meets the design requirements.