| 摘要: |
| 本文以组合蓄冷板为研究对象，提出一种箱内温度场均匀可控的组合蓄冷板式医药冷藏箱的设计方案，以此优化医药冷藏箱的热性能表现。首先搭建了实验平台，依据组合式蓄冷原理设计医药冷藏箱和组合蓄冷板，从等质量方案和等相变潜热方案的角度分别对比蓄冷板中相变材料（正十四烷、CaCl2?6H2O、水两两组合）内壁温度变化、蓄冷时长的表现，发现蓄冷板内层采用1.5 kg正十四烷、外层采用1.5 kg CaCl2?6H2O的等质量组合方案性能最优。在此基础上对比了性能最佳的蓄冷板在医药冷藏箱中不同摆放位置（两侧平放、两侧叠放、对角摆放、四周摆放）工况下，在2~8 ℃条件下的蓄冷时长、温度平均值、最不均匀系数和释冷速率。结果表明：对角摆放的组合蓄冷板蓄冷时长最大；四种摆放方式的温度平均值均在2~8 ℃工况内；两侧叠放时最不均匀系数最小；两侧叠放时箱内蓄冷板释冷速率最快。考虑到温度均匀优先原则，两侧叠放的等质量组合方案的蓄冷板蓄冷效果最好。 |
| 关键词: 医药冷藏箱 相变 组合蓄冷板 温度分布 摆放位置 |
| DOI： |
| Received:September 09, 2022Revised:November 04, 2022 |
| 基金项目: |
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| Design and Performance of Composite Cold Thermal Energy Storage Plate in Medical Refrigerators |
|
Chen Junwen, Wang Yu, Cheng Feng
|
| (College of Urban Construction, Nanjing Tech University) |
| Abstract: |
| To optimize the thermal performance of a medical refrigerator, a composite cold thermal energy storage plate was considered. A design scheme for a composite cold thermal energy storage plate in a medical refrigerator with a uniform and controllable temperature field was proposed. An experimental platform was developed. A medical refrigerator and the composite cold thermal energy storage plate were designed according to the principle of composite cold thermal energy storage. From the perspective of the equal mass scheme and the equal phase-change latent heat scheme, the inner-wall temperature change and cold thermal energy storage time of the phase-change materials (n-tetradecane, CaCl2?6H2O, and water) in the cold thermal energy storage plate were compared. It was found that an equal mass combination of 1.5 kg n-tetradecane in the inner layer and 1.5 kg CaCl2?6H2O in the outer layer of the cold thermal energy storage plate produced the best performance. Further, the cold thermal energy storage duration, average temperature, maximum inhomogeneous coefficient, and the cooling discharge rate of the cold thermal energy storage plate with the best performance at 2–8 ℃ were compared with different positions in the medical refrigerator (horizontally located on both sides, stacked on both sides, diagonally placed, and perimetrically placed). The results indicated that the composite cold thermal energy storage plate placed diagonally had the longest storage duration; the average temperature for the four placement positions was within 2–8 ℃. When the two sides were stacked, the maximum inhomogeneous coefficient was the lowest, and the cold discharge rate of the cold thermal energy storage plate was the highest. Considering temperature uniformity as the priority, the cold thermal energy storage effect of an equal-mass combination scheme stacked on both sides was preferred. The experimental results provide a reference for promoting the application of composite cold thermal energy storage plates for medical refrigerators in cold-chain transportation. |
| Key words: medical refrigerator phase change composite cold thermal energy storage plate temperature distribution placement |
