冷冻空间软硬吸合面间湿空气呼吸效应机制

项目名称： 冷冻空间软硬吸合面间湿空气呼吸效应机制

项目编号： No.51506117

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 能源与动力工程

项目作者： 赵丹

作者单位： 上海交通大学

项目金额： 20万元

中文摘要： 冷冻空间温度在设定的温度上下限内波动时，门封吸合面将周期性地吸入外界高湿度热空气和呼出内部低湿度冷空气，这种“呼吸效应”导致能耗上升及被保存物品的品质损害；其不利影响的减弱有赖于对空气渗透量的精确控制，这就需要掌握冷冻空间软硬吸合面呼吸效应的机理并实现定量描述。本项目针对影响湿空气呼吸效应的渗透路径、渗透推动势、渗透机制等关键因素开展研究；首先通过应力分析、粗糙表面形貌的数字化表征，建立反映应力作用下吸合面缝隙三维微观形貌的渗透路径模型；然后建立软硬吸合面结构对于周期性水汽冷凝影响下的冷冻空间内湿度场与温度场、压力场耦合模型，实现软硬吸合面耦合渗透推动势量化描述；最后在对单一渗透推动势下软硬吸合面缝隙空气迁移微观分析的基础上，建立湿度、温度、压力三个渗透推动势同向和反向耦合作用下空气渗透量模型。项目成果为冷冻空间软硬吸合门封的优化设计提供必需的基础模型，并丰富缝隙间湿空气渗透理论。

中文关键词： 冷冻空间；吸合面；湿空气；呼吸效应；渗透

英文摘要： When the refrigerating room temperature fluctuates around the set values, magnetic seals will periodically inhale high-humidity hot air and exhale low-humidity cold air. The breathing effect results in the increase of energy consumption and the decrease of preservation quality. To reduce these adverse effects, the amount of air infiltration must be precisely controlled. Therefore, the breathing effect mechanism of the magnetic seals should be investigated and the quantitative description of the breathing effect should be achieved. As the infiltration path, infiltration potential and infiltration mechanism are key factors of the breathing effect, they will be investigated, sequentially. Firstly, a penetration path model which is capable of characterizing the 3-D morphology of micro-rough crack under mechanical stress will be established, based on the combination of stress analysis and 3-D numerical characterization; secondly, a coupled model for the fields of temperature, pressure, humidity in refrigerating room under the periodical influence of moisture air condensation will be developed for the quantitative description of the coupled infiltration potential; finally, a micro analysis of the moisture air migration in the crack of magnetic seal under single infiltration potential will be done, and the prediction models for moist air infiltration under the influence of synthetic and the antithetic pressure potential, temperature potential and humidity potential will be established. The research results will provide theoretical basis for optimizing magnetic seals of refrigerating room, and enrich the theory of moisture air infiltration in cracks.

英文关键词： refrigerating room;magnetic seals;moist air;breathing effect; infiltration