| 摘要: |
| 冷柜内的温度在设定值附近周期性变化时，水蒸气可通过门封吸合面渗入造成冷柜内的结霜及热负荷增加。为了控制水蒸气渗透量，本文开发了门封吸合面水蒸气渗透速率的计算方法。首先观测门封吸合面表面形貌，确定渗透通道的尺度为微米级，远大于水分子平均自由程，然后判断出水蒸气通过门封吸合面是黏性流动；根据黏性流动Darcy定律开发水蒸气渗透速率公式，同时基于部分实验数据拟合渗透系数。将公式预测渗透速率与实验值进行对比。结果表明：水蒸气渗透速率公式预测值与实验值的误差小于15%，公式可用于计算通过门封水蒸气渗透速率。 |
| 关键词: 冷柜 门封 水蒸气 渗透速率 计算方法 |
| DOI： |
| 投稿时间：2016-10-27
|
| 基金项目:国家自然科学基金（51506117）和中国博士后基金（2015M581610）资助项目。 |
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| Calculation Method for Water Vapor Permeation Rate through Cotact Surface of Refrigerator Seals |
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Xu Xudong, Zhao Dan, Xia Guanghui, Ding Guoliang, Hu Haitao
|
| (Institute of Refrigeration and Cryogenics Engineering, Shanghai Jiao Tong University) |
| Abstract: |
| Air pressure inside a refrigerator changes periodically when the temperature of the refrigerator fluctuates around the set value. Mass transfer occurs through the suction surface of refrigerator seals between air inside and outside the refrigerator. Water vapor can permeate through the contact surface, leading to frosting and an increase in thermal load in the refrigerator. To reduce the permeation of water vapor, the calculation method of water vapor permeation through refrigerator seals is developed in this paper. The permeable passage scale of the contact surface is determined to be the magnitude of um with the observation of the seal surface feature, which is much larger than that of the mean free path of the water molecules, determines that a viscous flow occurs when water vapor permeates through the surface. A formula of water vapor permeation is established based on Darcy’s law of viscous flow. The permeation coefficient is fitted with the experiment results of water vapor permeation of the contact surface. The water vapor permeation values calculated through the formula are compared with the experimental data, and the results show that the deviation of water vapor permeation predicted by the established formula is less than 15%, which indicates that the formula can be used to calculate the water vapor permeation through the contact surfaces of refrigerator seals. |
| Key words: refrigerator seal water vapor permeation rate calculation method |
