冷柜门封吸合面水蒸气渗透速率的计算方法

发布时间：2018-04-10 11:20

  本文选题：冷柜 + 门封　； 参考：《制冷学报》2017年04期

【摘要】：冷柜内的温度在设定值附近周期性变化时,空气压力也呈周期性变化,柜内空气与柜外空气通过门封吸合面发生质量传递;水蒸气可通过门封吸合面渗入,造成冷柜内结霜及热负荷增加。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,远大于水分子的平均自由程,判断出水蒸气通过门封吸合面是黏性流动;然后根据黏性流动Darcy定律开发水蒸气渗透速率公式,并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%,公式可用于通过门封水蒸气渗透速率的计算。
[Abstract]:Cause frosting and heat load increase in freezer.In order to control the water vapor permeability, a method for calculating the water vapor permeation rate of the gate sealing surface is developed in this paper.First, the surface morphology of the gate sealing surface is observed, and the scale of the permeable channel is determined to be micron, which is far larger than the average free path of water molecules, and the water vapor is found to be a viscous flow through the gate sealing surface.Then the formula of water vapor permeability rate is developed according to the Darcy law of viscous flow, and the permeability coefficient is fitted based on some experimental data.The results show that the error between the predicted value and the experimental value of the formula is less than 15. The formula can be used to calculate the permeation rate of water vapor through the gate seal.
【作者单位】： 上海交通大学制冷与低温工程研究所;
【基金】：国家自然科学基金(51506117) 中国博士后基金(2015M581610)资助项目 上海市优秀学术带头人计划(16XD1401500)项目资助~~
【分类号】：TB657
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本文编号：1730980