该论文基于质量守恒机制，对Lee模型的冷凝控制方程中的时间松弛系数开展动态修正。

Lee model is commonly accepted for modelling the mass transfer processes subject to both evaporation or condensation. However, the mass loss or mass excess always exist due to the mismatch of condensation and evaporation coefficients. Rare study focused on the proper ratio of them in closed systems. In present study, a dynamic correction model (named mass-conservation model) against to the condensation time relaxation coefficient is proposed, which can adjust the condensation coefficient in each time step considering the mass conservation between the initial state and the current state. Three typical closed structures are introduced for model validation in which severe mass loss and temperature prediction deviation are recognized. Result shows that the mass variation calculated by present dynamic correction model is less than 0.5% while the maximum mass loss with other models could reach 48.31%. Meanwhile, the prediction error of the three Cases calculated with the present model is the smallest, with the maximum decrement of 29.73% compared with other models. It is also realized that the insufficient heat release and the mass non-conservation are the key factor resulting in the temperature prediction deviation, which is well solved by present correction model on condensation time relaxation coefficient.