周期性边界条件下多层墙体内热湿耦合迁移

Coupled Heat and Moisture Transfer in Multi wall Under Periodic Boundary Conditions

摘要:

为了研究墙体在室外热湿气候下内部温度和水蒸汽密度变化，建立以温度梯度和水蒸汽密度为推动势的多层墙体内一维热湿耦合传递方程.在室外温度、水蒸汽密度周期性变化作用下，利用Fluent软件修改标量方程求解该耦合方程，将对数值结果同文献实验结果对比，两者较好吻合.以室外典型年参数计算冬、夏季墙体内水蒸汽分压力及热流密度分布.计算结果表明，在冬季内保温和墙体接触面发生冷凝并结露,外保温在冬、夏季均不会出现结露.

Abstract:

With the temperature and water vapor gradient being chosen as the driven potential,the coupled heat and moisture equations were established in multi wall.Under the periodic conditions,the coupled equations were solved by a numerical method,and the Fluent was used to modify the scalar equation.The numerical results were also compared with the experimentally measured data reported in the literature.Water vapor pressure and heat flux distribution were computed.The results show that in winter,condensation occurs in the interface between the interior insulation and brick;but for the exterior insulation,condensation never occurs either in winter or summer.