焓法模型求解相变传热问题有效性分析

首先探讨了伴有相变过程的瞬态热传导问题所具有的非线性特征.采用将分区域求解问题化为整个区域的非线性问题处理的思路,在整个区域建立统一能量方程的焓法模型求解该类传热问题.在此基础上建立了轻质相变墙体房间空气热平衡模型.采用有限差分方法对模型进行离散,并编程求解.通过与前期所建立的轻质相变墙体实验间的测试数据进行比对,结果...

Validity Analysis for Applying Enthalpy Method to Solve the Phase Change Heat Conduction Problem

The nonlinear mathematics characteristics for phase change heat conduction problem is discussed.By transforming the partial area heat conduction problem to the non-linear problem in whole area,the enthalpy method model of energy equation in the whole calculative area is established to solve the phase change heat conduction problem.Further,the mathematics models of the phase change heat conduction and indoor air heat balance of PCM room are established,and the models are dispersed and programmed to solve the numerical calculation with the limited different method.By comparing with the prophase experiment data of inner surface and indoor air temperature in the phase change light quality fabric experiments,the result indicates that the numerical values of theoretical models are coincident well with the testing data.By the model,the calculation and analysis means for the design of phase change fabric and building energy efficiency application can be taken well.