This research aims at proposing an evaluation method for thermal characteristics of a passive house containing phase change materials. Temperature fluctuation and heat flux are assumed to be sinusoidal waves. Heat storage amount is predicted by the latent heat, the thermal conductivity of wall components, temperatures of the inner and outer sides of the wall, and so on. By examination using calculation, it is confirmed that the proposed method enables the prediction of the room temperature fluctuation in a day from outside air temperature and solar radiation data.
