A large thermal capacity is effective in keeping heat load more flat, and making the heating and cooling equipment small. In this study, it shows about the effects on applying the PCM (Phase Change Material)-wallboard, which is the plasterboard with PCM pellets, and the melting point of the PCM is approximately the room temperature. This melting point of the PCM is helpful to keep the space temperature and heat load more flat all the year around. By using the PCM-wallboard to a wooden house, it makes the space temperature and heat load more flat, as that of concrete house, by the latent heat thermal storage. This paper shows about the measurement for the thermal behavior of the PCM-wallboard as a basic ability, the field experiments using experimental model houses, and the study on the simulation program, to examine the possibility of keeping the space temperature and heat load more flat and also the possibility of the peak-cut control.
