Abstract
In this paper, a one-air-point model (macro model) was applied to long term simulations to investigate the thermal performances of PCM wallboard asuuming a winter season in a cold climate area in Japan. The convective heat transfer coefficient in the macro model was given using results of short term calculations with a CFD code (micro model). Macro model was able to predict the thermal environments in quantitatively acceptable accuracy compared with micro model and was also able to reduce CPU time drastically. Results with long term simulations showed that PCM wallboard is effective in the energy saving, in the cost saving, and particularly in the peak power reduction.
