Integrated panel coated with the super-hydrophilic photocatalyst can spread water film on the surface and evaporate water efficiently. This paper demonstrates the efficiency of the cooling effect obtained by the observations with the actual scale model. The following remarks may be given. (1) The heat balance formula on the outer wall surface to calculate surface temperature and released heat is shown. (2) The predicted value agrees well with the measurement. (3) The parameters in the formula were obtained through the experiments under the various weather conditions.
