Field observation of cooling energy saving by the high reflectance paint

Cooling energy savings in a building with the roof coated by high reflectance paint are examined. It is difficult to recognize the cooling energy savings by using the data observed every hour. It is assumed that factors affecting to cooling energy load are the internal heat generation, the set temperature, weather conditions, etc. From the analysis on the relationship between in-outdoor air temperature difference and electric power consumption for air conditioner, which are averaged and integrated into every day, the reduction of electric power consumption by high reflectance paint coating is estimated about 72Wh/m2/day.