The number of commercial buildings in Japan is estimated over 10 million and these buildings are considered to emit large amounts of CO2. However, environmental load for commercial buildings has not been fully researched and those researches done in the past have focused on limited subjects or areas in Japan. This research aims to develop a nationwide database on CO2 emission and water usage of commercial buildings which can be used by researchers, policy makers and business people. This paper reports the outline of this database and the specific primary energy consumption, which was developed centrally by 33 universities. The data was collected through questionnaire surveys which was conducted between 2007 and 2009, and a total of 40,085 building data was collected, of which 27,902 were disclosed. The collected data was divided into 23 uses and primary energy consumption intensity for the disclosed database were calculated by areas, gloss floor area and year of completion. The number of commercial buildings in Japan is estimated over 10 million and these buildings are considered to emit large amounts of CO2. However, environmental load for commercial buildings has not been fully researched and those researches done in the past have focused on limited subjects or areas in Japan. This research aims to develop a nationwide database on CO2 emission and water usage of commercial buildings which can be used by researchers, policy makers and business people. KeywordsThis paper reports the outline of this database and the specific primary energy consumption, which was developed centrally by 33 universities. The data was collected through questionnaire surveys which was conducted between 2007 and 2009, and a total of 40,085 building data was collected, of which 27,902 were disclosed. The collected data was divided into 23 uses and primary energy consumption intensity for the disclosed database were calculated by areas, gloss floor area and year of completion.

Southeast Asian countries are now experiencing remarkable economic growth in recent years. In hot and humid countries like Cambodia, airconditioning equipments are becoming widely accepted. Because of the lack of fundamental data on Cambodian lifestyle and energy consumption, this paper first studies and estimates the amount of energy consumption of Cambodian houses in urban areas by questionnaire method, targeting the families living in Phnom Penh and Siem Reap. Then the amount of energy consumption of Cambodian houses is estimated by simulation analyses on typical two types of model houses. And the paper simulates many methods to decrease the amount of energy consumption, and proposes the most effective and realistic methods to mitigate the rapid increase of energy consumption in southeast Asian countries.