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The objective of this research is to quantify the EEC (embodied energy/CO2) of a building. The EEC represents the energy consumption and CO2 emissions at individual phases of a building's life-cycle, such as construction (including manufacture of materials and equipment), renewal (including repair work) and demolition. Energy and CO2 emission intensities in terms of 401 sectors were calculated, using the 2005 I-O (input-output) table in Japan. According to our case study conducted from the construction phase to demolition, the EC (embodied CO2) of an office building used for 60 years is 12,044 t-CO2 and 1,093 kg-CO2/m 2 in total. CO2 equivalent emissions (CO2e) by Freon gases, contained in building materials, equipment and devices, were also calculated. As the results, CO2e by insulators was 2% of the building's EC and CO2e by refrigerants was 9%~12% of the building's EC. It is important to keep reducing emissions of Freon gases contained in refrigerators.

Intensity Calculation Using Input-Output Table and Case Study Regarding Embodied Energy/CO2 in Japan