STUDY ON THE EFFECTS TO THE ENVIRONMENT DUE TO RETROFIT OR RECONSTRUCTION ON AN EXISTING OFFICE BUILDING

Energy consumption and carbon dioxide emission due to retrofit or reconstruction of an existing office building were analyzed by using basic sector classification Input/output table and the construction data of the actual projects. With the retrofit case, energy consumption per unit floor area is 3.8 GJ/m^2 and carbon dioxide emission per unit floor area is 306 kg - CO_2/m^2. With the reconstruction case, if the quality of the finish work is equivalent to the retrofit case, enerery consumption is 11.2 GJ/m^2 and carbon dioxide emission is 966 kg - C0_2/m^2 due to the effect of demolition and reconstruction of the structure.