Identification of Existing Office Buildings Potential to Become Green Buildings in Energy Efficiency Aspect

The rise of the issue of climate change and the energy crisis makes the building must perform energy saving measures in order to reduce the adverse effects on the environment. Green Building Council Indonesia (GBCI) has set the criteria named Greenship for Green Building, including on aspects of Energy Efficiency and Conservation that with regard to energy consumption savings. High-rise office buildings located in major cities, like in Jakarta, are encouraged to meet that criterion. Three hypothetical office building models are created and simulated to obtain the Energy Efficiency Index (EEI) and then classified into intensive, standard, and efficient cases. Alternative savings are then applied in simulation to meet the Greenship which is divided into two categories, namely saving alternatives without cost such as changing room temperature setpoint, air conditioning operating schedule, and chilled-water setpoint and alternative savings with cost such as replacement of lamp, glass, and chiller, window film installation. These efforts can produce big savings of EEI up to 40% with the attainment of maximum Greenship score of 36.