Retrofits of multi-storey office building facade

Abstract The city of Jakarta is the 7th big city in the world that has the most high-rise buildings. High-rise buildings in Jakarta were built from 1971 until now and in the 90s it was the peak of the construction of high-rise buildings such as offices and apartment. Tall Buildings with glass facade, concentrating plans are the most typology of office high-rise buildings in Jakarta. Buildings with the dominance of glass facade that reflect heat cause an increase in temperature in the microclimate and a decrease in building performance resulting in the amount of energy used by buildings, especially air conditioners. Building facade play an important role in reducing the improvement of the microclimate and energy use in buildings. Therefore, an analysis was carried out on the BRI II building on Jalan Sudirman Jakarta as a case study that represents the typology of the most office buildings in Jakarta. It turns out that this building has a high OTTV (Overall Thermal Transfer Value) value, so the largest AC cooling load comes from the building casing. Therefore, facade retrofit is one of the alternatives that can be done to reduce energy use, especially air conditioning. After that, a simulation of the casing retrofit to obtain a significant retrofit action can reduce the AC energy used through ottv value reduction analysis.