Performance Based Façade Design Study of Department of Public Affair Building Complex in Jakarta Indonesia Agus Hariyadi 1,2 , Jatmika Adi Suryabrata 3 , Atika Nur Fitriana 4 , Hiroatsu Fukuda 5 1 Lecture, Universitas Gadjah Mada 2 PhD Student, The University of Kitakyushu 3 Associate Professor, Universitas Gadjah Mada, 4 Researcher, CUDD-Universitas Gadjah Mada 5 Professor, The University of Kitakyushu Abstract Architectural façade design is one of the most importance factor in designing a building. It will be the first impression that people will remember about the image of the building. It also component which consume large portion of the construction and maintenance budget. Designing façade of building must be consider based on the environment surrounding its location. Climate is the main factor which has to be focusing when simulating the performance of the façade which will affected to the energy performance of the building. In the case of building complex, each of the building also have influence to the penetration of solar radiation which will have effect on the effectiveness of façade performance and also the energy performance of the building. Simulating the façade of the building including every other building in the complex will give better overview and understanding about the effect of other building and the effectiveness of the building façade itself. Comparison between each simulation result and the cost of the building façade will be used to determine the final façade design. Base on the simulation result, façade building can be more efficient when considering the surrounding building which still maintain the thermal performance of the building. Keyword: building performance, façade, energy 1. Introduction Globally, Buildings, as human build environment, are responsible for a large share of global energy use and CO2 Emission. They account for 30-40% of global energy use and 33% of Global CO2 Emission [1]. Energy consumption in a building is dominated by HVAC system, which is influenced by external gain mostly in high rise building. The components that affect the solar heat gain are glazing material, opening area, orientation. Façade design become the important design element not only in maintain the energy consumption but in the architectural aspect. Façade also consume a large portion of the construction and maintenance budget. In façade design, many practitioners have conducted façade analysis in order to decide the final façade design. However, most of them only analyze the building without considering the surrounding buildings. In case of buildings complex, it could give a different and sometimes significant result. Especially for building in the highly massive complex. One example is in Jakarta, in the government building complex, buildings are located near each other. This paper attempt to analyze the result differences of the energy consumption and cost from building which have been simulating with surrounding building and without surrounding building. 1.1. Study case – SDA Building, Ministry of Public Works, Jakarta Ministry of Public Works Building complex is located in Jakarta Indonesia, it consists of 6 buildings which have different shape and height. Each building will be influenced by other building. Fig.1 Ministry of Public Works Building Complex, Jakarta, Indonesia. Journal of Asian Urban Environment, Annual 2015 7