Study of Thermal Performance of ITS Rectorate Building as Energy Efficiency Efforts towards Sustainable Living

Global warming and low energy building are important issues today. Producing low energy building's is part of effort to reduce global warming. Study of the building thermal performance can be seen as a good first step, to reduce energy consumption. The ITS Rectorate building is used as a case study for low-rise institutional office buildings in the humid tropics.Simulation method was used to investigate external heat gain such as the building design configuration, openings, fabric materials, and internal heat gain which influence to thermal performance of ITS Rectorate building. Simulation experiment was supported by Ecotect v 5.5 software. Input data was obtained through field studies.The results indicates that thermal performance of third floor is the poorest because. the cooling load is higher compare to other two floor. Internal gain, ventilation gain and also fabric materials (including heat gains through roof) have contributed to cooling load on the third floor.