Building Optimization through Overall Thermal Transfer Value Analysis in Abdi Siswa Catholic School Patra Unit, West Jakarta

Abstract

Overall Thermal Transfer Value (OTTV) is affected by Window-to-Wall Ratio (WWR), which impacts the daylight which enters the building. Thus, OTTV is linearly related to WWR but inversely proportional to the lighting intensity, making SNI Standard-compliant OTTV and lighting design quite challenging. To boost student productivity, schools need proper lighting, which has not been achieved by the case study building: Abdi Siswa Catholic School Unit Patra. With the OTTV standard from SNI 6389-2020, which has a maximum value of 35 W/m², and the room illuminance level from SNI 6197-2020, quantitative evaluations and recommendations were done at the Abdi Siswa Catholic School Unit Patra. Thus, the objective of this research is to give recommendations in optimizing lighting condition which complies with the OTTV standard through WWR and glass type assessment. This study connect the dots of students productivity at school by achieving room lighting standards while still having an ideal OTTV value. The emphasizes on illumination chan ges are given through recommendations simulated using DIALux Evo. This research concludes that buildings’ existing OTTV values meet standards. However, student study rooms' lighting is still below standard. However, the relatively small WWR which contributes to the low OTTV, adversely affects the lighting conditions in the classrooms, library, and laboratories. Efforts to utilize and maximize natural lighting proved to be an impractical option because the rooms are shaded by the building itself. Therefore, adding artificial lighting is the most practical solution in terms of cost, labor, and time.