Abstract:
The objective of this study is to increase the energy efficiency in the standard type of government office building.This study was conducted through a computer program Building Energy Code (BEC) version 1.0.6 . Guidelines to the Net Zero Energy Building can be archived by: (1) using 50 mm. fiberglass insulation with a density of 32 kilogram / cubic meter (kg/m3) in a solid wall, (2) using 6 mm. green reflective glass with 0.41 heat transmission value (SHGC), (3) adding a 25 mm thickness glass fiber insulation with density of 32 kg/m3 to the rooftop, (4) changing the lighting system to LED, (5) improvement of the air conditioning system, and (6) using solar energy panels with 17.1% efficiency as a renewable energy. In this case study, the selected building has the total energy consumption of 209,091.33 kWh/year before the improvement, and reduced to 94,963.32 kWh/year after the improvement by improving solid and translucent wall, roofing, air-condition system and lighting system. The total energy consumption is reduced by 114,128.01 kWh/year (54.37%). The solar panels can produce a total energy of 147,713.84 kWh/year. Including improvement guidelines and use renewable energy from solar panels Making the overall energy consumption in the building to net zero energy. The payback period is 14.39 years and 4.87% rate of return. with escalation rate of electricity that increases payback period to 21.06 years, rate of return 10.59%