Energy audit on lighting system for 7-storey educational building – Energy saving opportunity

An energy audit is an important process for determining a building’s energy efficiency. This process includes verification, monitoring and analysis of energy usage and recommending ways to improve energy consumption. This paper presented a study on energy balance, utility system description, methodology to calculate the energy consumption, load apportioning and room data survey on luminance for a 7-storey educational building. The resulting data is then analysed to assess energy performance, identify opportunities for improvement without compromising safety, usability and comfort levels, and suggest potential energy savings measures that can be implemented later. As a result, it shows that the building consumed a total of 669,840.84 kWh of energy over the year of 2016 and 53.64% of the energy usage comes from lighting system. The proposed energy saving measure on lighting system for this building were expected to give 167,873.28 kWh reduction of energy per year by retrofitting an 18 watt and 36 watt of fluorescent lamp to 10 watt and 18 watt of light emitting diode lamp. The room data survey on luminance measurement also shows that 69% of the interior space is overlit, and delamping can result in a total energy savings of 45,550.08kWh per year. Lastly, the total energy saving can also contribute to 116.50 ton/year of CO₂ reduction.