AUT learns how to save $52,000 a year on lighting - Energyкод для вставки
AUT learns how to save $52,000 a year on lighting Client: Auckland University of Technology (AUT) EnergyMaster: Le Roux Nel, ECOsystems Challenge: Improve outdated technology and wasted lighting energy in two buildings and a car park. Solution: New fittings and controls, dimming sensors, electronic ballasts and the increased use of natural light. In brief: ECOsystems carried out audits of the lighting at two of AUTвЂ™s facilities, providing lighting and controls upgrade solutions that: вЂў Delivered total savings of $52,000 per annum and cut carbon emissions by 49 tonnes. There was a 60 per cent reduction in operational costs for the AF Building and 51.5 per cent reduction for the WL Building and car park. вЂў Improved lighting functionality, changing obsolete fittings for the latest technology and controls while maximising the use of natural light. вЂў Will enable the university to recover costs for both projects in less than 4 years. The project The AUT projects began with detailed audits of the existing lighting. AUT was experiencing increasing energy and maintenance costs associated with the lighting, which was more than 20 years old. until evening, even when classes were empty. Motion sensors were installed to turn lights on automatically when people entered a room or corridor and switch them off when they vacated. вЂњThe existing lighting was obsolete and very inefficient,вЂќ said ECOsystems General Manager Grant Winfield. вЂњWe calculated the significant energy savings that could be made and how long it would take to recover the costs of the project.вЂќ Fluorescent вЂ�wall-washerвЂ™ lights, originally designed to illuminate chalk blackboards, were removed as they were unnecessary and caused glare on the new whiteboards. Obsolete magnetic ballasts, used to drive fluorescent lamps, were causing the lighting to hum and flicker. These were replaced with electronic ballasts, which solved the problem. Problems included over-lighting, and the fact that the original power factor correction (PFC) capacitors, which reduce electrical load and minimise wasted energy, had deteriorated and were ineffective. Night time security was also an issue, with staff concerned about unlit corridors when leaving the building after working late. The solution A number of innovative approaches were used. One solution was to install new highly efficient T5 fluorescent fittings with a 96 per cent light output ratio (LOR). These cost less to run as they are more efficient at transforming energy into light. Lighting codes have changed since the building was constructed, so with the use of computer screens, less light is required now. The building also gets good natural daylight. The team found sufficient light could be provided by lighting classrooms and corridors to the current lighting standard while at the same time significantly reducing the amount of electrical lighting required. This proved particularly effective in corridors. The number of lights needed was halved. Rotating lights in the AF Building by 90 degrees also allowed more light to spread the length of the corridor, solving the security issue. Daylight dimming sensors were introduced into classrooms to measure the amount of light on the desks, the level of artificial light was then adjusted to maintain the required intensity. Overuse of lighting was also an issue, with lights switched on in the morning and usually left on Weatherproof fittings for the car park allow the lamps to run at their ideal temperature, boosting LOR to 102 per cent and improving the quality of the light. вЂњAbove and beyond the improved lighting ambience in each of the refurbished spaces, we have benefited from a dramatic reduction in our maintenance costs in these areas due to the cessation of the previously frequent replacement of dead lamps in these areas. In the car park building, where we do have an appropriate level of metering in place, it is great to see that the actual realised savings are very close to what the predicted savings wereвЂќ Russell Baillie, Director Building Services and Environment at AUT The company Energy savings specialists ECOsystemsвЂ™ vision is to reduce energy use in commercial buildings by 30 to 50 per cent. Over the past 15 years, they have successfully achieved this on a number of projects. ECOsystemвЂ™s work covers supermarkets, schools, office buildings, hospitals, service stations, museums and banks. EnergyMasters is the flagship accreditation programme of the Energy Management Association of New Zealand. EnergyMasters accredits individuals for their levels of technical competence in a range of disciplines. Go to www.emanz.org.nz/energymasters-accreditation for more details.