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ENERGY EFFICIENCY of UPS systems. Each module within the UPS system has a rectifier, inverter, static bypass, and a processor, thereby ensuring continuous power supply even if one module of the entire system fails. The table 3 shows the number, installed capacity, and efficiency of the systems both before and after retrofit, across Infosys campuses in India. In table 4 there is an example of UPS configuration comparison between conventional and modular UPS systems. The average efficiency of the UPS system has improved by 18 per cent, thereby reducing energy use and energy costs to a great extent. UPS retrofit has helped Infosys achieve about 10 MW connected load reduction in the last four years. UPS retrofit has a short payback period of less than three years, making it financially viable for others to emulate. White roofs: Additionally, Infosys roofs have been painted with High-albedo white paints (SRI value greater than 75 percent) to reduce heat gain and minimize air conditioning loads. According to Infosys, this minimizes solar heat gain by reducing the roof’s surface temperature by up to 10degC. Infosys has also taken up lighting system retrofit to optimize its lighting energy consumption. Conventional lighting fixtures have been replaced with efficient LED light fixtures and with essential controls such as occupancy and daylight sensors. This has led to a reduction of over 60% in the total lighting energy consumption. Innovative technologies: In addition to undertaking new energy efficient buildings and deep retrofit projects in existing buildings, Infosys has made its buildings live labs to test and adopt new innovative technologies. Radiant slab based cooling: Infosys SDB 1 building in Hyderabad is the first radiant cooled commercial building in India and the biggest comparison of cooling systems in the world. The building is a live lab split into two symmetric halves, one half with conventional air conditioning and the other with radiant cooling. Data over the last five years show that radiant cooling technology is 30% more efficient than conventional cooling. Radiant panel based cooling: Infosys is the first in India to implement the radiant panel-based cooling system. Pipes are embedded in panels of modular sizes like ceiling tiles, and are then interconnected to allow water flow. Cooling is achieved when the occupants, computers, lighting and equipment radiate directly to the cold ceiling. Fresh air is supplied through an air system that maintains pleasant indoor air quality. The company believes that this system is the solution for cases with specific ceiling designs and retrofits in existing buildings to achieve considerable energy reduction. But, at the same time the available radiant cooling solution may not be cost effective in India and be a major constraint for adoption. Radiflux radiant cooling solution: To overcome the limitations of these radiant cooling systems, Infosys has developed Radiflux radiant cooling solution in- house. Radiflux is a high efficiency, high quality, reliable, affordable and quick to install cooling solution. It delivers about two times more capacity for the same coverage area, than other radiant panel solutions available in the market today. Radiflux is designed, developed and made in India solution for the world, with patents pending in US, Europe and India. Continuous monitoring: Infosys strongly believe that data talks. Thus, the company is also monitoring and measuring efficiency improvements in real-time, through their central command centre in Bangalore. The central command center is managing the smart buildings, energy management systems, solar PV systems, data center power usage effectiveness, battery management systems, energy consumption for sewage treatment plants, and weather stations for their performance across Infosys campuses from one single place. Operations data flowing into the command center from various systems across campuses is used to review and optimize operations, drive resource conservation, perform fault detection and diagnostics, and ensure high level of comfort and indoor air quality to our building occupants. The data helps in evaluating and validating our current design, and also improving design for future buildings and systems. Infosys is constantly pushing boundaries and setting new benchmarks for the industry to achieve highest level of efficiency. Infosys has made an unassailable business case for large companies to implement energy efficiency initiatives. The company has demonstrated that these initiatives have an attractive payback period for other corporates and wider communities to emulate. All the data- backed energy efficiency initiatives are easily replicable in large- scale across the globe in a cost effective manner. Infosys wants to lead a systemic change and build a low carbon future for the benefit of the society and environment Figure 2: Roof painted white to minimize heat ingress into the building. 50 energetica INDIA · JAN | FEB16


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