High Efficiency Modes of Operation - Emerson Network Power

October 15, 2015

One of the most widely discussed issues throughout the world today is the rapidly increasing price and demand of energy supply. Along with this comes the broadening awareness of the environmental impact and depletion of fossil fuels, which has created a natural drive towards energy saving and the widely encouraged use of new renewable energy sources, energy conservation best practices, and the development and advancement of energy efficient standards, processes and technologies. Where maximum uptime is paramount for many world leading organizations, the presence of a UPS is an indispensable prerequisite for a reliable power infrastructure able to achieve maximum load safeguarding and conservation.

UPS systems provide clean power to electronic systems such as computer networks and servers, building  management systems and security systems. A UPS also protects against power outages which could potentially lead to a halt in operations, a loss of information, productivity and profit for businesses. The energy efficiency of a UPS is considered to be the ratio between the power entering the UPS and the power exiting the UPS to supply power to the load. Whenever the current passes through the internal components of a UPS, a certain amount of energy is dissipated as heat, which results in energy losses.

Additional energy is also consumed whenever the air conditioning operates to sustain the ideal environmental temperature of the installation. Whilst a certain amount of energy losses is inevitable, it is evident that the reduction of UPS power consumption and the consequent increase of its efficiency will significantly contribute to lowering excess energy waste, maximizing the overall running cost-saving of the energy bill. The savings accomplished 24 hours a day, 365 days a year over a five-year period, would not only equal the purchase price of a UPS but also actively contribute to reducing CO2 and other global warming emissions, ensuring the lowest environmental impact of the chosen power protection solution.

Nowadays, the most common UPS topology used for supplying secure power to data centers is the double conversion mode, which ensures a Voltage and Frequency Independent (VFI) type of operation by providing the highest level of power quality to the load at all times. At the same time, as there are two stages of conversion, this is also the topology which uses the highest level of energy. Even when considering a double conversion UPS, there are massive differences in terms of double conversion efficiency as legacy UPS may operate with 93% efficiency while the highest efficiency double conversion UPS can achieve levels greater than 96%. To further increase efficiency, most UPS manufacturers introduced high energy efficiency modes of operation, such as ECO Mode; nevertheless, most of these still remain just marketing advertisements rather than a concrete way of improving the data center efficiency.

If you want to learn more about what the drawbacks of ECO Mode types of operation can be and which other techniques exist to boost operating efficiency at a maximum, keeping the load fully protected and without compromising system availability, read more in the White paper High Efficiency Modes of Operation.

You will also read about the field results achieved by the Trinergy™ UPS, which has brought new ways of efficiency improvement to the market and has proved to be the premium UPS solution for data centers aiming to have the lowest possible PUE while maintaining the highest levels of availability. Finally, you will also learn about the recent improvements achieved with the introduction of the Trinergy™ Cube, which further extends the benefits made available until now through Trinergy.

Liebert eXM UPS, 10-200 kVA/kW