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THE DATA CENTER JOURNAL | 25 www.datacenterjournal.com Figure 8: Efficiency versus loading for an SiC-based UPS. Table 2: Efficiency chart for a 500kVA SiC-based UPS. Load Input (kW) Output (kW) 500kVA Efficiency 0% 2.46 0 0.00% 5% 29.02 26.58 91.59% 10% 52.11 49.55 95.09% 15% 78.67 75.87 96.44% 20% 104.1 101.8 97.79% 25% 124.6 122.4 98.23% 30% 154.1 151.5 98.31% 35% 180.8 178 98.45% 40% 201.7 198.7 98.51% 45% 227.5 224.4 98.64% 50% 254.2 250.8 98.66% 55% 277.7 273.9 98.63% 60% 304.3 300.3 98.69% 65% 331.3 326.8 98.64% 70% 358.3 353.3 98.60% 75% 381.8 376.3 98.56% 80% 408.6 402.3 98.46% 85% 434.7 427.6 98.37% 90% 461.8 453.9 98.29% 95% 485.4 477 98.27% 100% 512.4 503.2 98.20% Another significant advantage of an SiC-based UPS is the reduction in heat loss. At 100% load, a conventional Si-based UPS has a heat rejection of 69.2 kBTU/hr, whereas an SiC-based UPS has a heat rejection of 42.0 kBTU/hr. is difference yields a heat- loss energy savings of 39.4% (see Table 3). Table 3: Heat-loss energy savings for a 500kVA SiC-based UPS. UPS Load SiC UPS Energy Savings 100% 39.4% 75% 49.9% 50% 46.9% e intrinsic characteristics of SiC-based semiconductors also allow them to operate at higher temperatures than conven- tional Si-based semiconductors. is reduction in UPS heat loss and the ability to operate at higher temperatures help customers decrease their cooling costs, which account for approximately 35% of a data center's electrical-energy consumption. size and Weight When it comes to maximizing the available floor space in a data center, an SiC-based UPS is smaller and weighs less than the conventional Si-based UPS. A 500kVA SiC-based UPS weighs 2,770 pounds, whereas a conventional UPS weighs 3,330 pounds, reducing the floor load by 17%. Moreover, a 500kVA SiC-based UPS occupies 142, compared with the conventional UPS, which occupies 202. is 30% reduction in required floor space increases the available power capacity in a given area. As a result, the SiC-based UPS can deliver more power in a limited floor space. sUmmary In summary, SiC technology is an innovation that will establish a new trajectory for power electronics. Benefits include increased system efficiency, lower cooling-system requirements, operation at higher temperatures and higher power density. With the integration of SiC-based technology into UPSs, data center operators are achieving their goals of operating at higher efficien- cies, maximizing floor space and reducing operating costs across the facility. n references 1. Ren, F.; Zolper, J.C. Wide Energy Band Electronic Devices. World Scientific Publishing, 2003. 2. Li, Haixing; Su, Timothy; Zhang, Vivian. "Electric Field Break- down in Single Molecule Junctions." Journal of the American Chemical Society, 2015, pp. 5028-5033. 3. Wide Bandgap Semiconductors: Pursuing the Promise. US De- partment of Energy, Advanced Manufacturing Office. about the author: Anthony Pinkey, Business Development, Mitsubishi Electric, UPS Division