Last week Paul Savage, Nextek CEO, participated in the Green Building Power Forum put on by the Darnell Group, this year out in Santa Ana, CA. It’s the third GBPF; the first was in Anaheim, the second in Tokyo. While the attendance was flat (apparently a good sign amidst the economic doldrums) it was an indicator of swift movement in the DC power realm. The EMerge Alliance was a sponsor along with the Electric Power Research Institute (EPRI) and Roal Electronics from Italy. Big news was the bump in attendance from Japanese corporations. Sharp, Panasonic, Fujitsu, NTT Facilities and JETIA were all there, following their successful conference in Tokyo a few months ago, where it was announced that the country was adopting a 380 volt DC standard for data center applications. Now – in the Japanese press anyway – several demos of DC single family homes are underway. The US had just one building materials manufacturer in attendance. We have plans to build a DC model home soon with some top-drawer US partners, hopefully some collaboration with our Japanese colleagues and some German outfits that have cut the path on modern passive strategies for ultra efficient building design.
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早在2006年，美国能源部下属的劳伦斯伯克利国家实验室（Lawrence Berkeley National Laboratory，LBNL）就进行了以直流方式向数据中心的服务器供电的试验。据该实验室介绍，运行着多台服务器的数据中心所消耗的电力，相当于面积相同的普通办公楼的100倍，如果消除目前进行的交直流转换过程，每台服务器的耗电量至少可减少9.34％。除LBNL外，包括美国思科、英特尔、美国Nextek电力系统、日本NTT FACILITIES和Sun等共29家公司也参加这一试验。此次试验设置了在380V直流电压下工作的Sun服务器群和配备英特尔微处理器的服务器群。作为比较对象，还同时运行了配置相同，利用普通交流电运行的服务群。减少交直流转换过程，除了可以削减相应的设备费用外，还可减少发热量，降低数据中心制冷设备所消耗的电力。以直流方式运行的数据中心还可以使用太阳能电池、燃料电池等绿色直流发电设备，进一步降低碳排放量。