Most ICT gear - core facilities, communications infrastructures, and edge devices - runs on DC power. Converting AC to DC within a building is inefficient, on-site renewable power generation is usually DC to begin with, and super-efficient LED lighting is also DC. So DC power distribution has been a attractive option, but there have been vigorous arguments for and against. Recent events suggest the tide is turning in favor of DC distribution, although skeptics continue to press their case. The growing use of solar-generated electricity might be providing the latest boost DC.
Image courtesy IEEE Spectrum
Wearable tech is of interest to Green ICT because it can drive miniaturization and energy efficient. Miniaturization can reduce resource consumption in the creation of ICT gear and reduce e-waste in its disposal. Miniaturization combined with energy-efficiency can enable a host of applications ranging from "smart building" sensors to compact assistive technology. Is more wearable tech all positive? We look at a number of technologies, including one developed in Kenya which allows shoes to charge mobile phones.
What is a battery? A device to store energy and convert it to electricity on demand? This is an important question as ICT facilities and infrastructure elements increasingly rely on sophisticated battery-based systems such as UPS. Potentially greener alternatives are emerging to chemical batteries, with flywheels appearing to have the most momentum for ITC facilities going into 2013.
Let's start by reviewing the role energy storage devices play in ICT. A 2011 APC white paper lists three applications:
Microsoft has announced plans to spend $5.5 million to build a zero-carbon data center pilot project in Wyoming. A source of very low carbon electricity is key to such projects. Microsoft's power generation fuel? Municipal sewage!
We've covered the issue of 'vampire devices": excessive standby power consumption in consumer electronics and other ICT components. As integrated circuits become more power-efficient during operation, their standby power consumption becomes an issue, too. A research group at Japan's Center for Spintronics Integrated Systems and Research Institute of Electrical Communication of Tohoku University together with NEC Corporation (NEC) has developed a standby-power-free large-scale integrated circuit (LSI).
Two technology advances point to the promise of more more energy-efficient memory. One is described as "nanoscale", the other "atomic scale". The latter comes with a video.
Interest in energy-efficient computing has sparked a Vertatique discussion of energy-sensitive benchmarks beginning in 2007. We originally saw pages per kilowatt hour, "MIPS / Watt" or "Flops / Watt" and Peter Kooge's "performance / joule". More have since been proposed, including one from focused on CO2e, but none have emerged as definitive.
Facebook mentions in passing that its highly efficient Prineville data center uses "Ethernet-powered LED lighting [to] reduce the total energy required to run the facility." Additional information about what exactly Facebook has done is hard to fine. What is Ethernet-powered LED lighting?
ICT products manufacturer Quanta (Taiwan) supplies servers to Facebook and Google, cloud computing giants that spec their own server designs. It is also an investor in multi-core U.S. chip innovator Tilera. These relationships points to the possibility for a new generation of energy-efficient volume servers for cloud computing.
The University of Illinois has had a strong focus on e-waste through its Sustainable Electronics Initiative (SEI). Now, researchers at the University are experimenting with a technique that would enable electronic circuits to repair themselves. This holds the promise of longer service lives and therefore less e-waste. Here are excerpts from "Autonomic Restoration of Electrical Conductivity" in Advanced Materials.