By Stefan Fassbinder / Published on Tue, 2009-03-31 12:29
Here you see what can be observed at the input terminals of the PC power supply, in the first row with the full load of both the PC being operated and the battery being charged simultaneously, in the second row with the PC alone when the battery is full.
When you shut the PC down the residual power intake is only more 0.8W. With the active power being as low as this it becomes obvious from the view of the curve as well as from the measured values that the reactive current from a filter capacitor now prevails the total current.
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By Stefan Fassbinder / Published on Fri, 2009-03-20 12:23
The gross energy consumption to get back the 150 Wh consumed before (see last week) is 200 Wh. Note that this latter figure includes all losses incurred by both the charger and the charge-discharge cycle of the batteries! So we are faced with a pretty good overall efficiency of the process being as high as 75%, and we can say that the gross power consumption of this portable PC when used off the line, including all charge-discharge and conversion losses, is between 11 W and barely 40 W. The battery operating time is between 5 and 18 hours.
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By Hans De Keulenaer / Published on Thu, 2009-03-19 08:27
The EU Directive for the promotion of the use of renewable energy sets a target of renewables origin for 20% of consumed energy, both electrical and thermal use. Individual targets are set on country basis. The directive is extremely ambitious and calls for a significant acceleration of growth in an alreadyfast growing market, while the EU is not on course for meeting its 2010 renewable targets. On the other hand, despite the financial crisis, political support for the renewable targets appears unwavering.
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By Sergio Ferreira / Published on Wed, 2009-03-18 11:48
This Paper Courtesy: The Green Grid - Get connected to Efficient IT
Previously, The Green Grid published a white paper entitled “The Green Grid Metrics: Describing Data Center Power Efficiency”. The white paper discussed the need for a finite number of industry-accepted metrics that describe the effectiveness and efficiency of data centers around the world. The white paper also provided an overview of a proposed metric called the “Data Center infrastructure Efficiency” (DCiE).
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By Bruno De Wachter / Published on Tue, 2009-03-17 17:32
Reegle provides information about clean energy policies worldwide
If you are searching for up-to-date information about renewable energy or energy efficiency policies in a particular country, try the Reegle Web site.
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By Stefan Fassbinder / Published on Fri, 2009-03-13 08:19
This long-distance-travellers’ model comes with an optional attachable supplementary battery and two chargers. Let us attach the extra battery and see how far we get. It has a rated energy capacity of 95 Wh and, when fixed, operates together with the internal standard battery that adds another 55 Wh to it.
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By Hans De Keulenaer / Published on Thu, 2009-03-12 16:04
Sarah Darby, Lower Carbon Futures, Environmental Change Institute, Oxford University Centre for the Environment
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By Hans De Keulenaer / Published on Thu, 2009-03-12 16:01
Rebecca White , Environmental Change Institute, Oxford University Centre for the Environment, United Kingdom
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By Hans De Keulenaer / Published on Thu, 2009-03-12 09:03
Following the launch of Leonardo Visions last month, we've created a short animation (15 screens) to introduce this new concept.
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By Bruno De Wachter / Published on Thu, 2009-03-12 06:30
Trend change or coincidence?
In 2008, wind energy was the preferred technology for new generation capacity in the EU. According to the Planet 2025 NewsNetwork, 43% of all the new power capacity commissioned in the EU last year was wind power. This compares to 35% for natural gas, 13% for oil, 4% for coal, and 2% hydroelectric power.
After years of natural gas dominance, this sounds like a real trend change. Has the era of renewable energy begun? That may be, but nevertheless, a few observations are in order.
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By Isabelle Heriakian / Published on Wed, 2009-03-11 17:13
“Power Quality in Future Electrical Networks”
conference is focused on ‘future’ industry PQ issues that are fast becoming reality, such as :
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By Fernando Nuno / Published on Tue, 2009-03-10 13:16
This annual conference has become one of the main platforms for debate and the exchange of information and knowledge across the solar energy sector and related fields. It aims to bring members of the sector into contact with political representatives, the financial world and the media. The conference will provide a framework allowing contact between people interested and involved in renewable energy issues.
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By Hans De Keulenaer / Published on Fri, 2009-03-06 20:45
Paul Hines, Jay Apt, and Sarosh Talukdar , Carnegie Mellon Electricity Industry Center
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By Hans De Keulenaer / Published on Thu, 2009-03-05 09:12
Renewable energy portfolio standards will require higher penetration of renewable energy sources in the years ahead. Such large-scale integration of renewable generation sources into the electric power grid is raising critical issues.
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By Hans De Keulenaer / Published on Wed, 2009-03-04 01:00
Lukas Kranzl, Energy Economics Group, Vienna University of Technology,Austria
Anselm Brakhage, Fraunhofer Institute for Systems and Innovation Research, Germany
Pedro Gürtler, Association for the Conservation of Energy, UK
Jacky Pett, Tyndall Centre for Climate Change Research, UEA, UK
Mario Ragwitz, Fraunhofer Institute for Systems and Innovation Research, Germany
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