Decentralised production means greater stability problems for the electricity system. This paper investigates a wide range of storage solutions. Rather than just looking at storage capacity or economics, it considers the very different technical characteristics of storage options in terms of available power, efficiency, durability and reliability.Read full article
Safety and security are ever more at the forefront of people’s minds as shown by many studies into the additional support techniques needed for the elderly who wish to be independent and continue living at home for longer. This is not so much about protection against burglary, but rather protecting the person himself, reflecting the fact that, when the elderly live at home alone, a major concern is that they will not be able to contact anyone were they to get ill, fall or for whatever reason suddenly to need help.Read full article
Here you see a duplicate duplication … but this you already know. What is new is that now the 2 lamps on the left give a bright white light, and the two on the right are dim and yellowish, opposed to the previous photo! While nothing much was changed – the photo was only taken a moment later.Read full article
Energy efficiency (EE) measures have shorter payback periods than generally assumed
Many energy efficiency (EE) measures in industry consist of improving purchasing and maintenance practices and procedures. These measures often have positive implications other than just energy savings. They can also reduce maintenance costs and increase the productivity of the site. These ancillary savings are often forgotten when calculating the payback rate of EE measures. In reality, EE measures often have significantly shorter payback periods than previously assumed. This is the principal conclusion of a recent study by the U.S. DOE’s Office of Energy Efficiency and Renewable Energy (EERE).
EE potential twice as large as generally assumed
The conclusion of the U.S. DOE confirms an earlier finding made in the paper 'Productivity Benefits of Industrial Energy Efficiency Measures', published in Energy 11 in 2003. This paper demonstrated a strong correlation between EE measures and productivity. Systematically taking into account the productivity benefits when calculating the payback period would actually double the potential of cost-efficient EE improvements, according to this paper.
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In countries like Germany, Denmark, or the Netherlands, wind power is already so widespread that few onshore sites are left on which new units can be built. Two main paths are being followed to further increase the electrical power generated by wind: building offshore wind parks, and replacing existing wind turbines with new and larger types (3 to 5 MW). The older, replaced types are appearing on the second hand market and will allow other (developing) countries to start using wind power at lower costs.Read full article
A lot of work is being done on setting new energy consumption standards for new build housing – such as the 2016 ‘zero carbon’ target for the UK – but relatively little is being done about the existing stock. Because new build adds much less than 1% to the housing stock each year, the majority of the stock will have been built to much lower construction standards. About 40% of the UK housing stock was built before 1945.Read full article
Based on a Discussion Webinar, Friday, April 11th 2008
Losses in transmission and distribution networks represent the single biggest use in any electricity system. In Europe, they consume between 4 and 10% of electricity generated. What can be done to optimise the electricity system and reduce these losses? Which countries are setting a good example? And what is the role of regulation and policies on this point? Current tariff systems in most European countries are not really favouring network efficiency, and what about the influence of increasingly distributed generation on future network losses?
These and other questions were addressed in a Discussion Webinar on April 11th 2008. The following are a few of the major points arising from that discussion.
7% of the energy is lost in the network
The world average loss in the electric network system is 8.8%. However, this figure includes countries like India and Brazil, where the losses are high due to so-called “non-technical losses” – electricity which could not be invoiced and is mainly lost via illegal network connections.
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Brian Fortenbery from EPRI presents the Industrial Design Guide (IDG). The IDG provides a strong technical basis for working with industrial end users in power quality, distribution, and economic development activities. The tool describes in detail such industrial processes as injection-molded plastics and CNC machining, includes electrical diagrams of the processes and sub-processes, and discusses the economics of process-associated downtime. The descriptions and drawings are interactive, leading the user to important power quality considerations, such as sensitive components, test protocols, solutions, and applications. This authoritative guide to industrial processes can be used to train new power quality engineers, refresh seasoned representatives, and enhance the credibility of all employees in the presence of end users, and the web-based format makes it easy for even novices to use.
This interview is in 2 parts.
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With an ageing European population and there being fewer young people in the population, we will have to ensure that, where they wish to do so, the elderly can continue to live at home independently for longer.Read full article
Here you see a duplicate duplication in so far as the advantageous tandem operation mode of 2 fluorescent lamps is combined with a lead-lag compensation of 2 such pairs, which is also quite an advantageous thing to do if done adequately. But when you want to take a photo to demonstrate the difference between the leading and the lagging pair, then you end up with a surprise: Does the phase angle take influence on the colour rendering of the lamps?Read full article