July 31st

Connecting Distributed Generation (DG) units to the network

By David Chapman & Bruno De Wachter

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July 30th

New report on Opportunities and Challenges for the concentrating photovoltaic power industry

Thanks to Belen Galego from CSPToday for pointing us to this new NREL report about the opportunities and challenges for development of a mature concentrating photovoltaic power industry. It's about 20 pages packed with interesting information.

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Replacement of existing wind turbines

Walter Hulshorst
Post date: 
Wed, 07/30/2008 - 17:33

In countries that started early with wind energy (Germany and Denmark), old wind turbines are often placed at locations where the wind is very good. Since the best locations for wind in these countries are occupied by old wind turbines with lower energy outputs compared with new wind turbines, programmes were started to replace the old turbines (5 up to 15 years old) with modern ones. With repowering, first-generation wind turbines can be replaced with modern multi-megawatt wind turbines.

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July 29th

9.3 Brochure on optimised fluorescent lighting

Offprint from six articles in Elektropraktiker 2003 - 2008.

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July 28th

When the price of oil goes beyond imagination our minds should follow.

The German Öko-Institute has issued a study of the German economy and the impact of high oil prices as well as oil prices that are “spiking”, i.e. oscillating between extremely high values and lower, “relaxed” values. The study aims to find out how different sectors adapt to the prices and how this adaptation affects the emission of carbon-dioxide.

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July 27th

9.2 This tutorial as a PDF

Download the text of this tutorial on lighting in English

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9 Downloads / recordings

Download some information on the efficiency of electric lighting here or view a presentation recorded in South Africa, November 2011.

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July 26th

7.3 Reliability of electronic ballasts

There is little quantitative evidence for the reliability of electronic ballasts. One statement speaks of a failure rate below 2% per 1000 hours of operation. That sounds quite nice, but for an average supermarket with 3000 h/a of operation this amounts to 6% dropouts per year. Under constant duty, like in a subway, it already means replacing more than 1 per every 6 ballasts annually.

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5.2 Special aspects when compensating small lamps

The operating voltage drop across smaller, i. e. shorter fluorescent lamps of the same type family is lower than with the longer types of the same series. Thereby a larger part of the voltage drops across the ballast, and this voltage drop is greatly – in the ideal case would be wholly – inductive.

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