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Energy Net

Peak Energy: Passive Solar Design Techniques - 0 views

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    Will Stewart has a guest post up at The Oil Drum on passive solar design techniques - Passive Solar Design Overview - Part 1. Also, at TOD, a post on the Passivhaus standard from another long-time commenter, marjorian - US Housing and the Passive Home Standard. Passive solar refers to the design and placement of a building to enable solar heating without the need for sensors, actuators, and pumps, in contrast to active solar, which utilizes pumps/blowers, sensors, and logic control units to manage collection, storage, and distribution of heat. The two techniques are not exclusive, however, and can work together effectively. As solar radiation (insolation) is a diffuse energy source, and not at the beck and call of a thermostat, passive solar design techniques are at their best when combined with other related methods, such as energy efficiency (insulation, weatherization, building envelope minimization), daylighting, passive cooling, microclimate landscaping, and a conservation lifestyle (i.e., temperature settings, raising and lowering of insulated shades, etc). Most of these topics will be covered in other articles, though passive cooling will be addressed in this series, which is intended as an overview, as a complete engineering treatment on passive solar design would require several dozens of articles.
xviet77896

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25 Sur ce marché urbain, encore à construire, des offreurs de services - entrepreneurs individuels ou déjà compagnies spécialisées - entrent en contact avec les municipalités. Linitiative est génér...

started by xviet77896 on 08 Nov 14 no follow-up yet
owen11158

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..suite dans l'enseignement à l'école élémentaire en cycle 3. 2 Le but de cet article est d'expliciter les conditions et les contraintes d'intégration des TICE dans les pratiques d'enseignement et ...

started by owen11158 on 06 Dec 14 no follow-up yet
xemma789

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Pour les industriels comme pour le gouvernement et les élites, elles constituent un élément clé d'une stratégie économique fondée sur la qualité des produits et sur la validation institutionnelle d...

survetement ed hardy

started by xemma789 on 17 Dec 14 no follow-up yet
eco20-20

Plant Breeding | Green Entrepreneurship Opportunities: GreenCareersGuide - 0 views

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    Some general knowledge of plants, how they grow and breeding techniques is obviously necessary. Other skills that could be useful would be some basic genetics and hybrid techniques.
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Le 9 novembre 1956, dans L'Express, Jean-Paul Sartre annonçait sa démission du Parti : «On ne peut plus avoir d'amitié pour la fraction dirigeante de la bureaucratie soviétique.» De François Furet ...

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started by opinions1 opinions1 on 19 Aug 14 no follow-up yet
xred456

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Autour de 1900, un nouvel habitus urbain voyait le jour, imposé par les premiers usagers de lautomobile. Ceux-ci se recrutaient pour le principal dans laristocratie et la bourgeoisie de louest pari...

started by xred456 on 08 Nov 14 no follow-up yet
MrGhaz .

Home Tweet Home: Some Ingenious Building Techniques - 0 views

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    For every creature a home is an important factor. It provides protection from predators and affords shelter from the elements. Birds, in particular, devote considerable time to creating a suitable abode. The vast majority build their own nests, although there are some exceptions. For example, some owls use a hollow in a tree , and most falcons and nightjars dispense with a nest altogether and lay their eggs on bare earth.
xketh147

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Les procédés nouveaux, comme la fabrication des couleurs artificielles, s'y implantent, et la recherche appliquée, quoique relativement empirique, place les industries fran?aises à un niveau accept...

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started by xketh147 on 17 Dec 14 no follow-up yet
xred456

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Or, Le Verger appara?t comme un témoignage essentiel du r?le des mères dans l'éducation et la formation professionnelle des filles.33 L'identité des deux auteurs est difficile à établir: Madame du ...

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started by xred456 on 17 Dec 14 no follow-up yet
fiona3322116

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Battu, Formation FCR, Initiation aux t233;l233;communications,...suite. Cette technique induit certes un délai de transmission plus long, et qui augmente avec la taille du message, mais en contre-p...

started by fiona3322116 on 17 Nov 14 no follow-up yet
xfiona3322116

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39 La logique politique et industrielle, par le biais des négociations menées par la France auprès de ses partenaires européens, permet donc un temps aux datagrammes de simposer au niveau européen....

started by xfiona3322116 on 17 Nov 14 no follow-up yet
xangle44556

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En permettant dutiliser le protocole X25 du CCITT et en retenant une norme technique internationale, la Communauté Européenne situe sa volonté de placer les usagers sur un pied dégalité au plan tec...

started by xangle44556 on 17 Nov 14 no follow-up yet
xdora2211133

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Au fur et à mesure que la demande accrue de services deau et déclairage, de transport, voire de petite force motrice à domicile, nétait plus considérée comme relevant du seul échange commercial de ...

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opinions1 opinions1

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Même si le pays en question arrive à conclure les négociations d'adhésion et à appliquer avec vigueur tout l'acquis communautaire, la perspective d'adhésion devient aléatoire. Il dépendra dorénavan...

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Energy Net

A Better Battery? The Lithium Ion Cell Gets Supercharged: Scientific American - 0 views

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    A new technique could pave the way for improving the workhorse lithium ion battery used in automobiles, cell phones and other devices so that it can recharge in seconds RAPID RECHARGE: Scientists tweaked a battery material to permit a super-quick flow of charge-carrying ions in and out. A new twist on the familiar lithium ion battery has yielded a type of power-storing material that charges and discharges at lightning speed. The finding could offer a boost for plug-in hybrid and electric vehicles and possibly allow cell phone batteries to regain a full charge in seconds rather than hours. Scientists at the Massachusetts Institute of Technology (M.I.T.) report in Nature today that they devised a way for lithium ions in a battery to zip in and out about 100 times faster than previously demonstrated. "We took a basically great material called lithium iron phosphate [LiFePO4] and we tried to improve it further," says study author Byoungwoo Kang, a graduate student in M.I.T.'s Department of Materials Science and Engineering.
Energy Net

FAQ: A concentrated power boost for solar energy - CNET News.com - 0 views

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    Concentrating solar power, which has been around for decades, is one of the most promising techniques being tried today to make solar electricity more cost effective.
Energy Net

Technology Review: Efficient, Cheap Solar Cells - 0 views

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    A cheap new way to attach mirrors to silicon yields very efficient solar cells that don't cost much to manufacture. The technique could lead to solar panels that produce electricity for the average price of electricity in the United States.
Energy Net

Start-Up Sells Solar Panels at Lower-Than-Usual Cost - New York Times - 0 views

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    Nanosolar, a heavily financed Silicon Valley start-up whose backers include Google's co-founders, plans to announce Tuesday that it has begun selling its innovative solar panels, which are made using a technique that is being held out as the future of solar power manufacturing. The company, which has raised $150 million and built a 200,000-square-foot factory here, is developing a new manufacturing process that "prints" photovoltaic material on aluminum backing, a process the company says will reduce the manufacturing cost of the basic photovoltaic module by more than 80 percent.
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