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La réponse du bois lamellé pour augmenter la quantité de bois dans la construction dédiée à l’immobilier d’entreprise

Suite au nouveau décret, relatif à l’utilisation du bois en construction, qui multiplie par 10 les quantités de bois à utiliser dans les bâtiments neufs, le SNBL estime qu'il s'agit d'une exigence à laquelle il est aisé de répondre...
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Grenelle 2 adopté : les changements dans le bâtiment et le secteur de l'énergie

  L'Assemblée nationale vient d'adopter le projet de loi portant engagement national pour l'environnement, dit Grenelle 2. Défini par Jean-Louis Borloo, ministre d'Etat, ministre de l'Ecologie, de l'Energie, du Développement durable...
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CO2-online heating atlas

Data origin: Due to internet consultancy for energy efficiency over many years, co2online owns about one million of different building data, being representative for the whole centrally heated building stock in Germany. The data covers...
The heating atlas is a graphical presentation of the German energy consumption based on 10 % of the heated building floor area in relation to all German buildings. Here you find energy consumption data of 50,000 buildings throughout...
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The European Display® Campaign

The European Display Campaign is a voluntary scheme designed by energy experts from European towns and cities. When started in 2003 it was initially aimed at encouraging local authorities to publicly display the energy and environmental...
The European Display Campaign is a voluntary scheme designed by energy experts from European towns and cities. When started in 2003 it was initially aimed at encouraging local authorities to publicly display the energy and environmental...
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Will airtightness measurements be mandatory in 2020?

The recast of the EPBD imposes that all EU member states impose near-zero energy targets for new buildings. In practice, it will require that the building airtightness level has to be assessed. one can imagine several ways to assess the...
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Are Energy Performance Certificates covered by the IEE call 2010?

I am trying to find out if Energy Performance Certification is covered by the current Intelligent Energy Europe Call 2010 funding opportunities. In fact I don't see certification under the programme's component "energy efficient buildings...
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Easy Cogen tool

The Combined Heat and Power (CHP) Tool developed by Cogen-Challenge is available at no charge to help you answer questions on CHP. The Easy Cogen tool is a software tool that evaluates the feasibility of using gas or oil engines to...
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Lowex

The quality of energy and matter is expressed by the concept of "exergy." It represents the resource-capacity of energy and matter, or their "ability to disperse themselves into their environment." Exergy can...
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Minergie Modul

Energy consumption is an important part of the quality of a building. MINERGIE® is a quality label destinated for new and renovated  buildings.  The label is recognised by the industry, the local (cantons) and federal authorities and...
Label focused on product quality in terms of energy efficiency of buildings
Ask the Experts

Is it true to say that round ventilation ducts with a single gasket generally achieve airtightness Class C?

Although this seems to be true, this is a dangerous generalization. There are many factors that govern airtighness of round ductwork, including roundness (any slight ovality can cause leakage at the joints) and the flatness of the seams at...
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Is it possible to use the HVAC fan itself to measure the airtightness of the ductwork in a ventilation system?

This is generally not possible. In systems with good airtightness, the leakage flow rates are too small for one to be able to accurately measure the flow rate over the fan.For more information you can check-out the Webevent presentation “...
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Are circular ventilation ducts more airtight than rectangular ones?

In general, yes. For more information you can check-out the Information Paper P187 “Duct System Air Leakage — How Scandinavia tackled the problem” by P.G.Schild & J.Railio, on the BUILDUP website
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Is there an overview of the way the national EPB regulations take duct airtightness into account?

A good starting point is the paper "stimulating better envelope and ductwork airtightness with EPBD" by Carrié et al., at the AIVC 2008 conference (www.aivc.org).Another possibility is to check out the presentation “Including leakage in...
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Is the default ductwork leakage class 2.5*A in the French energy proformance calculations mentioned in any CEN standard?

It is not presently mentioned in CEN standards. Other countries might be using the same default level as France in their energy performance calculation standards, but there is no reason to harmonize it. The leakage class 2.5*A is very much...
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Do we have an example of a country where airtightness is good without any regulations requirement?

Sweden does not use its building regulations to impose its strict requirements on ductwork airtightness. Rather it is a voluntary trade standard (the AMA VVS specifications) that has driven the market transformation to more airtight...
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Why is the ductwork leakage test only performed at 1 single pressure (400 Pa) in Scandinavia?

The reason for this is twofold:(1) When one uses only one test pressure, then the test results can be expressed with just one number, the “flow coefficient”. This is very simple and avoids the need for any calculations. You are suggesting...
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Why is the ductwork leakage test only performed at 1 single pressure (400 Pa) in Scandinavia?

The reason for this is twofold:(1) When one uses only one test pressure, then the test results can be expressed with just one number, the “flow coefficient”. This is very simple and avoids the need for any calculations. You are suggesting...
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What kind of screw should we use to fit metal ductwork with good airtightness?

It is important to use the correct type of screw or rivet. Avoid screws with a wide drill tip (which drill a hole in the duct wall) and blind pop rivets (which are not airtight because the inner splint falls out). The best screws are ones...
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In Scandinavia , duct system leakage tests typically involve only 10% of the ductwork system. Which 10% should be tested?

In Sweden, according to the trade guidelines VVS AMA, on-site pressure tests need only cover 10% of the duct surface area round ducts, and 20% for rectangular ducts. Denmark has similar rules. In Finland, 20% of the duct surface area is...
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Will better commissioning of ducts be a solution for the air leakage problem?

In part. Leakage testing of duct systems, by means of a pressure test, is a very effective way of achieving more airtight duct systems. This type of commissioning is required throughout Scandinavia, to check compliance with minimum...