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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...
Ask the Experts

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...
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Google PowerMeter

Google PowerMeter is a free energy monitoring tool that helps users to save energy and money. Using energy information provided by utility smart meters and energy monitoring devices, Google PowerMeter enables users to view their home'...
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RETScreen

The RETScreen Clean Energy Project Analysis Software is a unique decision support tool developed with the contribution of numerous experts from government, industry, and academia. The software, provided free-of-charge, can be used...
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Arkusz do ilościowej oceny środowiskowej budynku

Wynikiem końcowym oceny jest świadectwo oceny charakterystyki środowiskowej budynku. Dokument ten jest generowany automatycznie na podstawie obliczeń opartych o wcześniej wprowadzone dane. Świadectwo składa się z czterech podstawowych...
W celu określenia wpływu budynku na środowisko stworzono uproszczoną metodę jego oceny środowiskowej. Metoda ta nazwana jest metodą ilościową, gdyż głównym jej celem jest porównanie ilościowych wskaźników charakteryzujących oceniany...
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Product specifications in accordance with VDI 3805 accessible online

Bonn. All product specifications in building services, written according to the standard VDI 3805, will be progressively retrievable also online from the website www.shk-branchenportal.de. This is a result of cooperation between the German...
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Inspection of air conditioning systems: conclusions and recommendations of the CA EPBD

To support EU countries in the implementation of the EPBD, a Concerted Action (CA) was launched by the EC to promote dialogue and exchange of best practice. National authorities from 29 countries are involved in this forum. The CA EPBD (...
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Inspection of boilers: conclusions and recommendations of the CA EPBD

To support EU countries in the implementation of the EPBD, a Concerted Action (CA) was launched by the EC to promote dialogue and exchange of best practice. National authorities from 29 countries are involved in this forum. The CA EPBD...
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Recommendations on a 2nd generation of CEN standards to support the EPBD now at CENSE website

dear all, At the IEE-CENSE website you will now find a summary of the main recommendations on a 2nd generation of CEN standards to support the EPBD. http://www.iee-cense.eu/Feedback/Interim%20findings.aspx The IEE CENSE project (2007-...
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Archidur blog

Blog généraliste permettant, aux architectes notamment, de s'informer sur leur métier et sur l'impact du développement durable sur leur profession. http://archidur.wordpress.com/
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Links to more specialised information

For more detailed information on specific articles of the EPBD check out also the following dedicated communities: Energy Performance Calculation Procedures (art.3 EPBD) Minimum Energy Performance Requirements (art. 4, 5, 6 EPBD)...
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computer applications for the energy certification of buildings

Hi: I am doing a project on computer applications for the energy certification of  buildings in European countries, is there a list compiling all? Thanks
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SketchNBDM

NBDM plug-in for Google SketchUp is an optional module for the free version of Google’s SketchUp design tool, allowing to create NBDM files from a 3D Google SketchUp drawing. This plug-in is based on the existing plug-in for EnergyPlus....