CENSE

Can the calculation method for the overall transmission and ventilation heat loss coefficients be used for existing buildings?

Yes, but some of the required input data may not be available at reasonable costs. For those cases default values may be provided at national level, e.g. as function of type and age of construction.

Question submitted by: Dick van Dijk (TNO, The Netherlands)
Anwered by: Dick van Dijk, TNO (The Netherlands) and Brian Anderson, BRE (UK)

Date: 2009/02/19

Can the calculation method for the overall transmission and ventilation heat loss coefficients be used for existing buildings?

why was the term “heat transfer” introduced instead of “heat loss” in the CEN standards to support the EPBD?

Heat is lost from a building or building part by transmission or ventilation, as a result of a positive temperature difference between the indoor and outdoor (or other) environment. However, if the indoor temperature of the considered building or building part is lower than the temperature of the other environment (outdoor environment or another building part), the heat loss becomes negative. Therefore the more neutral term “heat transfer” was introduced from the 2007 versions of the EPBD related standards on.

why was the term “heat transfer” introduced instead of “heat loss” in the CEN standards to support the EPBD?

EN ISO 13790 and EN 15603 offer different (holistic or simplified) should be used, and when?

National documents define under which conditions the two methods are to be applied. The choice of method depends on several aspects. First the purpose of the assessment should be considered, as it influences the level of detail required. The type and complexity of the building and its technical system are also relevant parameters. In general, the holistic approach is applied for complex systems and when a high level of detail is required.
More information: CENSE Information Paper P095 which can also be downloaded from the BUILD UP Portal.

EN ISO 13790 and EN 15603 offer different (holistic or simplified) should be used, and when?
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What is the current status of the EPBD CEN standards and where can I obtain these?

All CEN standards (EN or EN-ISO) and draft standards (prEN or prEN-DIS) can be ordered from the National Standards Body organisation (NSB) (see www.cen.eu).
All EPBD CEN standards were published in 2007 or 2008, as EN or EN-ISO standards.
The total set contains 2000 pages. As usual, EN’s are published in English and, by choice of DIN and AFNOR, also published in a German or French version. It is up to the other NSB’s to decide if national language versions will be produced, depending on the target group as explained under the question: "Are CEN standards only available in English?".

What is the current status of the EPBD CEN standards and where can I obtain these?

How is the CEN work organised?

CEN is the European Association of national standardisation institutes, the so called National Standards Bodies (NSB’s). These NSB’s are responsible for the contact with the interested market parties and experts preparing the CEN standards in the same way they do when preparing national standards. Members of CEN-Technical Committees (CEN-TC’s) are nominated by the NSB’s. The TC’s decide on the scope and content of a standard. The actual work is done in smaller CEN-TC-Working Groups whose expert members are nominated by NSB’s.

How is the CEN work organised?

Why not one CEN standard covering all EPBD aspects?

There are several reasons why there is not just one CEN standard covering all EPBD aspects. The two main reasons are:

1. The CEN standards cover different types, with different application areas and different target groups, ranging from building designers and inspectors to specific specialists on building physics or systems (lighting, ventilation, cooling, heating, hot water, ..).

Why not one CEN standard covering all EPBD aspects?

Why should we use a simplified method for the calculation of the energy need and use of buildings?

In particular in the context of building regulations it is essential that a prescribed method is verifiable and legally secure and that there is consensus on the procedures. Therefore, transparency, robustness and reproducibility are important quality aspects which may hinder the choice of a detailed simulation tool. An overview of advantages and disadvantages of different types of methods, depending on the application, is given in the Buildings Platform Information Paper P026 which can be downloaded from the BUILD UP Portal.

Why should we use a simplified method for the calculation of the energy need and use of buildings?

Why are the symbols in some of the EN ISO not always the same as in the CEN standards to support the EPBD?

For instance: in EN ISO 13789 the subscripts for transmission and ventilation are T and V in ISO and tr and ve in CEN.
There may be two reasons:
1) because the EN ISO standard was already published before the common symbols were agreed upon in CEN (which was in 2007);
2) because the ISO standard is closely linked to other ISO standards which use different symbols.

Question submitted by: Dick van Dijk (TNO, The Netherlands)
Anwered by: Dick van Dijk, TNO and Jaap Hogeling, ISSO (The Netherlands)
Date: 29/04/2009

Why are the symbols in some of the EN ISO not always the same as in the CEN standards to support the EPBD?

Are the common definitions given in CEN/TR 15615 mandatory?

CEN/TR 15615 is not a standard, but a technical report and therefore the definitions (annex C) are not mandatory. However, most of the definitions are adopted also in the European standard EN 15603, which is one of the key standards in the set of standards to support the EPBD. It is intended that the annexes C and D of CEN/TR 15615 will form the basis of a future trilingual standard covering common definitions and symbols for energy calculations. Most Member States are planning to adopt the CEN standards in one way or another within a few years.

Are the common definitions given in CEN/TR 15615 mandatory?