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(summary presented in chapter 4) are met (case one for a newly constructed building and case two for a renovated building).

5. Residential buildings and apartments in these buildings are subject to independent assessment according to the annex 3 to the Ordinance on methodology. Thus, the building assessment is not automatically the assessment of

each separate apartment. The assessment of the

apartments will be done according to the same methodological rules as for the building, but using the specific data for the apartment. An apartment may have a different EP than the building, and different apartments in the same building may have different EPs.

6. The reference performance is calculated for each building assuming that the building is fulfilling the requirements defined in the secondary regulations, mainly in the recently reviewed Ordinance of the Minister of Infrastructure from the 12th of April 2002 on the technical criteria to be met by buildings and their location, which constitutes a significant backup to the methodology-related Ordinance. Some of the energy features are determined directly through a calculation methodology of energy performance.

7. The most important calculations relating to the determination of the energy performance of a building correspond to the energy use for heating, ventilation and cooling. They are generally based on standard PN-ISO-EN 13790, using a new database of climate parameters (suitable for both monthly and hourly methods) that has been put into a text file and is freely available on the Ministry of Infrastructure’s website

(www.mi.gov.pl/2-48203f1e24e2f-1787735-p_1.htm)

8. Thermal protection calculations use two new regulations in Poland, the coefficients HT (heat loss through the envelope) and HV (heat loss through ventilation). The methodology for the calculation of HT is described in standard PN-EN ISO 13789.

4 > Requirements for new and modernised buildings

Polish regulations make provision for two alternative ways of fulfilling energy requirements. The first method is prescriptive and consists of a list of detailed requirements for different building components. The second method has a performance character and defines permissible values of specific non- renewable primary energy use EP, expressed in kWh/(m2year). The second method offers more freedom for designers. For instance, lower quality thermal insulation can be compensated with better systems or utilization of a more environmentally friendly source of energy.

Both methods allow for lower quality energy performance of modernized buildings, in comparison to new buildings identical in form and use. In the first method, the mean heat transfer coefficient for the whole building envelope can be 15 % higher than in the new building. In the second method, modernized buildings can also have a 15% higher primary energy use (EP).

Prescriptive method

The energy requirements for all the new buildings and for modernised buildings with a useful area over 1000 m2 encompass:

› maximum permissible U-value, 0,3 W/m2K for external walls, 1,7-1,9 W/m2K for windows;

› maximum solar radiation coefficient for windows and glazed or transparent partitions, gc < 0,5 (total energy transmittance corrected by shading factor), but in case of windows or transparent partitions that exceed 50% of the external wall area, the requirement becomes fG⋅gc < 0,25, where fG is the share of transparent parts in external wall;

EPBD Buildings Platform > P140_EN_Poland_December2008

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