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Calculation procedures

Since 1985 Finland's National Building Code has included guidelines for calculating the power and energy demand for the heating and cooling of buildings. These guidelines could be used for calculations for all building types. The calculation method was refined because of the implementation of the EPBD and it follows the main principles of prEN13790. The new calculation method was published in the National Building Code in June 2007. The new calculation method has to be used for calculating the energy consumption when issuing energy certificates for small residential buildings. When applying for the building permit or issuing energy certificates for other building types (new buildings), EN standards, other more detailed calculation methods and simulation tools can also be used.

When energy certificates are issued for small residential buildings, the calculation of energy consumption can be performed by hand, on a spreadsheet, or with the use of commercial software packages that are available. The only restriction is that the calculation method has to be in line with the guidelines given in the National Building Code and with the additional rules given in the Energy Certification Decree.

Requirements for new buildings

Finland has set minimum requirements in the National Building Code for thermal insulation and ventilation of new buildings since 1976. The requirements have been changed several times in order to improve energy efficiency in buildings. The latest changes were made in 2003, when the level of the requirements was tightened by 25-30%, and in 2007, when the requirements were changed because of the implementation of the EPBD.

The new requirements are mandatory for building permits requested after 1 January 2008. The energy requirements are the same for all new buildings and include: › The requirement on maximum heat losses of the whole building (building envelope, ventilation and infiltration)

› The reference U-values and maximum U-values › The reference value for the efficiency of the heat recovery from the exhaust air (yearly efficiency 30%)

› The reference value for the air-tightness of the building (n50= 4 1/h) › The requirement on calculation of the energy demand of the building per m² of floor area (calculation has to be done, but there is no requirement for the level of energy demand )

› The control of summertime room temperature (the temperature has to be estimated when relevant)

The applicant for the building permit has to ensure that the construction will fulfil the requirements. The applicant has to make a calculation that shows the fulfilment of the energy requirements. The Ministry has published on its website an Excel spreadsheet that can be filled in to perform the calculation. The calculation sheet has to be given as a part of building permit application to the local building supervision authority. The building permit will be approved by the building supervision authority.

The energy requirements will be amended again, in order to tighten the requirements by 30–40%. In June 2008 new proposals for the building regulations have been sent for public opinion. After the process is completed, the new requirements will be published in the National Building Code and will come into force at the beginning of 2010. Furthermore, the Minister of Housing has announced that in 2012 Finland will introduce a regulation based on overall energy consumption, where the energy source will be taken into account (primary resource factor).

EPBD Buildings Platform > P120_EN_Finland_Aug 2008

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