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categories, and/or there are different technical installations serving different parts of the building or if the internal gains are significantly higher or lower in different parts of the building.

With regard to solar gains, the procedure for the energy calculation NS 3031:2007 specifies that; “in cases where parts of a building are subject to high solar heat gains, whereas other parts of the building are subject to moderate solar heat gains, the building must be divided into relevant zones for the energy demand calculations. For buildings with moderate fenestration, and efficient outside shading, it is sufficient to calculate the building as one zone”.

In the case of large window and glass areas and/or little efficient sun shading, the building must be divided into zones based upon the following > When the product of area of windows, doors and glass (γsol), divided by the conditioned floor area and the total solar energy transmittance

for window and shading, gt, supersedes 5 % (γsol/ tg > 5 %), the

building shall be divided in at least three calculation zones -One zone with façade exposed to the sun (orientation south, southeast or southwest) -One zone with little exposure to the sun (north, northeast, northwest)

-One zone in the middle of the building;

> The depth of zones with facades exposed to the sun and facades with little exposure to the sun can be set to 4 to 5 meters. Where there is a very ”slim” building design, overall depth less than 10 meters, the number of zones can be reduced to two, one exposed to the sun and one with no exposure to the sun.

> Conservatories, atriums, glass buildings or similar with all facades mainly constructed of glass should be calculated as a single zone

> Total solar energy transmittance for window and shading is defined in the detailed calculation procedures. With variable total solar energy transmittance on different facades, the values for level of exposure to the sun must be used (south, southeast, southwest)

NOTE: For buildings where the product of area of windows, doors and glass, γsol, and the total solar energy transmittance for window and sun shading gt, is less 5 % (γsol/gt < 5 %), there will normally be no need for zoning due to sun contribution.

EPBD Buildings Platform > P85_EN_Norway-June 2008

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