ISO DIS 16346

Description / Abstract: The standard defines the general procedures to assess the energy performance of buildings, including technical building systems, defines the different types of ratings and the building boundaries.

The three documents ISO TR 16344, ISO 16343 and ISO 16346 are closely linked:

ISO/TR 16344 provides a coherent set of terms, definitions and symbols for concepts and physical quantities related to the overall energy performance of buildings and its components, including definitions of system boundaries, to be used in all standards elaborated within ISO on energy performance of buildings.

ISO 16343 sets out ways of expressing the energy performance in an energy performance certificate of a building (including the technical building systems), and ways of expressing requirements as to the energy performance. This includes an overall numerical energy performance indicator and classes, against benchmarks.

The purpose of this standard is to:

a) collate results from other standards that calculate energy use for specific services within a building;

b) account for energy generated in the building, some of which may be exported for use elsewhere;

c) present a summary of the overall energy use of the building in tabular form;

d) provide energy ratings based on primary energy, carbon dioxide emission or other parameters defined by national energy policy;

e) establish general principles for the calculation of primary energy factors and carbon emission coefficients.

This standard defines the energy services to be taken into account for setting energy performance ratings for planned and existing buildings, and provides for this:

f) method to compute the standard calculated energy rating, a standard energy use that does not depend on occupant behaviour, actual weather and other actual (environment or indoor) conditions;

g) method to assess the measured energy rating, based on the delivered and exported energy;

h) methodology to improve confidence in the building calculation model by comparison with actual energy use;

i) method to assess the energy effectiveness of possible improvements.

This standard is applicable to a part of a building (e.g. flat), a whole building, or several buildings.

It is up to national bodies to define under which conditions, for which purposes and for which types of buildings the various ratings apply.

This standard handles the energy performance of a building as a whole. The assessment of the energy performance of specific technical building systems is handled in the appropriate part of EN 15241, EN 15243 and EN 15316 series or the appropriate ISO or national standards as listed in Annex A.