ISO DIS 16343

Description / Abstract: This standard 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 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 16346 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

This standard, 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.

It additionally includes numerical indicators at system or component level.

It defines the different types of rating, such as calculated, measured, design and tailored rating and the energy uses to take into account (such as heating, cooling, domestic hot water, ventilation, cooling and lighting).

This standard defines:

a) Overall indicators to express the energy performance of whole buildings, including heating, ventilation, air conditioning, domestic hot water and lighting systems. This includes different possible indicators

b) Ways to express energy requirements for the design of new buildings or renovation of existing buildings.

c) Procedures to define reference values

d) Ways to design a procedure for building energy certification.

Furthermore, it provides a (calculation) link between delivered energy and the energy performance indicators for buildings. Since a building generally uses more than one fuel (e.g. gas and electricity), the different energy sources are collected per energyware. The overall rating is based on a weighted sum of delivered energywares. The weightings can be related to, for instance, primary energy or CO₂ emissions, to provide the end result of the calculation of energy performance.

It also provides calculation procedures to assess the energy performance on the basis of measured energy use, including ways to convert the measured values to values under standardized conditions (environment, user).

Finally, it defines the system boundaries needed to make a distinction between building energy needs, technical building systems, energy supply systems on site and distant energy supply systems.

This standard can be applied to a group of buildings, if they are on the same lot, if they are serviced by the same technical systems and if no more than one of them has a conditioned area of more than 1000 m².

This standard provides different options at different levels. When this standard is used to set up national regional methods for expressing energy performance and/or for energy certification of buildings, the choices between the options shall not be made by the individual user, but by authorized national or regional bodies.