The slow switch to ISO standards in NZBC

14 April 2023 by Jason Quinn

New Zealand is slowly switching over to using ISO standards, at least for our building energy work and code in H1. The revised H1 switches to the following standards, so far:

  • ISO10211, 
  • ISO10077-1/2
  • ISO13370

I expect that someday we will replace NZS4214 with ISO6946. I also suggest we explore adopting ISO standards under the “The Energy Performance of Buildings Directive (EPBD)”. This is a reference energy calculation set of standards that countries can adopt and modify—on the basis of documenting how or why your country is different and thus requires modifications.

Here’s a very geeky source article for those who want to dive deeper.

From the amended (2018) text of EPBD Annex 1, point 1:

Member States shall describe their national calculation methodology following the national annexes of the overarching standards, namely ISO 52000-1, 52003-1, 52010-1, 52016-1, and 52018-1, developed under mandate M/480 given to the European Committee for Standardisation (CEN). This provision shall not constitute a legal codification of those standards.

The core energy calculation methods are in ISO52016-1. Together with ISO52017, it replaced ISO13790:2008, which is the core methodology in the Passive House Planning Package (PHPP).

From the ISO standard ISO52016 abstract

“SO 52016-1:2017 specifies calculation methods for the assessment of:

  1. a) the (sensible) energy need for heating and cooling, based on hourly or monthly calculations;
  2. b) the latent energy need for (de-)humidification, based on hourly or monthly calculations;
  3. c) the internal temperature, based on hourly calculations;
  4. d) the sensible heating and cooling load, based on hourly calculations;
  5. e) the moisture and latent heat load for (de-)humidification, based on hourly calculations;
  6. f) the design sensible heating or cooling load and design latent heat load using an hourly calculation interval;
  7. g) the conditions of the supply air to provide the necessary humidification and dehumidification.

The calculation methods can be used for residential or non-residential buildings, or a part of it, referred to as “the building” or the “assessed object”.

ISO 52016-1:2017 also contains specifications for the assessment of thermal zones in the building or in the part of a building. The calculations are performed per thermal zone. In the calculations, the thermal zones can be assumed to be thermally coupled or not.

The calculation methods have been developed for the calculation of the basic energy loads and needs, without interaction with specific technical building systems, and for the calculation of the system specific energy loads and needs, including the interaction with specific systems. The hourly calculation procedures can also be used as basis for calculations with more extensive system control options.

ISO 52016-1:2017 is applicable to buildings at the design stage, to new buildings after construction and to existing buildings in the use phase.”

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