V220.127.116.11 is a method that can be used to comply with the BCA energy efficiency requirements for houses as an alternative to using the Part 3.12 elemental provisions or the NatHERS energy (star) rating modelling tools (using Accurate, First Rate 5 or BERS Pro).
V18.104.22.168 is a comparative approach that assesses the heating load and/or cooling load of the proposed building (typically measured in MJ/m2 annum) and compares it to the heating load and/or cooling load of that house’s design had it been built to the elemental provisions of Parts 3.12.1 to 3.12.4.
Similar to the NatHERS energy rating tools, V22.214.171.124 requires the use of a software/modelling tool to assess the energy efficiency of the building.
Appendix A includes an example of how this method can be followed.
Varying information has been published on the appropriateness of certain energy rating software/modelling tools that can be used for V126.96.36.199.
So what can be used?
V188.8.131.52 does not specify what modelling/software tools can be used.
This means various software tools may be used provided they are capable of assessing the heating loads and/or cooling loads within the defined temperature settings. It is essential to confirm that the software tool being used aligns with these defined temperature settings.
Defined temperature settings
V184.108.40.206 prescribes that the calculation method used must be capable of assessing the heating load and cooling load by modelling space temperatures settings in the range of 20°C to 21°C for heating and 25°C to 28°C for cooling, dependent on the relevant climate zone.
It is important to note that the temperature settings prescribed in V220.127.116.11 are different to the temperature settings used in the NatHERS energy (star) rating.
As such, in the majority of situations the NatHERS energy rating tools (BERS Pro, Accurate & First Rate 5) are not suitable to use for V18.104.22.168.
There are some software/modelling tools available, such as DesignBUILD that may be capable of assessing the heating loads and/or cooling loads within the defined temperature settings.
Additionally, there is potential to use the BERS Pro tool in a “BERS mode” (which is different to the mode used for NatHERS energy (star) rating) for modelling the building, as the tool in this mode allows for temperature settings to be adjusted to meet those prescribed in V22.214.171.124.
The ABCB have also recently released an Advisory Note on the types of software/modelling tools that can be used as part of applying V126.96.36.199, which can be found here .
It is important to note that the information provided herein is of a general nature and it is recommended that prior to using V188.8.131.52 for any house design and energy assessment that advice is sought from an energy assessor or the relevant approval authority to ensure that the assessment will comply with the BCA.
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