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Part J0 Energy Efficiency
J0.0 Deemed-to-Satisfy Provisions
Where a Deemed-to-Satisfy Solution is proposed , Performance RequirementsJP1 and JP3 are satisfied by complying with—
Where a Performance Solution is proposed, the relevant Performance Requirements must be determined in accordance with A0.7.
To clarify that and will be satisfied if compliance is achieved with to .
Where a solution is proposed to comply with the Deemed-to-Satisfy Provisions, clarifies that compliance with to achieves compliance with and .
Where a Performance Solution is proposed, the relevant Performance Requirements must be determined in accordance with . (See comment on A0.7).
The Deemed-to-Satisfy Provisions described are limited to the most common forms of construction and the simplest forms of buildings. It is expected that the more innovative construction techniques and the more complex buildings will be designed and assessed using a performance approach.
The measures have been developed using a cost-effectiveness model.
A major consideration in developing the measures was the likelihood of a building being heated or cooled by an air-conditioning system, and whether the Deemed-to-Satisfy Provisions should assume this to be the case, or only apply the provisions if a heating or cooling system is installed. It is recognised that most Class 3, 5, 6 and 9 buildings and some Class 7 and 8 buildings are heated or cooled, and this is the basis of the provisions. Consideration was also given to the fact that although the first owner may be prepared to ‘manage’ their building in the appropriate manner, the next owner or tenant may not, and instead may install air-conditioning.
Because of the performance-based structure of the BCA, a Performance Solution may be proposed instead of the Deemed-to-Satisfy Provisions.
J0.1 Application of Section J
Performance Requirementsand are satisfied by complying with—
for reducing the heating or cooling loads—
of sole-occupancy units of a Class 2 building or a Class 4 part of a building, J0.2 and J0.3; and
of a Class 2 to 9 building, other than the sole-occupancy units of a Class 2 building or a Class 4 part of a building, Parts J1, J2 and J3; and
for air-conditioning and ventilation, Part J5; and
for artificial lighting and power, Part J6; and
for heated water supply and swimming pool and spa pool plant, Part J7; and
for facilities for monitoring, Part J8.
To clarify which provisions of Section J apply to dwellings and which provisions apply to other buildings.
explains which provisions need to be complied with for—
- a sole-occupancy unit of a Class 2 building or a Class 4 part; and
- all other classifications.
explains that, for the thermal performance of the building fabric, there are two paths for compliance depending on whether the building contains dwellings (i.e. sole-occupancy units in a Class 2 building or a Class 4 part) or not. For the fabric of dwellings, compliance must be in accordance with while for other uses, compliance must be in accordance with to . For services, all buildings must comply with to .
All buildings must comply with to , including sole-occupancy units of a Class 2 building or Class 4 part, due to these matters not being assessed by house energy rating software.
The means of compliance is explained in Figure J0.1.
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Figure J0.1 FLOW CHART OF COMPLIANCE WITH SECTION J0 |
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J0.2 Heating and cooling loads of sole-occupancy units of a Class 2 building or a Class 4 part
The sole-occupancy units of a Class 2 building or a Class 4 part of a building must—
for reducing the heating or cooling loads—
collectively achieve an average energy rating of not less than 6 stars; and
individually achieve an energy rating of not less than 5 stars,
using house energy rating software; and
for general thermal construction, comply with J1.2; and
for compensating for a loss of ceiling insulation, comply with J1.3(c), other than where the house energy rating software used can automatically compensate for a loss of ceiling insulation; and
for building sealing, comply with Part J3.
To clarify how the shell of a sole-occupancy unit of a Class 2 building or a Class 4 part are to comply.
In order to reduce the heating or cooling loads, the fabric of a sole-occupancy unit of a Class 2 building or a Class 4 part must achieve the required house energy rating. It must also comply with a few general Deemed-to-Satisfy Provisions relating to the insulation standard, installation of insulation, thermal breaks, sealing, etc.
The measures for a sole-occupancy unit of a Class 2 building or a Class 4 part of a building are similar to those adopted for Class 1 buildings in BCA Volume Two - Housing Provisions. There are several reasons for this, including:
- Many Class 2 and 4 buildings are very similar in thermal performance to Class 1 buildings.
- Being dwellings, there are similarities in their use with high occupancy at night.
- Having all types of dwellings achieving comparable performance provides a consistent approach.
J0.3 Ceiling fans
Ceiling fans required as part of compliance with J0.2(a), must—
be permanently installed; and
have a speed controller; and
serve the whole room, with the floor area that a single fan serves not exceeding—
15 m2 if it has a blade rotation diameter of not less than 900 mm; and
25 m2 if it has a blade rotation diameter of not less than 1200 mm.
To set the minimum requirements for ceiling fans.
A ceiling fan may be required to provide high air movement as part of a house energy rating software solution and two sizes of fans are described in terms of their diameter and the floor area they serve.