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NABERS Energy Guide to Building Energy Estimation
Shading is to be modelled in detail. For Greenstar, moveable shading must be represented as movable
or otherwise in the fixed position that is most disadvantageous to the building’s daylight performance.
2.6 Simulation of internal loads
The key internal loads are lighting and office equipment. Overnight energy use of these systems can
severely affect all rating types. It is essential to model this realistically rather than on the basis of
idealized habits. Refer to Section 5 for default figures to be used if no information on the proposed
internal loads is available and when simulating for the purposes of a Green Star rating. However, in all
cases, consideration is to be given to the factors below:
2.6.1 Lighting Power Density
The installed lighting power shall be assessed from the reverse ceiling plans for the tenancy. If the tenant fitout is
unknown, allowance should be made for the possible increase in lighting power density caused by the fitout.
The power consumption used for individual fittings shall include the power consumption of the lamp plus any
associated control gear and transformers. The total circuit watts of these components should be confirmed by
manufacturers’ data or by in-situ measurement.
Toilets, lift lobbies, plant rooms and foyers are to be represented with different lighting power density levels
(providing this is true in reality).
2.6.2 Lighting Hours of Use
Overnight lighting energy use can severely impact upon the total energy use of a building. The lighting schedule
should be chosen to represent the expected operating patterns for the tenancy. Such patterns may reasonably be
derived by enquiry into the operating patterns of the tenants in their previous tenancy, if the switching technologies
are similar. If such operating patterns are not known, then the default schedules provided with this document may
be used and/or the defaults provided below used to assist in developing a probable pattern. Modellers are advised
to give particular consideration of the after hours operation of lights.
Consideration of cleaner’s hours is recommended as these can have a strong effect on the lighting hours. Careful
consideration should be given to the likely interaction of the operation of cleaners with the proposed lighting
2.6.3 Lighting Controls
Lighting controls are to be modelled realistically. Most simulation models have the ability to model
daylighting controls; if this is not the case then either this function is not to be modelled, a different
simulation model is to be chosen or a detailed and separate assessment of daylighting effects undertaken
and incorporated into the model. Occupancy detector systems will require some judgement in their
modelling. A conservative assessment would make little allowance for savings during the day but would
still recognize the economies at the beginning and the end of the day. The default methodology provides
some additional methodologies which may be used to assist in this process.
2.6.4 Equipment Loads
If the tenant fitout is known, the loads should be modelled to represent the actual loads in the site.
Suggested load figures are available under the default methodologies of the NABERS Guide to Tenant
Energy Estimation. Loads based on tenant fitouts should be modelled on a zonal basis to ensure that the
variability of loads passed through to the air-conditioning is captured in the modelling.
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Version 2011-June