Nationwide House Energy Rating Scheme (NatHERS) - Internal sensible and latent loads
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Internal sensible and latent loads
Heat loads exist within buildings due to latent heat energy of moisture in the air, human activity (people are
a source of heat energy), and non-thermal comfort related energy consumption. Base heat loads are
defined in NatHERS to include heat generated from cooking, lighting, electrical appliances and from
people. These loads are applied according to the primary function or functions of the room (such as
cooking or sleeping), and the time of day a room is expected to be used.
The heat loads in the following table are for a 160 m2 dwelling with two adults and two children, with a
floor area split of 80 m2 for all the living areas and 80 m2 for all the bedroom areas. Suitable adjustments
should be made for houses with different total areas, and for individual spaces with different areas. The
load is for the one hour period up to the time stated i.e. a time of 1:00 am indicates the period between
midnight and 1:00 am.
For living spaces, including kitchens
TimeSensible heat load (Watts) Latent heat
load (Watts)Appliances
and cookingLighting People Total
1:00 am 100 0 0 100 0
2:00 am 100 0 0 100 0
3:00 am 100 0 0 100 0
4:00 am 100 0 0 100 0
5:00 am 100 0 0 100 0
6:00 am 100 0 0 100 07:00 am 100 0 0 100 0
8:00 am 400 180 280 860 400
9:00 am 100 180 280 560 200
10:00 am 100 0 140 240 100
11:00 am 100 0 140 240 100
Noon 100 0 140 240 100
1:00 pm 100 0 140 240 100
2:00 pm 100 0 140 240 100
3:00 pm 100 0 140 240 100
4:00 pm 100 0 140 240 100
5:00 pm 100 0 140 240 100
6:00 pm 100 300 210 240 150
7:00 pm 1100 300 210 1610 750
8:00 pm 250 300 210 760 150
9:00 pm 250 300 210 760 150
10:00 pm 250 300 210 760 150
11:00 pm 100 0 0 100 0
Midnight 100 0 0 100 0
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For living spaces that do not include a kitchen
Time
Sensible heat load (Watts)Latent heat
load (Watts)Appliances
and cookingLighting People Total
1:00 am 0 0 0 0 0
2:00 am 0 0 0 0 03:00 am 0 0 0 0 0
4:00 am 0 0 0 0 0
5:00 am 0 0 0 0 0
6:00 am 0 0 0 0 0
7:00 am 0 0 0 0 0
8:00 am 0 180 280 460 140
9:00 am 0 180 280 460 140
10:00 am 0 0 140 140 70
11:00 am 0 0 140 140 70
Noon 0 0 140 140 70
1:00 pm 0 0 140 140 70
2:00 pm 0 0 140 140 70
3:00 pm 0 0 140 140 70
4:00 pm 0 0 140 140 70
5:00 pm 0 0 140 140 70
6:00 pm 0 300 210 510 105
7:00 pm 0 300 210 510 105
8:00 pm 0 300 210 510 105
9:00 pm 0 300 210 510 105
10:00 pm 0 300 210 510 105
11:00 pm 0 0 0 0 0
Midnight 0 0 0 0 0
For bedrooms
TimeSensible heat load (Watts) Latent heat
load (Watts)Lighting People Total
1:00 am 0 200 200 100
2:00 am 0 200 200 100
3:00 am 0 200 200 100
4:00 am 0 200 200 100
5:00 am 0 200 200 1006:00 am 0 200 200 100
7:00 am 0 200 200 100
8:00 am 0 0 0 0
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9:00 am 0 0 0 0
10:00 am 0 0 0 0
11:00 am 0 0 0 0
Noon 0 0 0 0
1:00 pm 0 0 0 0
2:00 pm 0 0 0 0
3:00 pm 0 0 0 0
4:00 pm 0 0 0 0
5:00 pm 0 0 0 0
6:00 pm 0 0 0 0
7:00 pm 0 0 0 0
8:00 pm 100 0 100 0
9:00 pm 100 0 100 0
10:00 pm 100 0 100 0
11:00 pm 100 200 300 100
Midnight 0 200 200 100
Administered by the Department of Climate Change and Energy Efficiency
on behalf of the Ministerial Council on Energy
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Last modified 10 September 2008
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