J1V5 Internal Heat Loads
Internal heat loads refer to the amount of heat generated within a building or a specific space due to various internal sources. Table S45C3d provide assumptions for occupancy, lighting, cooking and appliances, which are then used against the applicable schedule.
Table S45C3d with internal heat loads for lighting, cooking, and appliances
Sole-occupancy unit area (excluding garage) (m2)
Occupancy (m2/person)
Daytime lighting power density (6:00 am to 6:00 pm) (W/m2)
Night-time lighting power density (6:00 pm to 6:00 am) (W/m2)
Cooking in kitchen zone only (W/m2 kitchen area)
Appliances (except oven) in whole sole-occupancy unit (W/m2)
≤ 100
41.2
4.0
4.0
36.2
4.38
> 100 to ≤ 125
44.3
4.0
4.0
34.7
3.52
> 125 to ≤ 150
47.8
4.0
4.0
28.9
2.99
> 150 to ≤ 175
51.7
4.0
4.0
24.8
2.60
> 175 to ≤ 200
55.8
4.0
4.0
25.3
2.26
> 200 to ≤ 225
60.0
4.0
4.0
22.5
2.02
> 225 to ≤ 250
64.4
4.0
4.0
20.2
1.84
> 250 to ≤ 275
68.9
4.0
4.0
18.4
1.68
> 275 to ≤ 300
73.3
4.0
4.0
16.9
1.55
> 300 to ≤ 325
77.5
4.0
4.0
15.6
1.44
> 325 to ≤ 350
81.6
4.0
4.0
14.5
1.34
> 350 to ≤ 375
85.4
4.0
4.0
13.5
1.26
> 375
89.0
4.0
4.0
12.7
1.19
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