ZEMCH 2019 International Conference Proceedings April.2020 | Page 251
Criterion 2
“Daily weighted exceedance” (W e ) in any one day
>6° h
Criterion 3
Maximum temperature level (T upp ) ΔT > 4° K
* Refer to nomenclature for more information.
0 day
0 h
3. Results
Overall, twenty‐four different combination scenarios were simulated. The results are reported for
six distinct zones for three building geometries, two main construction methods, and two ventilation
strategies as follows:
Geometry:
One window (single sided ventilation)
Two windows (cross ventilation)
Two windows and roof vent
Construction method:
Walls:
1. Brick walls
2. Hollow concrete walls
Roof:
3. • Iron sheet
4. • Insulated iron sheet
Ventilation strategies
SV: Normal ventilation (windows/vents open 6:30 am‐6:30pm; doors open 7 am‐8 pm)
NV: Night Ventilation (windows/vents opened permanently; doors open 7 am‐8 pm)
Previous studies revealed the excessive effects of iron sheet roof on indoor conditions [14] in low‐
income housing in Uganda. The scenarios were therefore categorised under two different categories of
A) normal roof: iron sheet and B) insulated roof: internally insulated iron sheet, to assess the effects of
natural ventilation strategies in both conditions. For the purpose of the analysis and ease of reference,
an ID has been allocated to each simulated scenario. The SV refers to Simple/Normal Ventilation and
NV refers to Night Ventilation. Table 3 summarises the analysed combinations.
Table 3. Tested scenarios
Category A: Uninsulated roof
ID
Zones
Wall
Construction
Roof
construction
Windows
Roof Vent
Doors
TV
1
SV/NV
Z1
Brick
Iron
sheet
1
None
1
2
2 SV/NV
Z2
Hollow
Concrete
Iron sheet
1
None
1
2
3
SV/NV
Z3
Brick
Iron
sheet
2
None
1
3
4 SV/NV 5 SV/NV 6 SV/NV
Z4
Hollow
Concrete Z5
Z6
Hollow
Concrete
Brick
Iron sheet Iron sheet Iron sheet
2
None
1
3 2
1
1
3 2
1
1
3
Effects of Natural Ventilation on Thermal Comfort in Low-income Tropical Housing
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