ZEMCH 2019 International Conference Proceedings April.2020 | Page 252
Category B: Insulated roof
ID
Zones
Wall
Construction
Roof
construction
Windows
Roof Vent
Doors
TV
7 SV/NV
Z7
Brick
Insulated iron
sheet
1
None
1
2
8 SV/NV
Z8
Hollow
Concrete
Insulated
iron sheet
1
None
1
2
9 SV/NV
Z9
Brick
Insulated
iron sheet
2
None
1
3
10 SV/NV
Z10
Hollow
Concrete
Insulated
iron sheet
2
None
1
3
11 SV/NV
Z11
Brick
Insulated
iron sheet
2
1
1
3
12 SV/NV
Z12
Hollow
Concrete
Insulated
iron sheet
2
1
1
3
Category A: Natural ventilation in buildings with iron sheet roof
According to the results, although there were some improvements, for category A with iron sheet
roof, none of the natural ventilations strategies were effective enough to pass thermal comfort
requirements.
Table 4 and Table 5 summarise the results of simulations for daytime and night ventilation
strategies. The results indicate that, compared to daytime ventilation, there has been marginal
improvement for all similar scenarios when night ventilation is considered (e.g. 1 SV compared to 7
NV). Similar improvements are observed for cross ventilation compared to single sided ventilation. The
situation is enhanced when cross ventilation is combined with roof vent.
Thermal comfort conditions are significantly better for brick walls compared with hollow concrete
walls however ventilation strategies seem to be more effective for buildings with hollow concrete walls.
improvements are more significant. According to the results the best performance is achieved for
buildings with brick walls when cross and roof ventilation along with night ventilation are introduced
(ID: 11 NV). For this scenario, compared to the base case scenario (ID: 1 SV); there have been 22%, 38%
and 43% improvements for criteria 1, 2, and 3, respectively.
Table 4. Thermal comfort criteria for continuous daytime ventilation with iron sheet roof.
ID
Description *
1 SV
B wall, 1 W
2 SV
HC wall, 1 W
3 SV
B wall, 2 W
4 SV
HC wall, 2 W
5 SV B wall, 2 W & RV
6 SV HC wall, 2 W & RV
Criterion 1 (%)
12.69%
18.74%
12.07%
17.66%
10.35%
Criterion 2
Criterion 3
(Daily degree‐hours over 6) (ΔT over 4 K)
127
14
232
163
119
14
211
121
82
9
16.03%
191
75
* B: Brick; HC: Hollow Concrete; W: Window; RV: Roof Vent
Table 5: Thermal comfort criteria for continuous daytime and night ventilation with iron sheet roof
241
ID Description * Criterion 1 (%)
7 NV
8 NV
9 NV
10 NV B wall, 1 W
HC wall, 1 W
B wall, 2 W
HC wall, 2 W 12.39%
18.58%
11.63%
17.39%
Criterion 2
Criterion 3
(Daily degree‐hours over 6) (ΔT over 4 K)
123
14
232
159
109
13
210
118
ZEMCH 2019 International Conference l Seoul, Korea