77
Table 21. Results of ventilation measurements using passive tracer gas technique.
School
Measurement
period
ACH [h
-1
]
1a
Room 58, before
renov.
Feb. 1
st
to Feb. 8
th
2013
Normal week,
including a weekend
0,29 ± 15
%
1b
Room 58, after renov. Jan. 17
th
to Jan. 24
th
2014
Normal week,
including a weekend
0,40 ± 11
%
2a
Room 40, before
renov.
Feb. 1
st
to Feb. 8
th
2013
Normal week,
including a weekend
0,86 ± 15
%
2b
Room 40, after renov. Jan. 17
th
to Jan. 24
th
2014
Normal week,
including a weekend
0,45 ± 11
%
Figure 74. Stengårdsskolen, room 58 before renovation.
0
10
20
30
40
50
60
0
5
10
15
20
25
30
S
u
n
.
0
3
-
0
2
-
1
3
Mon
.
0
4
-
0
2
-
1
3
Tue
.
0
5
-
0
2
-
1
3
W
e
d
.
0
6
-
0
2
-
1
3
Thu
.
0
7
-
0
2
-
1
3
Fr
i.
0
8
-
0
2
-
1
3
S
a
t
.
0
9
-
0
2
-
1
3
R
H
[
%
]
T
e
m
p.
[
C]
Room 58. Before renovation
0
500
1000
1500
2000
2500
3000
S
u
n
.
0
3
-
0
2
-
1
3
M
on.
04-
02-
13
Tue
.
0
5
-
0
2
-
1
3
Wed.
06-
02-
13
Thu
.
0
7
-
0
2
-
1
3
Fr
i.
0
8
-
0
2
-
1
3
S
a
t
.
0
9
-
0
2
-
1
3
C
O2
-
conc.
[ppm
]
Room 58. Before renovation