14
Table 4
Average air changes per 24 hours for storage rooms
above 32ºF. (0ºC.) due to door openings and infiltration.
Air
Air
Air
Volume
Changes
Volume
Changes
Volume
Changes
Cu. Ft.
Per 24hrs.
Cu. Ft.
Per 24hrs.
Cu. Ft.
Per 24hrs.
200
44.0
2,000
12.0
25,000
3.0
250
38.0
3,000
9.5
30,000
2.7
300
34.5
4,000
8.2
40,000
2.3
400
29.5
5,000
7.2
50,000
2.0
500
26.0
6,000
6.5
75,000
1.6
600
23.0
8,000
5.5
100,000
1.4
800
20.0
10,000
4.9
150,000
1.2
1,000
17.5
15,000
3.9
200,000
1.1
1,500
14.0
20,000
3.5
300,000
1.0
Air
Air
Air
Volume
Changes
Volume
Changes
Volume
Changes
Cu. Ft.
Per 24hrs.
Cu. Ft.
Per 24hrs.
Cu. Ft.
Per 24hrs.
200
33.5
2,000
9.3
25,000
2.3
250
29.0
3,000
7.4
30,000
2.1
300
26.2
4,000
6.3
40,000
1.8
400
22.5
5,000
5.6
50,000
1.6
500
20.0
6,000
5.0
75,000
1.3
600
18.0
8,000
4.3
100,000
1.1
800
15.3
10,000
3.8
150,000
1.0
1,000
13.5
15,000
3.0
200,000
0.9
1,500
11.0
20,000
2.6
300,000
0.85
Table 5
Average air changes per 24 hours for storage rooms
below 32ºF. (0ºC.) due to door openings and infiltration.
ºF.
ºC.
70
80
70
80
50
60
50
60
50
60
50
60
55
12.8
–
–
–
–
1.12
1.34
1.41
1.66
1.72
2.01
2.06
2.44
50
10.0
–
–
–
–
1.32
1.54
1.62
1.87
1.93
2.22
2.28
2.65
45
7.2
–
–
–
–
1.50
1.73
1.80
2.06
2.12
2.42
2.47
2.85
40
4.4
–
–
–
–
1.69
1.92
2.00
2.26
2.31
2.62
2.67
3.65
35
1.7
–
–
0.36
0.41
1.86
2.09
2.17
2.43
2.49
2.79
2.85
3.24
30
-1.1
0.24
0.29
0.58
0.66
2.00
2.24
2.26
2.53
2.64
2.94
2.95
3.35
25
-3.9
0.41
0.45
0.75
0.83
2.09
2.42
2.44
2.71
2.79
3.16
3.14
3.54
20
-6.7
0.56
0.61
0.91
0.99
2.27
2.61
2.62
2.90
2.97
3.35
3.33
3.73
15
-9.4
0.71
0.75
1.06
1.14
2.45
2.74
2.80
3.07
3.16
3.54
3.51
3.92
10
-12.2
0.85
0.89
1.19
1.27
2.57
2.87
2.93
3.20
3.29
3.66
3.64
4.04
5
-15.0
0.98
1.03
1.34
1.42
2.76
3.07
3.12
3.40
3.48
3.87
3.84
4.27
0
-17.8
1.12
1.17
1.48
1.56
2.92
3.23
3.28
3.56
3.64
4.03
4.01
4.43
-5
-20.6
1.23
1.28
1.59
1.67
3.04
3.36
3.41
3.69
3.78
4.18
4.15
4.57
-10
-23.3
1.35
1.41
1.73
1.81
3.19
3.49
3.56
3.85
3.93
4.33
4.31
4.74
-15
-26.1
1.50
1.53
1.85
1.92
3.29
3.60
3.67
3.96
4.05
4.46
4.42
4.86
-20
-28.9
1.63
1.68
2.01
2.00
3.49
3.72
3.88
4.18
4.27
4.69
4.66
5.10
-25
-31.7
1.77
1.80
2.12
2.21
3.61
3.84
4.00
4.30
4.39
4.80
4.78
5.21
-30
-34.4
1.90
1.95
2.29
2.38
3.86
4.05
4.21
4.51
4.56
5.00
4.90
5.44
Storage
Temperature of Outside Air
Room
40ºF. (4.4ºC.)
50ºF. (10ºC.)
85ºF. (29.4ºC.)
90ºF. (32.2ºC.)
95ºF. (35ºC.)
100ºF. (37.8ºC.)
Temp.
Relative Humidity of Outside Air, %
Table 6
Heat removed in cooling air storage room conditions
(BTU per Cu. Ft.)
Table 3, 4 & 5 extracted and reprinted by permission from ASHRAE 1972 Handbook of Fundamentals.
Table 6 extracted and reprinted by permission from ASHRAE 1967 Handbook of Fundamentals.
Note: For heavy usage multiply the above values by 2.0
For long storage multiply the above values by 0.6
