Sound data, Method of sound measurement, Semi hemispherical – Airedale Dry coolers DR10 User Manual
Page 17: Sound data - standard fan, Dr10-95, Dry coolers, Important
DR10-95
DRY COOLERS
Dry coolers
17
Technical Manual :6877401 V1.1.0 02_2013
Sound Data
METHOD OF SOUND
MEASUREMENT
All sound data quoted has been measured in the third-octave band limited values, using
a Real Time Analyser calibrated sound intensity meter in accordance with
BS EN ISO9614 Part 1: 1995.
All Sound Power Levels quoted are calculated from measured sound intensity according
BS EN ISO9614 Part 1: 1995.
SEMI HEMISPHERICAL
Sound Pressure Levels are calculated from sound power using the semi-hemispherical
method where the noise source is in junction with 2 boundaries i.e. the floor and 1 wall.
SOUND DATA - STANDARD FAN
IMPORTANT
The sound data quoted is based on the unit having the STANDARD FAN running at
FULL SPEED under normal operating conditions.
For sound data of optional fan selections, please contact Airedale.
Horizontal
Sound
Overall
dB(A)
Frequency (Hz) dB
Measurement
63
125
250
500
1000
2000
4000
8000
DR10
Power
74
72
83
76
68
68
65
60
50
Pressure
@10m
46
44
55
48
40
40
37
32
22
DR12
Power
74
72
83
76
68
68
65
60
50
Pressure
@10m
46
44
55
48
40
40
37
32
22
DR15
Power
78
82
87
74
74
73
70
63
62
Pressure
@10m
50
54
59
46
46
45
42
35
34
DR20
Power
82
83
80
82
79
78
74
67
59
Pressure
@10m
54
55
52
54
51
50
46
39
31
DR25
Power
78
82
87
74
74
73
70
63
62
Pressure
@10m
50
54
59
46
46
45
42
35
34
DR30
Power
82
83
80
82
79
78
74
67
59
Pressure
@10m
54
55
52
54
51
50
46
39
31
DR35
Power
81
85
90
77
77
76
73
66
65
Pressure
@10m
53
57
62
49
49
48
45
38
37
DR45
Power
85
86
83
85
82
81
77
70
62
Pressure
@10m
57
58
55
57
54
53
49
42
34
DR40
Power
81
85
90
77
77
76
73
66
65
Pressure
@10m
53
57
62
49
49
48
45
38
37
DR50
Power
85
86
83
85
82
81
77
70
62
Pressure
@10m
57
58
55
57
54
53
49
42
34
DR55
Power
83
80
90
80
77
79
75
68
67
Pressure
@10m
55
52
62
52
49
51
47
40
39
DR70
Power
87
88
85
87
84
83
79
72
64
Pressure
@10m
59
60
57
59
56
55
51
44
36
DR75
Power
82
80
90
80
77
79
75
68
67
Pressure
@10m
55
52
62
52
49
51
47
40
39
DR95
Power
87
88
85
87
84
83
79
72
64
Pressure
@10m
59
60
57
59
56
55
51
44
36