Lossnay Core Sound Reducing Properties Test - Mitsubishi Electric Lossnay series Technical Manual

6. Lossnay Core Sound Reducing Properties Test

Because the Lossnay Core is made of many layers of plates and the permeable holes are extremely small, the core has
outstanding sound reducing properties and is appropriate for ventilation in soundproof rooms.
For example, LGH-100RX -E has sound reducing characteristics of 35.0dB with a center frequency of 500Hz, which means
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that a sound source of 84.4dB can be shielded to 49.4dB.
Test number IVA-01-06
Mitsubishi Electric Corporation
Name
1-3, Komaba-cho, Nakatsugawa-shi,
Address Gifu 508-8666, Japan
Trade name LGH-100RX
Main composition
Air-to-Air Energy Recovery Ventilator
Manufacture date
May 18, 2001
W1231 × H398 × D1521
Size (unit : mm)
(ANNEXED DRAWINGS No.1,2 show details.)
Joint adapter in the sound receiving room side
(Portion A in ANNEXED DRAWING No.1) had
been filled with oil clay and then covered with
Note
onefold aluminum tape, sound insulation sheet
and glass wool around duct successively.
Date of test
Sound transmitting size
Air temperature, Relative humidity
Average sound pressure level (dB)
Center
frequency Source Receiving
(Hz) room Ls room Lr
100 83.3 59.3
83.8 62.8
125
160 85.5 61.0
200 86.0 58.7
250 86.1 58.3
315 85.0 57.0
400 86.2 54.3
500 84.4 49.4
84.7 50.7
630
800 85.5 48.7
1000 87.0 47.7
1250 89.2 47.7
1600 89.3 47.4
2000 90.7 47.0
2500 92.8 48.2
48.2
3150 83.4
4000 95.0 48.8
5000 95.0 47.6
Notes:
1. The graph shows level difference with (revised) sound transmission loss.
2. Test specimen area (Sound transmitting area) is:
S = 0.10134m (Ф254mm × 2) for calculating (revised) sound transmission
2
loss.
3. An arithmetic mean of revised sound transmission loss (1/3 octave, 125Hz
- 4000Hz)....18.4dB
CHAPTER 3
Sound Reducing Effect Test Results
-E
3
May 18, 2001
Ф254 mm × 2
22.0∞C, 62%RH (Receiving room)
Equivalent Sound
absorption transmission
Level
area in receiving loss
difference D
room A (m ) TL (dB)
2
24.0 2.65 10
21.0 3.21 6
24.5 3.69 9
27.3 3.48 12
27.8 3.54 12
28.0 3.96 12
4.40 16
31.9
35.0 4.62 18
34.0 4.80 17
36.8 5.06 20
39.3 5.58 22
41.5 6.26 24
41.9 7.03 23
7.57 25
43.7
44.6 8.62 25
45.2 10.19 25
46.2 12.42 25
47.4 15.51 26
•
General Technical Considerations
Test method was determined according to JIS A 1416 : 1994
"Method for laboratory measurement of sound transmission
loss" and Architectural Institute of Japan Standard
"Measurement method on sound transmission loss of small
building elements".
300 300
Air layer (t50)
Chain block (2t)
Sound source side
Sound receiving side
Neoprene rubber
Test specimen
Filled with sand
Cavity concrete block (t190)
Filled inside with sand
Mortared both sides (15mm)
F. L.
Section
Heat & Acoustics Laboratory, Building Physics Dept.
Test
General Building Research Corporation of Japan
laboratory
5-8-1 Fujishirodai, Suita-shi, Osaka 565-0873, Japan
Revised sound
transmission
loss
TLc (dB)
70
11
6
10
60
13
13
12 50
16 Level difference between
the source room and the
19
receiving room
40
17
20
22
30
24
23
25
20
25
25
10
25
26
0
125
Responsible parties
Sound receiving side Sound source side
(Reverberation room No. 3) (Reverberation room No. 2)
Volume
180.0m 178.5m 3 3
Test
specimen
Test specimen
SP.
MIC.
2 ch selector Amplifier
Real time analyzer Equalizer
Computer system Noise generator
Printer
Fig. 1 Testing setup (Unit : mm)
Air-to-Air Energy
Recovery Ventilator
LGH-100RX -E
3
Revised sound
transmission loss
Sound transmission loss
250 500 1000 2000 4000
Center frequency (Hz)
Iwao Kurahashi (Head)
Takao Waki (Section chief)
Mitsuo Morimoto (Section chief)
U-31