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System Design
6. Sound-proofing measures
D-28
Figure 5. Combined sound correction values
(4) Additional sound from reflections
●
Operating sound from outdoor units reflects from the walls of building and ground surfaces. These
reflections are received at the reception point, increasing the sound level of the system.
●
The sound received at the reception point is the sum of the sound propagated directly from the source plus
reflected sound.
The reflected sound level is obtained by establishing a virtual sound source (A'), and estimating the sound level
at B from A' (subtract the distance attenuation over the path A'-B). See the next paragraph on combining
sounds for a description of how to add direct and reflected sounds.
(5) Combining sounds
For multiple outdoor units, the sound level at the reception point is
determined by combining the sounds from each unit.
The combined sound from n units L
1
, L
2
, …L
n
is expressed by the
following formula.
If L = the combined sound level,
L = 10 log
10
(10
10
+ 10
10
+
・・・・・・
+ 10
10
)
For example, adding 61 phones and 62 phones gives
L = 10 log
10
(10
10
+ 10
10
) = 64.5 dB
This for of expression is applicable for any value of n.
Although sound level can be calculated this way, for simplicity, we have
prepared graphs to use instead.
<Calculation Example 1>
Calculate the combined sound level of L
1
= 62 [dB] and L
2
= 61 [dB]. L
1
– L
2
= 62 – 61 = 1 [dB], the correction value
from Figure 5 is 2.5 [dB], and 62 + 2.5 = 64.5 [dB], so the combined sound level is 64.5 [dB].
<Calculation Example 2>
To combine sound levels of 60, 64, 63 and 65 dB, first sort the values in order of magnitude.
65, 64, 63 and 60 dB
Then combine 65 and 64 dB to obtain the difference, 65 – 64 = 1 dB, which has a correction value of 2.5 dB, and
65 + 2.5 = 67.5 dB.
Next, combine 67.5 and 63 dB for a difference of 4.5 dB, for which the correction value is 1.3 dB, and 67.5 + 1.3 =
68.8 dB.
In the same way, combine 68.8 and 60 dB for level difference of 8.8 dB, for which the correction value is 0.5 dB.
And finally, 68.8 + 0.5 = 69.3 dB, which is the combined level of the four sounds.
65 64 63 60
Difference = 1
Correction value = 2.5
65+2.5=67.5
Difference = 4.5
Correction value = 1.3
67.5+1.3=68.8
Difference = 8.8
Correction value = 0.5
68.8 + 0.5 = 69.3 dB
B
○
●
●
A
’
●
●
●
’
Outdoor Unit
L1
L2 L3
62
61
Virtual sound source A'
Soun
d b
arri
er
Reception point
Sound source A
Reception point B
Reflected sound
(reflection surface)
Reception point B
Figure 7. Adding reflected sound
(ground surface)
Figure 6. Adding reflected sound (wall surface)
Содержание ECO G SGP-EW120M2G2W
Страница 3: ...A 1 System Configuration Contents 1 Type Configuration 1 Outdoor unit A 2 ...
Страница 12: ...Outdoor Unit 3 External Dimensions B 8 ...
Страница 13: ...Outdoor Unit 4 Wiring Diagram B 9 ...
Страница 14: ...Outdoor Unit 5 Performance Characteristics B 10 Cooling Heating SGP EW120M2G2W ...
Страница 15: ...Outdoor Unit 5 Performance Characteristics B 11 Cooling Heating SGP EW150M2G2W ...
Страница 16: ...Outdoor Unit 5 Performance Characteristics B 12 Cooling Heating SGP EW190M2G2W ...
Страница 17: ...Outdoor Unit 5 Performance Characteristics B 13 Cooling Heating SGP EW240M2G2W ...
Страница 18: ...Outdoor Unit 6 Operating Sound Level Characteristics B 14 1 Standard Mode ...
Страница 19: ...Outdoor Unit 6 Operating Sound Level Characteristics B 15 ...
Страница 20: ...Outdoor Unit 6 Operating Sound Level Characteristics B 16 ...
Страница 21: ...Outdoor Unit 6 Operating Sound Level Characteristics B 17 ...
Страница 22: ...Outdoor Unit 6 Operating Sound Level Characteristics B 18 2 Quiet Mode ...
Страница 23: ...Outdoor Unit 6 Operating Sound Level Characteristics B 19 ...
Страница 24: ...Outdoor Unit 6 Operating Sound Level Characteristics B 20 ...
Страница 25: ...Outdoor Unit 6 Operating Sound Level Characteristics B 21 ...
Страница 28: ...Control Related 1 System Block Diagram C 2 ...
Страница 29: ...Control Related 2 Remote Control Warning List C 3 ...
Страница 30: ...Control Related 2 Remote Control Warning List C 4 ...
Страница 31: ...Control Related 2 Remote Control Warning List C 5 ...
Страница 38: ...System Design 3 Refrigerant piping design D 7 2 Selecting system header and branch piping sizes ...
Страница 75: ...Installation Work 1 Points regarding refrigerant pipe work E 2 1 Points regarding branch pipe work APR P160BG ...
Страница 76: ...Installation Work 1 Points regarding refrigerant pipe work E 3 APR P680BG ...
Страница 77: ...Installation Work 1 Points regarding refrigerant pipe work E 4 APR P1350BG ...
Страница 78: ...Installation Work 1 Points regarding refrigerant pipe work E 5 APR CHP680BG APR CHP1350BG ...
Страница 83: ...Installation Work 2 Points regarding electrical work outdoor unit E 10 1 Wiring thickness and device capacity ...
Страница 85: ...Installation Work 2 Points regarding electrical work outdoor unit E 12 3 Precautions regarding electrical work ...
Страница 86: ...Installation Work 2 Points regarding electrical work outdoor unit E 13 ...
Страница 87: ...Installation Work 3 Outdoor unit installation work E 14 ...
Страница 88: ...Installation Work 3 Outdoor unit installation work E 15 ...
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Страница 105: ...Installation Work 3 Outdoor unit installation work E 32 ...
Страница 106: ...Installation Work 3 Outdoor unit installation work E 33 ...
Страница 107: ...F 1 Separately Sold Parts Contents 1 Outdoor unit related parts 1 Exhaust extension kit SGP PEX560K F 2 ...