الطريقة الصحيحة لقياس مستوى الصوت من التكييف Method Statement to Measure Noise Level of A/C

1. Method Statement to Measure
Noise Level of A/C-by Getco
‫لقياس‬ ‫الصحيحة‬ ‫الطريقة‬
‫التكييف‬ ‫من‬ ‫الصوت‬ ‫مستوى‬

2. Acoustic Comfort - ‫الراحة‬ ‫منطقة‬‫الصوتية‬
Acoustic comfort
means having the
right level and
quality of noise to
use the space as
intended by
International
Standard.
‫الصوتية‬ ‫الراحة‬ ‫منطقة‬
‫المستوى‬ ‫تحقيق‬ ‫تعنى‬
‫ك‬ ‫فى‬ ‫للصوت‬ ‫الصحيح‬‫ل‬
‫له‬ ‫المقدرة‬ ‫بالحدود‬ ‫حيز‬
‫العالمي‬ ‫المقاييس‬ ‫حسب‬‫ة‬.

3. Importance - ‫األهمية‬
People are more
productive & happy
when they’re not
distracted by noises
from outside or from
surrounding spaces and
occupants. Acoustic
comfort is especially
important for schools,
hospitals & office BLD.
Not to forget Bedrooms
‫األ‬ ‫فى‬ ‫تزيد‬ ‫الناس‬ ‫أنتاجية‬‫ماكن‬
‫عملهم‬ ‫يقطع‬ ‫ال‬ ‫عندما‬ ‫و‬ ‫الهادئة‬
‫أو‬ ‫الخارج‬ ‫من‬ ‫إزعاج‬ ‫أي‬
‫إزعاج‬ ‫أو‬ ‫الداخلى‬ ‫المحيط‬
‫المكان‬ ‫شاغلى‬ ‫من‬ ‫مفاحئ‬,‫و‬
‫شعورهم‬ ‫على‬ ‫ذلك‬ ‫ينعكس‬
‫بالسعادة‬.
‫فى‬ ‫جدا‬ ‫مهمة‬ ‫الصويتة‬ ‫الراحة‬
‫المدارس‬ ‫مثل‬ ‫الحساسة‬ ‫األماكن‬
‫و‬ ‫المكاتب‬ ‫و‬ ‫المستشفيات‬ ‫و‬‫ال‬
‫النوم‬ ‫غرف‬ ‫نغفل‬ ‫أن‬ ‫يمكن‬.

4. Environmental Noise-‫البيئة‬ ‫من‬ ‫اإلزعاج‬
Step-0:
Review the
international Noise
level standard.
Such as:
‫الخطوة‬-0:
‫المستويات‬ ‫مراجعة‬
‫لمستوى‬ ‫العالمية‬
‫الصوت‬,‫مثل‬:
Two Levels Per Day:
• Night from: 10 p.m. to 7 a.m.
• Day from: 7 a.m. to 10 p.m.
‫اليوم‬ ‫فى‬ ‫مختلفين‬ ‫مستويين‬:
•‫من‬ ‫ليال‬10‫إلى‬ ‫مساءا‬7‫صباحا‬.
•‫من‬ ‫نهارا‬7‫إلى‬ ‫ضباحا‬10‫مساءا‬.
EPA: Environmental Protection Agency

7. ‫إماراتية‬ ‫مقاييس‬:‫دبي‬ ‫بلدية‬
UAE Standards: Dubai Municipality

8. ‫إماراتية‬ ‫مقاييس‬:‫الحرة‬ ‫للمناطق‬ ‫تراخيص‬
UAE Standards: Trakhees – Free Zones

9. Environmental Noise-‫البيئة‬ ‫من‬ ‫اإلزعاج‬
Step-1A:
Turn Off all A/C units
and Ventilators and
register Noise Level
from surrounding
outside environment.
‫الخطوة‬-1‫أ‬:
‫أجهزة‬ ‫كافة‬ ‫إطفاء‬
‫و‬ ‫التهوية‬ ‫و‬ ‫التكييف‬
‫الص‬ ‫مستوى‬ ‫تسجيل‬‫وت‬
‫الخ‬ ‫بالبيئة‬ ‫المتأثر‬‫ارجية‬.
We advice to register NL:
• Night @ least movement.
• Day time @ max. movement.
‫المستوى‬ ‫بتسجيل‬ ‫ينصح‬:
•‫ممكن‬ ‫إزعاج‬ ‫أقل‬ ‫فى‬ ‫ليال‬.
•‫الحركة‬ ‫مستوى‬ ‫أكثر‬ ‫فى‬ ‫نهارا‬.

10. Environmental Noise-‫البيئة‬ ‫من‬ ‫اإلزعاج‬

11. Environmental Noise-‫البيئة‬ ‫من‬ ‫اإلزعاج‬
Step-1B:
Turn Off any Electrical
Appl. (Washing ..) or
Mechanical (Pump..) and
register Noise Level from
surrounding outside
environment.
‫الخطوة‬-1‫ب‬:
‫أجهزة‬ ‫أية‬ ‫كافة‬ ‫إطفاء‬
‫كهربائية‬(‫غسالة‬)..‫أو‬
‫ميكانيكية‬(‫مضخة‬)..‫و‬
‫الصوت‬ ‫مستوى‬ ‫تسجيل‬
‫الخار‬ ‫بالبيئة‬ ‫المتأثر‬‫جية‬.
We advice to register NL:
• Night @ least movement.
• Day time @ max. movement.
‫المستوى‬ ‫بتسجيل‬ ‫ينصح‬:
•‫ممكن‬ ‫إزعاج‬ ‫أقل‬ ‫فى‬ ‫ليال‬.
•‫الحركة‬ ‫مستوى‬ ‫أكثر‬ ‫فى‬ ‫نهارا‬.

12. Duct Borne Noise-‫الهواء‬ ‫قنوات‬ ‫من‬ ‫اإلزعاج‬
Step-2:
Register 3-5 meters
from Supply Air
Diffuser to register
Noise Level borne in
Ducts.
‫الخطوة‬-2:
‫من‬ ‫بعد‬ ‫على‬ ‫التسجيل‬3-
5‫دفع‬ ‫فتحة‬ ‫عن‬ ‫أمتار‬
‫مستوى‬ ‫لقياس‬ ‫الهواء‬
‫فى‬ ‫المنقول‬ ‫الهواء‬ ‫صوت‬
‫القنوات‬
We advice to review:
• Duct sizing according to proper
ESP Drop
• Acceptable ESP: 0.1”.W.G
(25Pa).
‫بمراجعة‬ ‫ينصح‬:
•‫ق‬ ‫تصميم‬ ‫تم‬ ‫الذى‬ ‫اإلختكاك‬ ‫مستوى‬‫ياس‬
‫أساسه‬ ‫على‬ ‫الهواء‬ ‫قنوات‬.
•‫المقبول‬ ‫المستوى‬:0.1‫إنشزماء‬
(25Pa)

13. As per manufacturer recommendation
ESP (25 Ps) 0.1” W. Gauge is consider min.

14. Page(7)

15. Page(10)

16. We recommend
to consider ESP
of 0.05” W.
Gauge when
feeding one zone

17. ‫مقارنتها‬ ‫و‬ ‫الهواء‬ ‫سرعة‬ ‫إختبار‬
‫العالمية‬ ‫بالمقاييس‬
Measure Air Velocity &
Compare with Int. STD

18. Use Acoustic Liner Insulation from mouth
connection up to 1st Elbow with minimum
of 3 meters

19. FCU Noise-‫الداخلية‬ ‫الوحدة‬ ‫من‬ ‫اإلزعاج‬
Step-3:
Register 3-5 meters
from Return Air Grill to
register Noise Level
from Indoor FCU
and/or air sucking side.
‫الخطوة‬-2:
‫من‬ ‫بعد‬ ‫على‬ ‫التسجيل‬3-5
‫الراجع‬ ‫فتحة‬ ‫عن‬ ‫أمتار‬
‫الهو‬ ‫صوت‬ ‫مستوى‬ ‫لقياس‬‫اء‬
‫الداخلية‬ ‫الوحدة‬ ‫من‬ ‫الصادر‬
‫و‬/‫الراجع‬ ‫شفط‬ ‫عملية‬ ‫من‬ ‫أو‬
We advice when installing:
Indoor FCU avoid Return Grill and
keep maximum volume around
the intake to ease sucking.
‫بـ‬ ‫التركيب‬ ‫عند‬ ‫ينصح‬:
‫ج‬ ‫قريبا‬ ‫الداخلية‬ ‫الوحدة‬ ‫تركيب‬ ‫عدم‬‫دا‬
‫الراجع‬ ‫فتحة‬ ‫من‬,‫المحي‬ ‫الحجم‬ ‫زيادة‬ ‫و‬‫ط‬
‫الهواء‬ ‫رجوع‬ ‫لتسهيل‬ ‫بها‬.

20. Sample of Noise Level above the ceiling

21. Special noise absorber can
surround the unit to
reduce level from unit,

22. Plenum Box in the back of Indoor Unit will
reduce sucking noise of FCU.

23. Possible to fix special “S”-Type Plenum
to avoid direct Indoor Unit Noise
( ‫بشكل‬ ‫صندو‬ ‫تركيب‬ ‫و‬ ‫توريد‬S‫لتجميع‬ )
.‫الداخلية‬ ‫الوحدة‬ ‫صوت‬ ‫عزل‬ ‫و‬ ‫الراجع‬ ‫الهواء‬
Supply & Fix plenum box in
(S) Shape to collect return air
and isolate indoor unit.
‫صوت‬ ‫بعازل‬ ‫الداخل‬ ‫من‬ ‫يبطن‬ ‫أن‬ ‫على‬
‫الكفاءة‬ ‫على‬ ‫خا‬
Will be covered with special
acoustic liner that help to
reduce noise level

24. Noise level after reduction
Before - ‫قبل‬ After -‫بعد‬

25. Noise level after reduction
Before - ‫قبل‬ After -‫بعد‬

26. Noise level after reduction
Before - ‫قبل‬ After -‫بعد‬

27. ‫الصوت‬ ‫مستوى‬ ‫قياس‬ ‫أجهزة‬ ‫إستخدام‬
Instrument to Record Noise Level

28. Attenuators – Air Silencers- ‫الصوت‬ ‫خافضات‬

29. Attenuators – Air Silencers- ‫الصوت‬ ‫خافضات‬
‫النوعين‬ ‫أي‬
‫لماذا؟‬ ‫و‬ ‫أفضل؟‬
Which type is
better? & Why?
Air Direction
Air Direction

30. ‫الهواء‬ ‫مجرى‬ ‫مقطع‬ ‫من‬ ‫مخصومة‬ ‫مساحة‬60%‫؟؟؟‬
60% of Duct Section is Blocked???

31. No Change in Section ‫المقطع‬ ‫في‬ ‫تغيير‬ ‫ال‬

32. Air Direction
Air Direction
Air Direction
‫من‬ ‫أفضل‬ ‫المواضع‬ ‫أي‬‫مصدر‬‫ولماذا‬ ‫الصوت؟‬‫؟‬
Where to keep from noise source? Why?

33. Anther advantage of Controlling of Noise Level is to earn additional LEED Points (Leadership in Energy & Environmental Design)
Intent
To promote occupants’ comfort, well-being, and productivity by
improving indoor air quality.

34. Requirements
HVAC Background Noise
Achieve a maximum background noise level of 40 dBA
from heating, ventilating, and air-conditioning (HVAC)
systems in classrooms and other core learning spaces
.
Follow the recommended methodologies and best
practices for mechanical system noise control in ANSI
Standard S12.60–2010, Part 1, Annex A.1; the 2011
HVAC Applications ASHRAE Handbook, Chapter 48,
Noise and Vibration Control (with errata); AHRI
Standard 885–2008; or a local equivalent for projects
outside the U.S.
1EQ: Indoor Environmental Quality:
Prerequisite Minimum Acoustic Performance

35. Requirements
Exterior Noise
For high-noise sites (peak-hour Leq above 60 dBA during school hours),
implement acoustic treatment and other measures to minimize noise
intrusion from exterior sources and control sound transmission between
classrooms and other core learning spaces. Projects at least one-half
mile from any significant noise source (e.g., aircraft overflights,
highways, trains, industry) are exempt.
Reverberation Time
Adhere to the following reverberation time requirements.
Classrooms and Core Learning Spaces < 20,000 Cubic Feet
Design classrooms and other core learning spaces to include sufficient
sound-absorptive finishes for compliance with the reverberation time
requirements specified in ANSI Standard S12.60–2010, Part 1, Acoustical
Performance Criteria, Design Requirements and Guidelines for Schools,
or a local equivalent for projects outside the U.S.
1EQ: Indoor Environmental Quality:
Prerequisite Minimum Acoustic Performance (School)

36. Option 1
For each room, confirm that the total surface area of
acoustic wall panels, ceiling finishes, and other sound-
absorbent finishes equals or exceeds the total ceiling
area of the room (excluding lights, diffusers, and
grilles). Materials must have an NRC of 0.70 or higher
to be included in the calculation.
Option 2
Confirm through calculations described in ANSI
Standard S12.60-2010 that rooms are designed to
meet reverberation time requirements as specified in
that standard.
1EQ: Indoor Environmental Quality:
Prerequisite Minimum Acoustic Performance (School)

37. For Support Kindly contact: Eng. Juma Yousef
+962-7-9074-6811 (jumayjuma@gmail.com)
Green Earth Technology Co. Jordan -Getco– ‫األرض‬ ‫تكنولوجيا‬ ‫شركة‬‫الخضراء‬-‫األ‬‫ردن‬-‫جيتكو‬-
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jumayjuma@gmail.com