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標準 | 國家 | 描述 |
SMACNA HVAC Air Duct Leakage Test manual, First edition, 2012 | US | Duct construction leakage classification, expected leakage rates for sealed and unsealed ductwork, duct leakage test procedures, recommendations on use of leakage testing, types of test apparatus and test setup and sample leakage analysis. |
法規內要求的計算公式如下：
Duct Class | 1/2-, 1-, 2-inwg | 3-inwg | 4-, 6-, 10-inwg |
Seal Class | C | B | A |
Sealing Applicable | Transverse Joints Only | Transverse Joints and Seams | Joints, Seams and All Wall Penetrations |
Leakage Class | |||
Rectangular Metal | 16 | 8 | 4 |
Round Metal | 8 | 4 | 2 |
Maximum air leakage is then defined as
F=CLP0.65
F = Maximum air leakage (cfm/100 ft2)
CL = Leakage class
P = Pressure (inwg)
以美國標準為例，測試時由客戶提出密封等級(Seal Class)和測試壓力P，
根據SMACNA標準確定Leakage Class CL，根據公式 F=CLP0.65 計算出最大泄漏率Fmax
為方便計算，提供如下測算表：
Allowable Leakage Factor (CFM/100 sq ft) | |||||||||||
Static pressure | 0 | 1 | 2 | 3 | 4 | 6 | 7 | 8 | 9 | 10 | |
CL | 1 | 0.0000 | 1.0000 | 1.5692 | 2.0423 | 2.4623 | 3.2048 | 3.5425 | 3.8637 | 4.1712 | 4.4668 |
2 | 0.0000 | 2.0000 | 3.1383 | 4.0847 | 4.9246 | 6.4096 | 7.0851 | 7.7275 | 8.3423 | 8.9337 | |
3 | 0.0000 | 3.0000 | 4.7075 | 6.1270 | 7.3869 | 9.6143 | 10.6276 | 11.5912 | 12.5135 | 13.4005 | |
4 | 0.0000 | 4.0000 | 6.2767 | 8.1694 | 9.8492 | 12.8191 | 14.1701 | 15.4550 | 16.6847 | 17.8673 | |
6 | 0.0000 | 6.0000 | 9.4150 | 12.2541 | 14.7737 | 19.2287 | 21.2552 | 23.1825 | 25.0270 | 26.8010 | |
8 | 0.0000 | 8.0000 | 12.5533 | 16.3387 | 19.6983 | 25.6382 | 28.3403 | 30.9100 | 33.3693 | 35.7347 | |
12 | 0.0000 | 12.0000 | 18.8300 | 24.5081 | 29.5475 | 38.4574 | 42.5104 | 46.3649 | 50.0540 | 53.6020 | |
16 | 0.0000 | 16.0000 | 25.1067 | 32.6775 | 39.3966 | 51.2765 | 56.6805 | 61.8199 | 66.7387 | 71.4694 | |
24 | 0.0000 | 24.0000 | 37.6600 | 49.0162 | 59.0949 | 76.9147 | 85.0208 | 92.7299 | 100.1080 | 107.2041 | |
舉例如下：
Static pressure ： 6
CL ：6
則F = 19.2287 即最大限值Fmax
QL—泄漏風量值(cfm)
Area—被測管道的表面積(ft2)
F<Fmax則被測管道合格
GTI 管道漏風量測試機型號DALT6900，DALT6910儀器內置以上標準，無需計算，可以直接輸出判定結果，操作簡單方便！
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