一、法規(guī)概述

標(biāo)準(zhǔn)	國(guó)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.

 

二、法規(guī)詳情

法規(guī)內(nèi)要求的計(jì)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=C_LP^0.65 
F = Maximum air leakage (cfm/100 ft²)
C_L = Leakage class
P = Pressure (inwg)

三、細(xì)則分析

1)法規(guī)要求下的最大限值Fmax

以美國(guó)標(biāo)準(zhǔn)為例，測(cè)試時(shí)由客戶提出密封等級(jí)(Seal Class)和測(cè)試壓力P，
根據(jù)SMACNA標(biāo)準(zhǔn)確定Leakage Class C_L，根據(jù)公式 F=C_LP^0.65  計(jì)算出最大泄漏率Fmax
為方便計(jì)算，提供如下測(cè)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

2)實(shí)測(cè)管道的測(cè)試值F

3）判定

 
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