HJ 2523-2012 (HJ2523-2012)

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HJ 2523-2012	English	239	Add to Cart	3 days [Need to translate]	Technical requirement for environmental protection product. Silencers for ventilation	HJ 2523-2012	Valid	HJ 2523-2012

HJ 2523-2012
Technical requirement for environmental protection product.Silencers for ventilation
People's Republic of China National Environmental Protection Standards
Replacing HJ/T 16-1996
Environmental protection product ventilation muffler
Technical requirement for environmental protection product
Silencers for ventilation
2012-7-31 release
2012-11-1 implementation
Issued by the Ministry of Environmental Protection
Table of Contents
Preface ..II
1. Scope .1
2 Normative references .1
3 Terms and definitions ..1
4. Technical Requirements .2
5 .2 Test Method
6 .3 inspection rules
7 logo .. 3
Appendix A (informative) muffler inspection record format 4
Foreword
To implement the "People's Republic of China Environmental Noise Pollution Prevention Law," to improve the level of product quality ventilation silencers, ventilation silencers guide
Product development and production, the development of this standard.
This standard specifies the ventilation muffler technical performance indicators, test methods and inspection rules.
This standard is the "ventilation mufflers" (HJ/T 16-1996) amendments to the standard compared with the original main modifications are as follows.
- Acoustic Performance Evaluation octave band insertion loss to the arithmetic mean;
- Product range increased micro-perforated plate muffler, muffler HIP me, cellular muffler, canceled the disc muffler;
- Modify the standard limits, and the scope, normative references, technical requirements, test methods have been modified;
- An increase of terms and definitions, inspection rules, signs.
This standard was first published in 1996.
From the date of implementation of this standard, "Ventilation muffler" (HJ/T 16-1996) abolished.
This standard is developed by the Ministry of Environmental Protection Science, Technology organization.
This standard was drafted. China Environmental Protection Industry Association (Noise and Vibration Control Committee), Beijing Labor Protection Science Research Institute,
Shenzhen Ya Electrical and Mechanical Industry Co., Ltd., Institute of Building Physics China Academy of Building Research, Beijing Chong green acoustic engineering Co., Ltd.,
Shanghai Environmental Protection Engineering Co., Xinhua net.
This standard MEP July 31, 2012 for approval.
This standard since November 1, 2012 implementation.
The standard explanation by the Ministry of Environmental Protection.
Environmental protection product ventilation muffler
1 Scope
This standard specifies the technical requirements for ventilation muffler, test methods and inspection rules.
This standard applies to mufflers ventilation and air conditioning engineering supporting the use of.
2 Normative references
The standard content of the following documents cited in the articles. For undated references, the effective version applies to this standard.
GB/T 4760 Methods of measurement of acoustic muffler
GB/T 20431 acoustic muffler noise control guidelines
GB 50243 Construction Quality Acceptance of Ventilation and Air Conditioning Engineering
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1 ventilation muffler
Ventilation and air conditioning projects supporting the use of mufflers.
3.2 Insertion Loss
Muffler device compared with previous devices after muffler to reduce the amount of sound power level radiated noise nozzle. Decibels (dB).
3.3 Total pressure loss
ΔPt
Full pressure muffler between upstream and downstream. Unit Pascal (Pa).
3.4 drag coefficient
The average ratio of dynamic pressure and total pressure loss muffler upstream flanged cross section at.
2 '⎟⎠
⎞⎜⎝
⎛Δ =
tζ (1)
Where.
vP - according to internal test pipe GB/T 4760 to calculate the average flow dynamic pressure, the unit is Pascal (Pa);
S - cross-sectional area of the test tube, in square meters (m2);
'S - muffler upstream flanged sectional area, in square meters (m2).
3.5 octave band insertion loss arithmetic mean
OCTD
At the center frequency of 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz,