Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-10T20:58:58.615Z Has data issue: false hasContentIssue false
  • English
  • Français

Indoor noise measurements evaluations for HVAC-Unit usinginter-laboratory comparisons

Published online by Cambridge University Press:  10 January 2012

H. S. Seddeq  and
A.A. Medhat A. Fahim
H. S. Seddeq*
Affiliation:
Associate Professor of the Acoustic Laboratories in Building Physics Research Institute at Housing and Building National Research Center, HBRC, P.O. Box 1770, Cairo, Egypt
A.A. Medhat A. Fahim
Affiliation:
Associate Professor, HVAC Consultant in Electro-Mechanical Research Institute at Housing and Building National Research Center, HBRC, P.O. Box 1770, Cairo, Egypt
*
⋆Correspondence:hodasoliman@yahoo.com
Get access

Abstract

The international standard, ISO/IEC 17025 was developed to determine technical competenceand to evaluate laboratories throughout the world. Accreditation bodies playing a vitalrole are increasingly using proficiency testing methodology as a tool to ensure thecredibility of their accreditation programs. The successful completion of a well-designedproficiency test can validate the measurement method and uncertainty budgets of a testinglaboratory. Additionally, proficiency tests can provide a good indication about thequality of the test results. An important part of inter-laboratory comparisons andproficiency testing is the determination of the associated error analyses which arefocused on uncertainty values. This paper presents the implementation of proficiency testsusing inter-laboratory methodology among five different acoustic laboratories. These testswere carried out on 5.27 KWCooling standard unitary air conditioner, A/C, suchas through-wall or split room standard A/C units, for the assessment of Housing &Building National Centre acoustic laboratory. Analyses of results show a good agreementfor En-Value among the selected laboratorieswhen compared with the lowest uncertainty as stated by proficiency tests standards.

Keywords

Indoor sound measurementsnoise level in dBAair-conditioning unitary unitproficiency testingUncertaintyISO/IEC 17025ASTM 1574
Type
Research Article
Information
International Journal of Metrology and Quality Engineering , Volume 2 , Issue 2 , 2011 , pp. 75 - 81
Copyright
© EDP Sciences 2012

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

ISO/IEC 17025, International Organization for Standardization, General requirements for the competence of testing and calibration laboratories, 2nd edn., (2005)
BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML, Guide to the expression of uncertainty in measurement, International Organization for Standardization (Geneva, 1993)
S. Sartori, Estimation of measurement uncertainty – considerable example, HMD 18th Metrology Symposium (Cavtat, Croatia, 2001)
Dr. H.S. Nielsen, Determining Consensus Values in Interlaboratory Comparisons and Proficiency Testing, NCSL International Workshop and Symposium (2003)
ISO/IEC, Conformity assessment – General requirements for proficiency testing (2010)
ISO 5725-6, International Organization for Standardization, Accuracy (trueness and precision) of measurement methods and results – Part 6: Use in practice of accuracy values (1994)
ASTM E 1574, American Society for Testing and Materials, Standard Test Method for Measurement of Sound in Residential Spaces, 98 (2006)
ASHRAE, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Recommended Procedure for Measuring the HVAC System – Induced Noise in a Room (Draft #10) (2007) www.enoisecontrol.com
ASHRAE, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Fundamentals Handbook (SI) (1997), Chap. 7
R. Payne, Uncertainties associated with the use of a sound level meter, NPL Report DQL-AC 002, 2004
ASTM E90-04, Standard test method for laboratory measurement of airborne sound transmission loss of building partition and elements
EUROLAB, European Federation of National Associations of Measurement. Testing and Analytical Laboratories, Measurement Uncertainty in testing, Technical Report 1/2002, 2002