Int. J. Metrol. Qual. Eng.
Volume 2, Number 2, 2011
|75 - 81
|10 January 2012
Indoor noise measurements evaluations for HVAC-Unit using inter-laboratory comparisons
Associate Professor of the Acoustic Laboratories in Building
Physics Research Institute at Housing and Building National Research Center,
HBRC, P.O. Box
2 Associate Professor, HVAC Consultant in Electro-Mechanical Research Institute at Housing and Building National Research Center, HBRC, P.O. Box 1770, Cairo, Egypt
Accepted: 24 November 2011
The international standard, ISO/IEC 17025 was developed to determine technical competence and to evaluate laboratories throughout the world. Accreditation bodies playing a vital role are increasingly using proficiency testing methodology as a tool to ensure the credibility of their accreditation programs. The successful completion of a well-designed proficiency test can validate the measurement method and uncertainty budgets of a testing laboratory. Additionally, proficiency tests can provide a good indication about the quality of the test results. An important part of inter-laboratory comparisons and proficiency testing is the determination of the associated error analyses which are focused on uncertainty values. This paper presents the implementation of proficiency tests using inter-laboratory methodology among five different acoustic laboratories. These tests were carried out on 5.27 KWCooling standard unitary air conditioner, A/C, such as 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 agreement for En-Value among the selected laboratories when compared with the lowest uncertainty as stated by proficiency tests standards.
Key words: Indoor sound measurements / noise level in dBA / air-conditioning unitary unit / proficiency testing / Uncertainty / ISO/IEC 17025 / ASTM 1574
© EDP Sciences 2012
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