Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study on the Optimal Orifice Location for Air flow Measurement in an Air Duct Leakage Tester

덕트누기시험기용 풍량측정 오리피스의 최적위치 선정에 관한 연구

  • Lee Seung-Chul (School of Fire & Disaster Prevention, Samcheok National University)
  • 이승철 (삼척대학교 소방방재학부)
  • Published : 2006.02.01
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Abstract

In this study, five experiments were carried out, with an orifice located downstream of a fan in case I where upstream duct length is 6 D, and that in the downstream is 4 D and different downstream distance to the fan in the rest, so as to determine the optimal location of the orifice and reduce the duct length of airflow measurement device. The resulting flow rate-pressure drop correlations were found to satisfy the limitation of SMACNA standard, which specified an error of $\pm7.5\%$ based on the real flow rate. Also, the best one of five. cases was achieved with the orifice located midway of the orifice duct four times its diameter long.

Keywords

References

  1. Sheet Metal and Air Conditioning Contractors National Association, Inc., 1985, HVAC Air Duct Leakage Test Manual, SMACNA
  2. Korean Association of Air Conditioning Refrigeration and Sanitary Engineers, 1999, KARSE B 0016-Test Code for Leakage of HV AC Air Duct, KARSE
  3. Korea Standard Associations, 2001, KS F 2282-Method of Test for Leakage of Equipment Units for Dwellings, KSA, Korea
  4. AMCA Publication, 1990, Fans and Systems, AMCA, Illinois, USA
  5. Korea Standard Associations, 1997, KS A 0612-Measurement of Fluid Flow by Means of Orifice Plates, Nozzles and Venturi Tubes inserted in Circular Cross-section Conduits Running Full, KSA, Korea
  6. American Conference of Governmental Industrial Hygienists, 1976, Industrial Ventilation-Testing of Ventilation Systems, ACGlH, Lansing, MI
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