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Uncertainty Analysis of Interzonal Airflow Rates by Tracer Gas Methods

  • 한화택 (국민대학교 기계자동차공학부) ;
  • 조석효 (국민대학교 기계공학과 대학원)
  • Han, Hwa-Taik (School of Mechanical and Automotive Engineering, Kookmin University) ;
  • Cho, Seok-Hyo (Graduate School of Mechanical Engineering, Kookmin University)
  • 발행 : 2008.06.25

초록

Interzonal air movements are important to characterize overall ventilation performance of complicated multi-zone buildings. Tracer gas techniques are widely used to measure ventilation rates, ventilation effectiveness, and interzonal air movements. Depending on the number of gases used, they are divided into single and multi tracer gas methods. This paper deals with the comparison of the tracer gas methods in measuring air exchange rate between rooms. Experiments have been conducted in a simple two-room model with known airflow rates. In multi-gas procedure, the concentration decays of two tracer gases, i.e SF6 and R134a are measured after simultaneous injections in each room. The single tracer gas method is also applied by injecting SF6 gas with a time lag between two rooms. The data reduction procedures are developed to obtain the interzonal airflow rate using the matrix inversion, and various data manipulation methods are tested, such as data shift, interpolation, and smoothing. Uncertainty for each airflow rate is investigated depending on the parameters based on the setting values.

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