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Numerical prediction of the age of air in ventilated rooms.

Author(s) : GAN G., AWBI H. B.

Summary

The local mean age of air is defined as the average time for air to travel from a supply outlet to any point in a room. Since the introduction of the term for room ventilation it has been used as one of the measures for assessing ventilation efficiency. There are three tracer gas methods to determine the age of air: pulse method, step-up method and decay method. Numerical method has recently been used to predict the age of air in rooms by a number of researchers. There are also three methods available for predicting the age of air, namely, transient method, steady state method and particle marker method. In the paper, the steady state method is therefore used to predict the local mean age of air in rooms. The comparison between numerical prediction and experimental measurement is first presented. The method is then used to evaluate the ventilation efficiency for a variety of air distribution systems.

Details

  • Original title: Numerical prediction of the age of air in ventilated rooms.
  • Record ID : 1995-1736
  • Languages: English
  • Source: ROOMVENT '94. Air distribution in rooms. Proceedings.
  • Publication date: 1994/06/15
  • Document available for consultation in the library of the IIR headquarters only.

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