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A study on the effect of the airflow rate of the ceiling type air conditioner on the ventilation performance.

Author(s) : NOH K. C., HAN C. W., OH M. D.

Summary

The authors performed a study on the effect of the discharge airflow rate of the ceiling type air conditioner on the ventilation performance in the lecture room with the mixing ventilation. The experiments and CFD were conducted for analyzing ventilation performance. The concept of mean air age and indoor CO2 concentration were used for evaluating ventilation performance. The authors made the CO2 generation model in the simulation and calculated a lot of cases with respect to the airflow rate of air conditioner and the ventilation flow rate. And the selected experimental measurements were performed in the lecture room of the same layout as the numerical one for verifying simulation results. Mean air age is gradually increased, but CO2 concentration is oppositely decreased in the occupied zone with the increment of the discharge airflow rate of the ceiling type air conditioner. This result shows that both of mean air age and residual life time must be considered for evaluating ventilation performance when the contaminants are generated indoors. And the increment of discharge airflow of the ceiling type air conditioner can induce the piston effect and push the contaminants out of the occupied zone. From this result, it is found out that that ventilation performance can be increased when the momentum source like an air conditioner is used in the room with the mixing ventilation.

Details

  • Original title: A study on the effect of the airflow rate of the ceiling type air conditioner on the ventilation performance.
  • Record ID : 2008-2687
  • Languages: English
  • Source: Clima 2007. WellBeing Indoors. Proceedings of the 9th REHVA World Congress [CD-ROM + Abstract book].
  • Publication date: 2007/06/10

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