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Using carbon dioxide measurements to determine occupancy for ventilation controls.

Author(s) : KE Y. P., MUMMA S. A.

Summary

The paper proposes a new method to determine the dynamic zonal occupancy for ventilation control based upon measured carbon dioxide (CO2) concentrations in the supply and return air. The central thesis of this proposed transient method is that a fixed CO2 threshold based upon occupancy alone is not possible under the current proposed BSR/ASHRAE Standard 62-1989R. Rather, the actual dynamic occupancy head count must be known since the ventilation requirements consist of two parts - the building component and the occupancy component. The result is that the CO2 threshold must constantly be changed in time with occupancy. The paper employs simulation results for well-mixed office and conference rooms as the basis for comparison of the proposed transient occupancy-based ventilation with two other accepted methods: the CO2-based ventilation and the constant airflow ventilation.

Details

  • Original title: Using carbon dioxide measurements to determine occupancy for ventilation controls.
  • Record ID : 1999-0450
  • Languages: English
  • Source: ASHRAE Transactions.1997 Annual Meeting, Boston, MA.
  • Publication date: 1997
  • Document available for consultation in the library of the IIR headquarters only.

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