Experimental and Numerical Model Investigations of Oxygen-Enriched Characteristics in Air-Conditioned Rooms

Chuanzhao Zhang, Xiong Yang, Ziyi Li, Yingshu Liu, Yu Zhao, Haoyu Wang, Xiaojun Ma, Chunwang Li, Yuanhui Zhang

Research output: Contribution to journalArticlepeer-review


People who live and work in air-conditioned rooms with micro-hypoxia are prone to sick building syndrome (SBS). Enriching oxygen into an air-conditioned room to increase the oxygen concentration can improve indoor air quality (IAQ) and reduce ventilation to save building energy consumption. In the present paper, the number and diameter of the oxygen supply vents, the oxygen supply flow rate, the oxygen supply method and the air flow organization form were comparatively studied using a numerical model. The results were compared with the experiments results in un-air-conditioned rooms, which showed that this model can give a favorable prediction. The results show that the maximum axial velocity decreases with the increase of the axial distance under air-conditioned conditions. The relationship between the oxygen-enriched area and the oxygen flow rate is obtained by fitting. The diameter of the oxygen supply pipe is 0.006 m, and when oxygen supply methods 1# and 4# are adopted, the oxygen-enriched area is F = 0.4 + 0.383 Q and F = 0.237 + 0.8 Q, respectively.
Original languageEnglish (US)
Article number4733
JournalApplied Sciences (Switzerland)
Issue number11
StatePublished - Jun 1 2021


  • micro-hypoxia
  • oxygen supply vent
  • CFD
  • oxygen-enriched area
  • air-conditioned room
  • Oxygen supply vent
  • Air-conditioned room
  • Oxygen-enriched area
  • Micro-hypoxia

ASJC Scopus subject areas

  • General Engineering
  • Instrumentation
  • General Materials Science
  • Fluid Flow and Transfer Processes
  • Process Chemistry and Technology
  • Computer Science Applications


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