Influence of mechanical ventilation system on indoor carbon dioxide and particulate matter concentration

Conson K.H. Yu, Min Li, Vincent Chan, Alvin C.K. Lai

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


Common ventilation strategies may fail to maintain indoor air quality when atmosphere is heavily polluted by particulate matter. This paper evaluates the performances of common constant air volume (CAV) system and variable air volume (VAV) system when carbon dioxide and particles are significantly present in outdoor environment. Major system parameters including filter efficiency, occupancy number, ventilation air rate, and outdoor particle concentration are thoroughly examined. Firstly, a full-scale chamber experiment is performed to investigate the dynamics of CO2 and airborne particles under steady and non-steady scenarios. The result is further validated with a previously-developed state-space model. Secondly, an exhaustive case study is conducted using an established mathematical model. In order to reduce CO2 concentration, both CAV and CO2-based demand-controlled VAV may cause an undesirable increase in particle concentration when outdoor air is heavily polluted by particles. This dilemma requires further studies on the optimization of ventilation schemes.

Original languageBritish English
Pages (from-to)73-80
Number of pages8
JournalBuilding and Environment
StatePublished - Jun 2014


  • IAQ
  • Particulate matter
  • State-space model
  • Ventilation


Dive into the research topics of 'Influence of mechanical ventilation system on indoor carbon dioxide and particulate matter concentration'. Together they form a unique fingerprint.

Cite this