A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of mechanical ventilation system on indoor carbon dioxide and particulate matter concentration
Abstract 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.
Highlights This work validated a state-space model under steady and transient conditions. The model was used to quantify the dynamic relationship between CO2 and PM level. Low grade filter, high ventilation and polluted air may lead to high PM, low CO2. PM level could be higher than WHO recommendation. This dilemma requires optimization of ventilation schemes.
Influence of mechanical ventilation system on indoor carbon dioxide and particulate matter concentration
Abstract 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.
Highlights This work validated a state-space model under steady and transient conditions. The model was used to quantify the dynamic relationship between CO2 and PM level. Low grade filter, high ventilation and polluted air may lead to high PM, low CO2. PM level could be higher than WHO recommendation. This dilemma requires optimization of ventilation schemes.
Influence of mechanical ventilation system on indoor carbon dioxide and particulate matter concentration
Yu, Conson K.H. (author) / Li, Min (author) / Chan, Vincent (author) / Lai, Alvin C.K. (author)
Building and Environment ; 76 ; 73-80
2014-03-03
8 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2014
Carbon Dioxide Concentration-Based Ventilation Control
| British Library Online Contents | 1993