Long-Term Assessment of a Set of CO2 Concentration Sensors in an In-Use Office Building

The measurement of the CO2 concentration has a wide range of applications. Traditionally, it has been used to assess air quality, with other applications linked to the experimental assessment of occupancy patterns and air renewal rates. More recently, the worldwide dissemination of COVID-19 establis...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2022-12, Vol.22 (23), p.9403
Main Authors: Lapuente, Carmen Serrano, Herrada, Héctor, Jiménez, María José, Sánchez, María Nuria
Format: Article
Language:English
Subjects:
Accuracy
Air pollution
Air quality
building energy
Building management systems
Buildings
Calibration
Carbon dioxide
Carbon dioxide concentration
CO2 concentration
Humidity
in situ measurements
Indoor air quality
Indoor environments
long-term measurements
Metabolism
Neural networks
Office buildings
performance gap
Quality assessment
Sensors
Severe acute respiratory syndrome coronavirus 2
Ventilation
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Summary:The measurement of the CO2 concentration has a wide range of applications. Traditionally, it has been used to assess air quality, with other applications linked to the experimental assessment of occupancy patterns and air renewal rates. More recently, the worldwide dissemination of COVID-19 establishing a relationship between infection risk and the mean CO2 level has abruptly led to the measurement of the CO2 concentration in order to limit the spread of this respiratory disease in the indoor environment. Therefore, the extensive application of this measurement outside of traditional air quality assessment requires an in-depth analysis of the suitability of these sensors for such modern applications. This paper discusses the performance of an array of commercial wall-mounted CO2 sensors, focusing on their application to obtain occupancy patterns and air renovation rates. This study is supported by several long-term test campaigns conducted in an in-use office building located in south-eastern Spain. The results show a spread of 19–101 ppm, with a drift of 28 ppm over 5 years, an offset of 2–301 ppm and fluctuations up to 80 ppm in instantaneous measurements not related to concentration changes. It is proposed that values averaged over 30 min, using a suitable reference value, be used to avoid erroneous results when calibration is not feasible.
ISSN:1424-8220
1424-8220
DOI:10.3390/s22239403