CO2… what’s it all about

In 2011 Rotronic expanded its range of measurement parameters to include Carbon Dioxide gas measurements and now provides a range of transmitters, loggers, large panel displays and handhelds.

CO2 is becoming an increasing important gas to monitor and control for several reasons. This post will explore some of the science, applications and future trends for this ubiquitous gas…

CO2 and Human Health

CO2 can seriously effect human health. Figure 1 shows this relationship and the possible implications.

Effects of CO2Figure 1 – CO2 levels 

Fresh air typically has around 350-450 ppm CO2 however in exhaled air levels increase to around 38,000 – 50,000ppm! Metabolism and exercise can increase the rate of CO2 production.

In the UK we typically have poorly ventilated buildings in addition with increasing drives for energy efficiency, buildings are becoming more air tight and if not managed carefully air change rates can be further reduced.  To demonstrate how quickly CO2 can rise through poor ventilation Figure 2 shows a log of CO2, Temperature and Humidity overnight in my bedroom! You can see levels quickly increase to >2400ppm. The rapid drop is due to an opened window

CO2 record
Figure 2 – CO2 levels overnight (CO2 in ppm)

 

This direct relationship between CO2 and human occupation is a useful tool. It allows building management systems to control ventilation rates precisely to the levels required based on occupation rates. This can significantly reduce energy usage especially with the incorporation of variable speed fans.

Recent projects at Google’s Irish Headquarters and the Apple offices in Cork have used these principles to save energy and improve working conditions for their staff and achieve additional LEED points.

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Regulations are increasing for CO2 monitoring. Areas of interest especially we are seeing include Schools, Catering Areas and Car Parks.

If you have any queries relating to CO2 let us know!

Dr. Jeremy Wingate
Rotronic UK

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