Use Case

Akenza CO2 Level Monitoring in Schools & Workplaces

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1/2 Akenza Factsheet – CO 2 monitoring use case CO 2 level monitoring in schools and workplaces Usually, people start experiencing some physical efects at 900 ppm. Yet it is not rare to measure levels higher than 1000 ppm in public schools. The Swiss Federal Ofi ce of Public Health conducted a representative survey between 2013 and 2015 to fi nd out how well schools in Switzerland are ventilat- ed. To assess the air exchange rate, CO 2 concentrations were measured continuously over four days in 100 classrooms. The study showed that in two-thirds of the classrooms, the pro- portion of hygienically unacceptable air values, i.e. CO 2 levels above 2000 ppm, was more than 10% of the total teaching time. Moreover, in 30% of the classrooms, at least 30% of the total teaching time was in the range of unacceptable indoor air quality. Leveraging IoT to improve the students and employees wellbeing To tackle this problem, companies need to be able to mea- sure the air quality on their premises and take actions based on the collected data. It is such projects that Akenza accom- panies together with facility managers and schools. Our IoT sotware infrastructure enables our partners to devel- op their IoT solutions with a simplifi ed path from hardware to end-user applications. In the current case, schools and ofi ces install fi rst their LoRaWAN-based CO 2 sensors such as the DL-IAM from Decentlab (fi g.1a) or ERS CO 2 from Elsys (fi g.1b). Thanks to integrations to leading connectivity providers (Actility, Loriot, TTN, Sigfox, Ericsson CMP), registering a new device on the plaform can be done in minutes, everything is automated in the background. The Akenza Core reads the sensors' data, processes it, and triggers specifi c actions based on the collected data enabling countless use cases. The case of Zürich In 2019, the city of Zürich with the help of Akenza installed more than 50 LoRaWAN-based indoor climate sensors, most of them in classrooms, some in retirement homes, and other public buildings, see fi g.2a and fi g. 2.b. In this study, it was shown in many classrooms, that the concentration of CO 2 increases relatively quickly during class time. The highest measured value over the last months was over 3500ppm and thus clearly in the unacceptable range. However, the collection of the data is only one part of the solution. Custom notifi cations and visual feedbacks for the teachers are needed when the threshold value is exceeded. Making sense of the data The fi rst level of control is to be able to log and visualise the CO 2 levels either on dedicated visualisation tools such as Grafana, Power BI, and Tableau or on custom web applications thanks to the REST API interface. Additionally, the Akenza Core Rule Engine allows to monitor the CO 2 levels continuously and react automatically when a fi g.1b Elsys ERS CO fi g.1a Decentlab Indoor Ambiance Monitor (IAM) According to recent studies, the level of carbon dioxide in indoor spaces can directly affect people's wellbeing and performance. Indeed, poor air quality due to high levels of CO2 is linked to detrimental cognitive effects such as poor decision making, lack of focus, and drowsiness.

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