CO2 Indoor Air Quality Solutions
The Facts
When breathing in, a human absorbs oxygen (o2) from the air and releases carbon dioxide (co2), water and volatile organic olfactory substances into the air when exhaling. The air inhaled contains 21% by volume oxygen (o2) and 0.035% by volume carbon dioxide (co2), the air exhaled contains 16% by volume oxygen (o2) and 4% by volume carbon dioxide (co2). Thus, in interior rooms that are not ventilated, the carbon dioxide (co2) content rises continuously depending on the number of people in the room, where as the oxygen content barely changes.
In a fully occupied and insufficiently ventilated room, the carbon dioxide (co2) concentration rises from 0.035% to 0.14% by volume, however the oxygen concentration drops only from 21.0 to 20.9% by volume.
The Problem
Although Carbon Dioxide (co2) is toxic for humans only from a concentration pf 2.5% by volume, it does affect a persons well being and fitness at a much earlier time:
Carbon dioxide (co2) causes tiredness starting from a concentration of 800 ppm (0.08% by volume). The maximum limit of carbon dioxide in schools should not exceed 1000ppm and in order to ensure the continuous observance of this limit value, the standard DIN 1946-6 requires an outside air volume flow of 30m³/h per person to maintain indoor air quality. DIN 1946-6 defines 1500ppm carbon dioxide (co2) as the hygienic indoor quality guidance value for interior rooms.
In view of today's building standards and the high impermeability of building walls, this value cannot be reached by occassional airing or tipping of windows, neither in conference rooms nor in low energy houses. Constant ventilation by means of open windows increases energy consumption, the ensuring draft results in colds and is considered unpleasant.
The Solution
In order to maintain indoor air quality (IAQ), demand controlled ventilation (DVC) is needed in such rooms and buildings, and this is possible with the carbon dioxide monitors offered by SST.
The infrared carbon dioxide indoor air quality monitor AQ-Transmit determines the concentration of carbon dioxide (co2) in the room air and supplies this value - either via an intermediate limit monitor or directly to a ventilation system, which controls the supply of fresh air as needed.
This saves energy, decreases cost and increases the well being of all persons present.
Carbon Dioxide (co2) is considered the leading substance for the pollutants that can lead to "sick building syndrome". It is assumed that the occurence of these symptoms can be reduced by 70 to 85% through increased air-conditioning, controlled indoor air quality through the use of CO2 air quality monitors.
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