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I'm interested by your comment, but I can't figure out what you are intending to say. Why do you need to dilute CO2?

• eveningcoffee 9y ago
  Mostly because you do not want to die into CO2 poisoning when inside. :) Every building has some designed air change rate with the outside that will keep its habitants alive and comfortable. This can happen through so called natural ventilation or through controlled ventilation. As far I know, the common standard for the commercial buildings is 800 ppm (parts per million (1)) CO2 in the air. It is assumed that this level of CO2 would on average provide environment where people do not loose their productivity due to the air quality. This is what I mean by diluting - part of the CO2 rich air inside is replaced with the less CO2 rich air from the outside. Because habitants are producing CO2 with some rate, you have to replace the air with the rate that can keep up with this CO2 production rate. If the air outside has higher levels of CO2 then more of the replacement air is needed and the replacement rate must be higher to keep the projected inside CO2 levels. Replacing air faster will require more energy. Disclaimer: I am not a ventilation engineer, I just got interested of this topic during the home renovation. (1) Air contains about 21% of oxygen that is 210000 ppm of it. It follows that when the air feels "stuffy", it is not due to lack of oxygen but due to too much CO2 in it.
  • mtempm 9y ago
    Interesting. What would the benefit be of complicating something as simple as ventilation. However, 400000 to 410000 is a very small percentage incresse