CO2 concentration and Stady-state mass balance model

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Presentation transcript:

CO2 concentration and Stady-state mass balance model Marianna Luoma 21.3.2017

Carbon dioxide CO2 is odourless gas Indicates contaminants from humans Outdoor air concentration 380-400 ppm Good air quality: when the concentration is less than 750 ppm D2: Concentration should not exceed 1200 ppm Higher levels of CO2 in indoor air indicate poor air quality and too low outdoor air flow per person

The need for ventilation to maintain air quality The CO2 production of a sitting person: qCO2 = 5,37 cm3/s (19,3 dm3/h) When the outside air concentration is 380 ppm and we do not want to exceed the indoor concentration of 1200 ppm, the air flow rate needed per person is: Qiv = qCO2 / ΔCCO2=(5,37 cm3/s/(1200-380) cm3/m3) = 6,5 dm3/s (compare to D2: 6 l/s, person)

CO2 concentration in steady state conditions Source: Demand Control Ventilation using CO2, ASHRAE Journal, 2001.

Demand Controlled Ventilation DCV Energy savings possible For example auditoriums CO2 sensor in the room Supply air flow rate is controlled according to the indoor air concentration The set value could be for example 750 ppm. MAMK D-building

TSI IAQ-Calc –mittarilla mitattu CO2-pitoisuus ja rakennusautomaation tallentama CO2-pitoisuus luokkahuoneessa

Steady-state mass balance model In the text book page 125

Air change rate n = q/V Unit: 1/h Example: n = 6,73 m3/h /37,9 m3 = 0,18 1/h

Nominal time constant Nominal time constant T = 1 / n Unit: h The concentration changes 63 % of the total change during 1 time constant. After a time corresponding to 4 nominal time constants, the indoor concentration will equal 98 % of the final, steady- state concentration.