Fresh Air CFM, ASHRAE 62.2 Ventilation Rate, Example
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- Опубликовано: 21 ноя 2024
- In this video we show a practical example on how to calculate analytically ventilation CFM for a house. As we saw in other videos, the software calculates these values when we input number of bedrooms and area of a house. In case of commercial design, we resort to an excel table to obtain the cfm required for each space. In the video we also show examples when designers usually use intermittent or continuous ventilation, depending on the application.
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Great video! 👍 Keep it up!
Thanks for your kind comment!
Great job, could you please share the link for ASHRAE 62.2
I can see that latest is in this link. Hope this helps.
static1.squarespace.com/static/6320b844c3820725e4d5688f/t/6372af076022e56f815dc7f5/1668460297956/ASHRAE+62.1-2022+%281%29.pdf
What about the ACH equation when we use it ? I see a lot of engineers use the ACH equation for ventilation and exhaust
Great question. IMC mainly uses 0.35 ACH but no less than 15 fm/person. This mainly depends on the designer. Particularly when designing multifamily projects I see we have two options. Whether to use ASHRAE 62.2-2013 or IMC-2015 (Washington DC for example)
ASHRAE 62.2-2013 = 68 cfm
IMC-2015 = 48 cfm
In this case, I personally use the worst case scenario which is 68 cfm (ASHRAE 62.2-2013)
Also, it is important to keep in mind that the more Outside you put in a house or commercial building, the more expensive the project becomes.
What are these rates based off of? i.e. 0.03 for residential townhomes and 7.5 for light-moderate work?
Very good question. The first one is the Area Ventilation Rate which is 3 cfm/100 SF (ASHRAE 62.2 2013). This rate is based on calculation methods from ASHRAE 62.2.
The second one is the Occupancy Rate. this is represent and account the number of occupants and the number itself might be a factor to determine the ventilation due to people.