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Hey Ed, Why Is Airflow Important?


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In this edition of "Hey Ed", Ed discusses why airflow is so important in Manual D

Hey Ed, why is the airflow important? Airflow and specifically the desired airflow is important so that we can get the capacity that we want out of our equipment. A good example of how airflow affects an air conditioner's capacity would be looking at the system's sensible heat ratio. When we have bigger airflow, and I define bigger airflow as something greater than 400 CFM per ton, we will have a higher sensible heat ratio which simply means that we’re going to end up with more sensible BTUs being removed versus late. If we have lower airflow, low airflow is defined as less than 400 CFM per ton, we’re going to see an increase in late removal, less sensible BTUs being removed. There are times where that lower airflow is desirable and there are times where the higher airflow is desirable but it should be a conscious decision we shouldn't just make things up and let it happen we should design for it and we should measure to confirm that we’re getting what we desire and that's the way I see it!

In this edition of “Hey Ed”, Ed discusses why airflow is so important in Manual D

Ed Janowiak is the Manager of HVAC Design Education at ACCA.


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Posted In: Hey Ed, Technical Tips

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