HVAC Internal Duct Airflow Speed
HVAC Internal Duct Airflow Speed
(OP)
Does anyone out there know the mean and distribution of airflow velocities internally in an airconditioning and heating duct. I've been told it varies from 0 - 25 m/s, but would like to find out more for some design calculations.





RE: HVAC Internal Duct Airflow Speed
http://www.roofunitsltd.co.uk/sharing/system.pdf
RE: HVAC Internal Duct Airflow Speed
RE: HVAC Internal Duct Airflow Speed
My main wish is not to trivialize the things by just saying 'x' fpm in main duct, 'y'fpm in branch and 'z'fpm at girlls.
Generally main duct velocity is from 1500 - 2500fpm and in branches it is 800 - 1500 fpm and at supply grills it is 400 - 600 fpm.From these ranges how will you come to a single value? (that is by knowing the design philosophy).
That link I have provided gives comprehensive (and free) data.
25m/s is quite high velocity. Even in high fume generation applications (welding shops and foundaries etc.)it is maintained at 15m/s.
Regards,
RE: HVAC Internal Duct Airflow Speed
RE: HVAC Internal Duct Airflow Speed
RE: HVAC Internal Duct Airflow Speed
That then begs the question - is HVAC a science or is it merely the application of a science??!!
Answers on a postcard ......
RE: HVAC Internal Duct Airflow Speed
RE: HVAC Internal Duct Airflow Speed