CFM Quantity for a 24' x 16' Office Area
CFM Quantity for a 24' x 16' Office Area
(OP)
Greetings!
Does anyone know how to calculate a CFM quantity for a 24' x 16' office area? There isn't any servers or extra heat load in the area, it is just people. Currently I have 1200-CFM serving this room and the users are still complaining about heat/cool airflow issues. Any guidance?
Does anyone know how to calculate a CFM quantity for a 24' x 16' office area? There isn't any servers or extra heat load in the area, it is just people. Currently I have 1200-CFM serving this room and the users are still complaining about heat/cool airflow issues. Any guidance?





RE: CFM Quantity for a 24' x 16' Office Area
RE: CFM Quantity for a 24' x 16' Office Area
RE: CFM Quantity for a 24' x 16' Office Area
RE: CFM Quantity for a 24' x 16' Office Area
RE: CFM Quantity for a 24' x 16' Office Area
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RE: CFM Quantity for a 24' x 16' Office Area
RE: CFM Quantity for a 24' x 16' Office Area
What exactly is the nature of their complaint?
Back in the day the rule of thumb was 15 cfm fresh air per person. If we guess that you have 20% fresh air in your 1200 cfm then that's enough for 16 people.
16 people in a 24 x 16 foot space is pretty dense.
RE: CFM Quantity for a 24' x 16' Office Area
You have over 3 cfm/ft2. Cut it down to 0.7 cfm/ft2. You might need to change your diffusers…
RE: CFM Quantity for a 24' x 16' Office Area
RE: CFM Quantity for a 24' x 16' Office Area
RE: CFM Quantity for a 24' x 16' Office Area
If you threw in 2.5kW per sqft for lighting, 500 BTUH per person, and 500 BTUH for each computer, you are still well below 3 CFM/sqft. The ventilation load is covered in the AHU. Bottom line, I don't think you really have 1,200 cfm of 55 deg air entering the space. You are either not getting that much air, or you have a reheat valve stuck open or something.
Now that I think about it, I have seen offices full of stock traders that are crammed together in small spaces. Each one has anywhere from 6 to 10 computer monitors on his desk. Is there some big heat load like that?
RE: CFM Quantity for a 24' x 16' Office Area
RE: CFM Quantity for a 24' x 16' Office Area
RE: CFM Quantity for a 24' x 16' Office Area
-- why do you think there is 1200 cfm going to the room; actual measurement, or numbers on plans?
-- constant or variable flow? if variable, where is the thermostat for the VAV?
-- have you personally visited the room to see what conditions are?