I Ceiling fan pressure increase or decrease

[singhsshub]

Would air pressure increase or decrease due to a ceiling fan in a room?

 

[Arjan82]

Neither, this is internal flow. The pressure directly around the fan will decrease (before the fan) and increase (after the fan) somewhat, this pressure smears out to miniscule amounts in other parts of the room. But on average the pressure stays the same.

Also, the room is usually connected to the exterior atmosphere, which equalizes the pressure.

 

[Baluncore]

Would air pressure increase or decrease due to a ceiling fan in a room?

If the room was a hermetically sealed box, with an internal fan, then the internal air would be warmed by the turbulence generated by the fan. The warmer air would expand, so pressure would increase.

 

[Arjan82]

Not just hermetically sealed, but also perfectly insulated, but yeah, nicely found :)

 

[DaveC426913]

Not just hermetically sealed, but also perfectly insulated, but yeah, nicely found :)

It wouldn't need to be perfectly insulated. Certainly that would maximize the effect, but a regular closed room could still be heated sufficiently to cause the expansion effect temporarily. Lots of typical home appliances can produce sufficient heat to raise the temp of a closed room noticeably.