Skeggy wrote:

I thought of using a 16" desk fan, but I couldn't fit it under the radiatio
:-). Hadn't thought of a model plane propellor though.

It occurred to me that PC case fans normally operate in 'pull' mode, drawing
air from the case. When you run your hand over one in operation the blow is
quite spread out (about 45 degr). I even tought about having the fan rack at
the top of the radiator to pull hot air from the top - but not for long!.
The PC fans aren't perfect but in he end you do get a breeze, if I can find
something better then good!.

Indicentally both the 1000 and 2500 rpm fans are rated at 1.4W, funny
enough.

Skeggy.

Last time I did this trick, a single 4" fan added about 3C to the room.
If you're looking for fast warmup then you're after greatly increased
output instead of a bit of increase. A deskfan would be nearer the
mark. It would be blowing air across the front of the rad rather than
behind. Standard rads are far from ideal for high fanned output, and
the more you push them the less ideal they behave. However you can stll
boost them a fair amount if needed. For a desk fan you can either point
it at the front or at the side, where it would cause airflow back and
front.

Shelf over top of rad works well at directing airflow, preventing hot
air all gathering up near the ceiling.

Are you housing your small pc fans? If not, much of the air goes out
one side of the fan and back in the other.

Is this for a normally off but we want to be able to heat it up quickly
room?


NT