|
|
Ed Anderson wrote:
Sorry, Al, there was not any more to be had out of that document. I can understand that all angles of inclination may not be equal - in heat transfer or drag, but must admit I was surprised to find that 55deg supposedly provided 30% more heat transfer and 20% less drag than one perpendicular to the air flow. It would be interesting to find out the source of such a conclusion - I mean the graph looks like it comes from somewhere{:>)
The last sentence is interesting, and may be the key to their finding:
Due to the use of larger radiator, weight incensement finally eliminates the benefits gained by an inclined radiator...
So it appears that they have a set amount of room for a radiator. Set vertical, the rad is small doesn't cool well and the air is still moving fast so it makes a lot of drag. Lay it over, and you increase the frontal area and increase radiator volume. The air has expanded, thus moving slower, reducing drag.
We tend to start with a required amount of cooling, and let that lead us to how much radiator we need. We design that in, whatever it takes. This approach starts with a given volume, and looks to fill it with the most cooling possible.
--
http://www.ronpaultimeline.com
|
|