It may also be found at
www.arcwear.com. It is “Duke Power's Heat Flux Calculator;” a crude non-graphical application, but illustrates the point.
The listed URL is maintained by Hugh Hoagland, who has been extensively involved in related standards authoring/consulting and PPE testing for awhile now. He may be able to confirm the factors for single-phase situations.
[This message has been edited by Bjarney (edited 01-05-2003).]