S&W, here is a table that may be of help to you.
Interesting to see the effect of air in the system. Convection transfer rises to about 40% of the total energy at a peak temp of 150-200ºF, then drops as the temp of the radiating surface rises beyond that. In a vacuum, all of the heat would be transferred by radiation alone.
Here are a few charts that show the same info, plus some other interesting stuff.
http://www.engineeringtoolbox.com/radiation-heat-transfer-d_431.html
Interesting to see the effect of air in the system. Convection transfer rises to about 40% of the total energy at a peak temp of 150-200ºF, then drops as the temp of the radiating surface rises beyond that. In a vacuum, all of the heat would be transferred by radiation alone.
Here are a few charts that show the same info, plus some other interesting stuff.
http://www.engineeringtoolbox.com/radiation-heat-transfer-d_431.html