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Don't forget that air at a constant 104F 80% RH will have a dew point temperature of 97F.

If you don't need to reinvent the wheel, I'd recommend Heat Pipes: Theory, Design and Applications by Reay & Kew.

A quick hand calc gives a required plate temperature of -14 deg.C (assuming both plate and item have high emittances ~0.9). If you want to use a cooling system you will need a larger Al plate for water or a more exotic coolant. Alternatively you could look at a conductive solution such as...

Try Kercher's correlation. If you can't find it on the net let me know and I'll look for it in my old General Electic Heat Transfer Data Book.

You are more likely to find the material properties that make up thermal diffusivity. Look for thermal conductivity (k), density (rho) and specific heat capacity (Cp) of the material as a function of temperature. Diffusivity = k/(rho*Cp).