Heat from Breath, part 2

In the last post we considered heat lost through breathing and determined that breathing air at 35 °F results in a heat loss of about 2 Watts for every liter/min of air flow.  Of course, this depends strongly on the temperature and relative humidity of the ambient air.  In this post, we’ll consider both the effect of the condition of the ambient air, and also how much of the heat is latent (due to moisture) and how much is sensible (due to temperature).