And, let's keep in mind that the density loss with increasing humidity is very minor. Raising relative humidity from 20% to 80% (at 90 degrees F) has about the same effect on density as an elevation change of 125 feet. There is a nifty density calculator at: http://www.nightrider.com/biketech/calc_airdensity.htm It is designed to help with motorcycle jetting. Bill ----- Original Message ----- From: "Keith Hughes" <keithahughes@QWEST.NET> > From this it can clearly be seen that as the water content (truly > gaseous water) increases, the enthalpy of the resulting mixture > increases. That is, it contains (or can contain) a greater amount > of heat. So, *for any given pressure*, the higher the humidity, the > higher the heat transfer capacity will be. However, as has been > said, the higher the humidity, the less dense the air. So, there > are a couple of competing things happening here; > > 1. As the humidity increases, the enthalpy, and heat transfer > efficiency, increases for any given pressure. > > 2. As the humidity increases, the density (and hence pressure) > decreases. |
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