Considerations About Humidity 2: Solar Cooling
Categories: [ Science ]
When wrapping an object (e.g., a beer bottle) in a wet cloth and leaving it to
dry, the bottle will be cooled down due to the evaporation of the water. The
chart on the left gives the theoretical temperature that the bottle is
supposed to reach depending on the temperature of the air and the relative
humidity. It does not take into account direct exposure to the heat of the
sun (which increases the temperature), nor the wind (which probably affects
only the speed at which the cooling occurs, not the final temperature).
The formula used gives the wet bulb temperature based on the dry bulb temperature (i.e., the temperature of the air) and the relative humidity. “Wet” and “dry” bulbs refer to the two bulbs of a psychrometer
[ Posted on July 28th, 2006 at 15:30 | no comment | permanent link ]
