Posted by Gerald J. on November 23, 2008 at 21:23:41 from (4.254.66.232):
In Reply to: Wind Chill posted by John B. on November 23, 2008 at 19:26:41:
You are right that wind chill shouldn't affect machinery, but wind chill has to do with evaporation of water from the skin, causing the skin (or a pan of water) to be colder than the dry bulb temperature. Since a good radiator is dry on the outside, wind chill as defined by the weather service has no effect. Sure wind will cool it faster, but that's not what the NWS wind chill number is. Dry air cools the skin more than damp air blowing by.
Actually the formula for wind chill was created by a couple Florida natives assigned to Duluth. MN and was basically how cold they felt for various winds and drybulb temperatures. A few years back the formula was revised by northern natives to not be so severe.
And the heat index in the summer was similarly devised by Duluth, MN natives working in Texas. At least one Duluth MN weatherman that I know starts to sweat at 65 degrees F. That heat index formula has also been calmed.
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