Epidemic of cracked windshields in KDEN, explanation unknown

High winds. Low temps (-15F and up) == very cold wind chill factor.

On Feb 17, 7:09 pm, Blanche wrote:
High winds. Low temps (-15F and up) == very cold wind chill factor.

Common misconception. Wind chill only applies to the heat loss of
animals. It does not apply to inanimate objects. The only thing
wind will do to metal, glass, plastic, etc is help cool it faster to
the ambient temperature.

Kev

"Blanche" wrote in message
...
High winds. Low temps (-15F and up) == very cold wind chill factor.

I would think that's still balmy and calm compared to the flight levels. I
dunno why they cracked. The airlines also don't know, and they have been
thinking about this much longer than we have.

Blanche writes:

High winds. Low temps (-15F and up) == very cold wind chill factor.

Wind chill applies only to people, not things.

--
Transpose mxsmanic and gmail to reach me by e-mail.

In article ,
Mxsmanic wrote:
Blanche writes:

High winds. Low temps (-15F and up) == very cold wind chill factor.

Wind chill applies only to people, not things.

Not just people. Any warm blooded animal.

For that matter, any heat-generating source (object).

For that matter, any heat-generating source (object).

Are you sure about that? I thought water evaporation had a lot to do
with it.

Jose
--
Humans are pack animals. Above all things, they have a deep need to
follow something, be it a leader, a creed, or a mob. Whosoever fully
understands this holds the world in his hands.
for Email, make the obvious change in the address.

Wind chill has everything to do with how fast heat is lost from
someone at body temperature. It's widely held that the old data,
that's 'wind chill', is not a very accurate measure of the effect of
wind on flesh and there's some work going on for a better measure. The
statement the poster made about any heat-generating object is not
quite complete, I'm sure he meant to remind us that it's related to
the surface temperature of the object, or at least the surface
temperatture in no wind conditions.

Fans in your computer are there to move air mass against hot objects
to carry the heat away, they are trying to create 'wind chill' inside
the computer. You can google 'convective heat loss' or 'forced air
cooling' if you want to explore the subject in more depth.





s Itr has ewverything to do On Feb 21, 9:33 am, Jose
wrote:
For that matter, any heat-generating source (object).

Are you sure about that? I thought water evaporation had a lot to do
with it.

Jose
--
Humans are pack animals. Above all things, they have a deep need to
follow something, be it a leader, a creed, or a mob. Whosoever fully
understands this holds the world in his hands.
for Email, make the obvious change in the address.

"Tony" wrote in message
oups.com...
Wind chill has everything to do with how fast heat is lost from
someone at body temperature. It's widely held that the old data,
that's 'wind chill', is not a very accurate measure of the effect of
wind on flesh and there's some work going on for a better measure. The
statement the poster made about any heat-generating object is not
quite complete, I'm sure he meant to remind us that it's related to
the surface temperature of the object, or at least the surface
temperatture in no wind conditions.

Fans in your computer are there to move air mass against hot objects
to carry the heat away, they are trying to create 'wind chill' inside
the computer. You can google 'convective heat loss' or 'forced air
cooling' if you want to explore the subject in more depth.

Googling on "wind chill" nets a different set of results. Notice the human
reference in the following from weather.gov:

[[
Specifically, the new WCT index:

a.. Calculates wind speed at an average height of five feet (typical
height of an adult human face) based on readings from the national standard
height of 33 feet (typical height of an anemometer)
b.. Is based on a human face model
c.. Incorporates modern heat transfer theory (heat loss from the body to
its surroundings, during cold and breezy/windy days)
d.. Lowers the calm wind threshold to 3 mph
e.. Uses a consistent standard for skin tissue resistance
f.. Assumes no impact from the sun (i.e., clear night sky).
]]

In rec.aviation.piloting Tony wrote:
Fans in your computer are there to move air mass against hot objects
to carry the heat away, they are trying to create 'wind chill' inside
the computer. You can google 'convective heat loss' or 'forced air
cooling' if you want to explore the subject in more depth.

That's not what wind chill is about. You need to take into account
evaporative cooling, which has a significant effect.

.... Alan
--
Alan Gerber
PP-ASEL
gerber AT panix DOT com

I don't think so.

The windchill temperature is calculated using the following formula:

Windchill (ºF) = 35.74 + 0.6215T - 35.75(V^0.16) + 0.4275T(V^0.16)

Whe T = Air Temperature (F)
V = Wind Speed (mph)
^ = raised to a power (exponential)

Windchill Temperature is only defined for temperatures at or below 50
degrees F and wind speeds above 3 mph. Bright sunshine may increase
the windchill temperature by 10 to 18 degrees F.



On Feb 22, 2:12 am, Alan Gerber wrote:
In rec.aviation.piloting Tony wrote:

Fans in your computer are there to move air mass against hot objects
to carry the heat away, they are trying to create 'wind chill' inside
the computer. You can google 'convective heat loss' or 'forced air
cooling' if you want to explore the subject in more depth.

That's not what wind chill is about. You need to take into account
evaporative cooling, which has a significant effect.

... Alan
--
Alan Gerber
PP-ASEL
gerber AT panix DOT com