On Tuesday, January 7, 2014 1:24:53 PM UTC-5, Gordon Shumway wrote:
On Tue, 7 Jan 2014 05:38:06 -0800 (PST), "

wrote:



You don't need the windspeed at the pipe. The windspeed at the

pipe could be very low. The pipe could be out of the main

wind. But a 35mph 15F wind blowing into a drafty crawlspace

through a couple of openings could still drop the temp of the

rest of the crawlspace low enough to freeze the pipes, even

if the air around the pipes is barely moving. Your house gets

heated/cooled from a relatively modest amount of air blowing out

of registers.



Your above statement is absolutely correct. The wind chill in your

above example is unknown and irrelevant because the temp is 32� F or

below. Because of the air temperature the pipes could freeze. The

fact that the wind is blowing will only decrease the time required.

That's all I've been saying.



That isn't all you've been saying. You told us that "windchill has
no effect on inanimate objects" and you still won't admit that was flat
out wrong.

The windchill is relative, because one more time, the lower the
reported windchill, the higher the wind. Ergo, it's more likely
the pipes will freeze with a lower reported windchill. Windchill is
a proxy for windspeed.

And it's *not* just a matter of time. It's very common for people
to be worried about whether pipes will freeze on a night where
the temp goes significantly below zero. THAT was exactly the
question posed by Stormin that started the thread. Now if windchill
effects the amount of time it takes for pipes to freeze in a
drafty crawlspace or an unheated cabing, then it follows that
on nights where the temp drops below freezing overnight and
then returns to above freezing at 9AM, with windchill the pipes
may have enough time to freeze. With no windchill, they are less
likely to have the time to freeze. Capiche? In one case you
have frozen pipes, in the other with no windchill, you don't.

And I'd also note that it's not just a matter of time. In
a drafty crawlspace under a heated house, in some cases, with
no reported windchill, the pipes might never freeze, even if
it stays 20F outside forever, while with a big windchill reported, they
may very well freeze. Why? With the big windchill the wind
may be necessary to drop the steady state temperature below
freezing where the pipes are.




Snip



Here, from the Weather Channel:

http://www.weather.com/activities/ho...e_prevent.html





"Pipes in attics, crawl spaces and outside walls are all vulnerable to freezing, especially if there are cracks or openings that allow cold, outside air to flow across the pipes. Research at the University of Illinois has shown that €œwind chill,�? the cooling effect of air and wind that causes the human body to lose heat, can play a major role in accelerating ice blockage, and thus bursting, in water pipes."





From City of Rochester:



http://www.rochesternh.net/public_Do...ER%20PIPES.pdf

"Pipes inside or outside walls, or in an enclosed area can freeze,

especially when the wind-chill factor is well below zero and heat is

not circulating in those areas."



Because you found it on the Internet doesn't make it true. Hell, the

one example I gave earlier you picked apart.

The one example you provided, NOAA proved you wrong. They clearly said
flat out that wind chill has an effect on inanimate objects and they
even said water pipes. Time to take off
those rose colored glasses and read what's there, instead of what you
want to make believe.

As for impeaching the internet, that canard won't fly. There isn't one
source called "the internet". I gave you NOAA, Weather Channel, City of
Rochester, etc, not some kook websites.