[TheForge] winter storm and equipment

[Bruce .]

Re: wind chill.

Any object warmer than ambient will be cooled by wind chill till it is no
longer above ambient.  (An object cooler than ambient can likewise be
heated.)

Any object wet with water or other volatile liquid will be cooled until
either the liquid is gone or the "dew point" of the liquid in the air has
been reached.  (This is the same phenomenon in use in A/C systems and
refrigerators.)  In principle, there is no limit to such cooling, aside
from the dew point, but in practice the volatility of the liquid decreases
as the temperature of the object (or the air) decreases, so there is an
effective limit, approached asymptotically.

In the case of water, the dew point is an obvious parameter, related to
relative humidity.  In the case of other liquids, it is unlikely that the
air will reach the dew point w/Re: these liquids, so the calculation can
assume all of the liquid will evaporate.

I'm not an engineer, so I won't submit a formula.  However the temperature
drop relates to the heat capacity of the object being cooled, the heat
capacity of the liquid, and the mass of each.

Bruce
NJ


On Mon, Jan 6, 2014 at 9:32 AM, Mike Mastrangelo <
mikemastrangelo100 at gmail.com> wrote:

> Also from National Weather Service
>
>
>
> *10. How is the Windchill is calculated?*
>
> The wind chill temperature is calculated using the following formula:
>
> Windchill (ºF) = 35.74 + 0.6215T - 35.75(V^0.16) + 0.4275T(V^0.16)
>
> Where: 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
> wind chill temperature by 10 to 18 degrees F.
>
>
> On Mon, Jan 6, 2014 at 8:31 AM, <wmullett at bright.net> wrote:
>
> > Wind chill only affects exposed moisture - like your on your skin.  It
> has
> > no affect otherwise.
> >
> > ---- Original message ----
> > >Date: Mon, 6 Jan 2014 14:26:00 +0000
> > >From: theforge-bounces at mailman.qth.net (on behalf of Ron Childers <
> > ron at munlaw.net>)
> > >Subject: Re: [TheForge] winter storm and equipment
> >  >To: Blacksmithing List Sponsored by ABANA <theforge at mailman.qth.net>
> > >
> > >How much does wind chill affect the freezing of a water tank, pipes,
> etc?
> > What is the formula for computing wind chill?
> > >
> > >-----Original Message-----
> > >From: theforge-bounces at mailman.qth.net [mailto:
> > theforge-bounces at mailman.qth.net] On Behalf Of Dan Brewer
> > >Sent: Sunday, January 05, 2014 11:58 PM
> > >To: terry l. ridder; Blacksmithing List Sponsored by ABANA
> > >Subject: Re: [TheForge] winter storm and equipment
> > >
> > >If you haven't done so already cover the equipment with a blanket and a
> > tarp that is tied down.  If you have a block heater plug it in . If not a
> > >100 watt light in a can attached to the oil pan or block will keep it
> > from freezing.  Keeping the equipment covered will help the retention of
> > heat.
> > > Best of luck.
> > >Dan in Auburn WA
> > >
> > >
> > >On Sun, Jan 5, 2014 at 5:12 AM, terry l. ridder <terrylr at blauedonau.com
> > >wrote:
> > >
> > >> hello;
> > >>
> > >> a simple question.
> > >>
> > >> in this winter storm, of the likes we have not seen in decades,
> > >> equipment particularly tractors, generators, hyrdraulics, etc. should
> > >> that equipment be started and set to idle for the duration of the
> > >> storm to ensure that none of the oil becomes like tar and that none of
> > >> the coolant systems freeze. basically, 24x7 until the storm is over.
> > >>
> > >> the equipment is all winterized but i have serious doubts about being
> > >> good to an actual -45 degrees F.
> > >>
> > >> --
> > >> terry l. ridder ><>
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