Heat transfer can get confusing and it is difficult at times to
determine whether radiation, conduction or convection is the primary
means. Convection is fluid movement, with natural convection (in
air) being warm air rising because it is lighter and being replaced
by cooler, heavier air. This replaces your boundary layer of warm
air at some rate that primarily depends on the temperatures
involved. Wind is sometimes referred to as forced convection where
wind currents rapidly replace your boundary layer of warm air. I'm
calling the boundary layer of warm air as the layer of air on the
outside of your insulation that you warm up some in still air.
But, you may be talking of wind currents actually flushing warm air
out of your insulation. Air mats are immune to that since they are
air tight. Some types of highly breathable insulation, like most of
the sleeping bags we use, are not immune to that and their
susceptibility is inversely proportional to how breathable they are.
I would call this how wind proof versus breathable it is rather than
labeling it as some form of convective heat transfer. Wind proofness
is a good thing in cooler, windy conditions while high breathability
is a good thing in warmer, stagnant conditions... usually we are in
the middle ground where it is six-of-one versus half-a-dozen of the
Hope I didn't confuse you.
--- In firstname.lastname@example.org, "Coy" <starnescr@...> wrote:
> I think you are right Jamie, from wind it would be convection. if
> are laying on the pad and heat is leaving the bottom of the pad then
> it would be a combination of convection and conduction. conduction
> would be the heat from your body the pad lets through for convection
> to then take on off. This of course assumes that the underside
> is colder than you on the top side.
> Coy Boy
> --- In email@example.com, "chcoa" <jdeben@> wrote:
> > Hi all,
> > I'm writing a report for BGT on the Women't ProLite I'm testing.
> > about to include a section on how it performed as bottom
> > my hammock with a reference to heat loss via the wind. I was
> > call this convection then I started second guessing myself and
> > though I looked it up, I'm not entirely sure convection is the
> > word to describe heat loss via wind.
> > Will someone who knows clarify for me please?
> > Thanks
> > jamie d