On 10/10/2013 12:59, The Natural Philosopher wrote:
On 10/10/13 12:24, Fredxx wrote:
TNP doesn't understand radiation. He believes the most significant heat
transfer in a gas is through conduction.

That's because actually it is

Untrue. Dry air is a supremely good insulator if you prevent it from
moving about by enclosing it in a foam. The most impressive being
aerogel which is to a very good approximation immobilised air.

http://en.wikipedia.org/wiki/File:Ae...r_filtered.jpg
http://en.wikipedia.org/wiki/Aerogel

Double glazing and fridge insulation also relies trapped air or a higher
molecular weight blowing agent being an extremely good insulator.

Helium or hydrogen are comparatively good conductors of heat for a gas. eg

http://www.engineersedge.com/heat_tr...vity-gases.htm

In many cases.

Radiators dont heat your house through radiation, but about 80% by
convections which is assisted conduction.

That is a very unusual and perverse definition of conduction you have
there Humpty Dumpty. Bulk movement of the working fluid to transfer heat
energy is convection just like the granulation cells on the solar
photosphere or easily seen on the surface of hot oil in a frying pan.

gases dont radiate much at room temperatures. The energy is the fourth
power of temperature.

Diatomic ones barely at all. Polyatomics like CO2, H20, O3 and CH4 do
which is why they are opaque to some thermal IR and make a difference.

This is sufficiently dumbed down as to pssibly be withing your grasp

http://www.g9toengineering.com/resou...attransfer.htm

As I have said time and agan, heat loss from the earths SURFACE is not
except in dry desests primarily radiation. It is via convection and
advection of water vapour and thereby to clouds, and clouds do the final
radiation into space. No one disputes this, but cO2 fanatics ignore it
and hand wave it away. Because its impossibly hard to model.

No they don't you are creating straw men here.

And because clouds sit high up in the atmoshere, what the compositiion
of the atmoshere underneath is, is totally irrelevant to their activity
in radiating heat away.

In the thermal IR bands where the atmosphere is opaque thermal IR
photons have to complete a random walk to escape.

IPCC climate models are based on O level physics, at best. They simply
'paraemeterise' all the important detail and hand wave it away, just as
you do. But you cant do that and get an accurate preduction.

Which is why they never have.

In your dreams.

--
Regards,
Martin Brown