Best Material to Use to Reduce Radiative Heat Transfer

franman

Hey guys,

Just looking for some opinions. Looking at what materials would be best to reduce radiative heat transfer. Basically need something that would wrap around a carboardbox and stop the contents of the box from heating up if the box is left exposed to sunshine for periods of up 6 hours at a time. Thinking Aluminium foil would be best. Any opinions??

tak

Yes.
Available in foil, affordable and effective enough.

godtabh

How would aluminium stop it heating up? The aluminium would heat up and heat the air its in contact with wouldnt it?

You want a medium thats a poor conductor of heat. Wood water are things that come to mind now.

Put your cardboard box container in a water proff box and put it in a bucket of ice water or maybe in a fridge

tak

Kearnsr,

I'd reckon he's sorted out the conductive/convective heating danger already, as he's only asked about radiative heat blocking.
He'd have it well insulated inside the box.
It's maybe a package going to a warm country and he's afraid of it heating up in transit if it's under direct sunlight or in a still hot warehouse.

He could put some perforated paper over the Al foil to protect it and at the same time let it dissipate absorbed heat from the sun.
Al is a good enough diffuser of heat received from the surrounds.
The insulation inside the box does the rest, as well as it may conveniently be done.

Of course we do not know what sort of bananas this dude is sending . . . .

franman

tak wrote: »

Kearnsr,

I'd reckon he's sorted out the conductive/convective heating danger already, as he's only asked about radiative heat blocking.
He'd have it well insulated inside the box.
It's maybe a package going to a warm country and he's afraid of it heating up in transit if it's under direct sunlight or in a still hot warehouse.

Hit the nail on the head there! Basically box has insulation aswell as cool packs inside. Just needed a cover to reflect the sun and add some radiative heat blocking. Thanks for the conformation that I was on the right track.

tak wrote: »

Of course we do not know what sort of bananas this dude is sending . . . .

LOL!! was waiting for someone to say something like this:D

godtabh

There is certain paints/colours that reflect the sun i.e dont paint it black but maybe white. Cant remember now