lighting a rocket stove

[Deleted]

Posted by woodburner on Yesterday at 11:51am
I think fibreglass is not a good insulator at rocket stove temperatures. It might work up to perhaps 200ºC, but after that performance drops off because there is enough energy to move the air around in the relatively large voids.

In the insulation industry "convection loops" in low density non cellular insulation (especially loose fill insulation) are a well known phenomen, which is already observeable in winter conditions (delta T ~ 75°F).

Covering the insulation with an airtight barrier nearly eliminates the phenomen, except possibly at very large temperature differences.

[hpmer]

Would this suggest that a hollow void made of cob and filled with loose insulation would be an especially robust solution?

[Deleted]

Posted by hpmer on Today at 11:22am
Would this suggest that a hollow void made of cob and filled with loose insulation would be an especially robust solution?

Would be a simple and relatively cheap solution, though I prefer insulation that does not need a container..

I have a professional education in determining propper insulation for heat, noise and moisture in and around buildings.

The general rule for insulation against heat transfer in matter is "soft and lightweight".
Loose fill usually fulfills more or less both, but requires some kind of container.
For noise the rule would be "soft and heavy".

Cellular insulation beats loose fill and fiber insulation.
Loose fill with expanded material is something in between.
Several thin layers with different properties are working better than one single thick layer.

Radiant barriers or reflective barriers can be used to limit heat transfer by radiation.
E.g. aluminium foil.