Ive seen thermal rigs which instead of insulation used heaters
Ie heatsource - some insultation - heater.
Heater temp is aligned to current heatsource. No temp differential, no heat transfer. Equilbrum should be fast but added complexity
I'll have a look around for stuff. I know some people in my year did a precise thermal test rig for plastics last year but i should have a paper with ideas somewhere or other.
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