I thought this post by "Steven N. Karels is interesting.
Rossi hasn't answered yet because it would show his device can not work as advertised, if Steven's calculations are correct.
However Rossi does seem to be the expert at invisible heat exchangers, so he may use one of those.
I wonder if Rossi will answer with total BS, or just delete the post.
Steven N. Karels
December 4, 2019 at 6:29 AM
Dear Andrea Rossi,
Given a 1 kW total output and 30% of the generated energy going to thermal heat, a 10cm on a side cube, then the free air convective cooling is estimated to require a surface temperature in the 250C to 300C range in a 20C environment.
1. For your demonstration next year, do you plan on using a heat exchanger or forced air flow to keep the “cube” cool?
2. Is the control unit (the size of a pack of cigarettes) a separate unit from the “cube”?
3. If Yes to #2, will the control unit be in a different environment than the “cube”?