It sounded like one of the tests only had the fake thermal image on one side, although I don't know if that is how it is intended to be used in the field. It is also possible to store some heat, but wouldn't last very long before the whole inside of the tank gets pretty warm, at least when running at full power. Or maybe do a better job of venting the heat into the air which is harder to notice if done carefully
It is also possible it is playing some tricks with emissivity. While, roughly speaking, all things of the same temperature give off the same thermal spectrum, some emit it brighter than others, and some thermal measuring equipment makes assumptions about this that can be messed with using low emissivity. Although the images make the tile look black, which tends to suggest high emissivity, at least with common materials.
It sounded like one of the tests only had the fake thermal image on one side, although I don't know if that is how it is intended to be used in the field. It is also possible to store some heat, but wouldn't last very long before the whole inside of the tank gets pretty warm, at least when running at full power. Or maybe do a better job of venting the heat into the air which is harder to notice if done carefully
It is also possible it is playing some tricks with emissivity. While, roughly speaking, all things of the same temperature give off the same thermal spectrum, some emit it brighter than others, and some thermal measuring equipment makes assumptions about this that can be messed with using low emissivity. Although the images make the tile look black, which tends to suggest high emissivity, at least with common materials.