IIRC from my heat mechanics testing, which was (...checks notes...) five years ago now so my memory is foggy, 'heatdismax' and 'heatdismin' are misleadingly named because they aren't used in analogous ways; 'heatdismax' is the maximum rate at which the hull can dissipate heat (which it reaches when it is at 66% heat level), but 'heatdismin' is actually a heat level (measured not as a percentage but in arbitrary "heat units", just like the hull's heat capacity) below which the hull will still dissipate heat at a rate as if it were at that heat level, so that it never gets all the way down to 0 dissipation even at 0 heat level.I'm exploring how ship heat works, and was a bit puzzled by the fact that this equation uses 'heatdismax', since I had sort-of expected that 'heatdismin' might be playing a role for idle temperatures (not sure that makes sense now that I think of it though!).
However, reviewing the EDSY code it appears that heatdismin is never used in any of the calculations, and since there isn't even a fixed ratio between the min and max dissipation I'm forced to conclude that the minimum dissipation is bogus/meaningless data, given that EDSY does such a good job of predicting ship temperatures without recourse to it. I found a hint in the heat mechanics thread that the dissipation info came from FD somehow but I didn't actually find a source for it.
Is there any meaning at all to heatdismin?
But in practice that minimum threshold is so low that it basically never matters; a ship with absolutely everything disabled will generate 0 heat and thus cool down to 0% heat level, but a ship with even a single very low power module enabled will generate enough heat to reach equilibrium higher than that minimum level anyway. At least that's my fuzzy recollection.