Hello @Nertea and everyone.
I am playing with System Heat along with other compatible mods (Near Future, Far Future, Kerbal Atomics, ...) for some time and I am having a few issues I wish to be addressed.
1. There are not enough aero dynamic radiators which makes atomic motors and reactors practically not usable in atmosphere. There is only one small YF series for each fuselage size but you need 100ish such radiators to cool 1500kW Stubber Atomic Motor for example.
2. There is no thermal consumers other than radiators. I wish there is thermal electricity generator to make use of the heat.
3. Atomic reactor's efficiency is too poor. Here, atomic reactor includes thermal electricity generator which is its main role. But it seems most of reactor's heat is wasted instead of generating electricity. Or generating too much heat for its generated electricity. Convert-O-Tron, a small chemical factory, generate mere 40kW heat but a compact fission reactor is wasting a thousand kW heat after generating electricity. In RL, Nuclear submarines are (almost) closed system as well and I've read, discharged cooling seawater is not even boiling. Most heat is used by power generator.
4. It seems Heat energy is just added and converted to temperature increase linearly. I suggest heat increment should be inverse exponential because there is no perfect heat loop. I mean 0.4 version's new convection should be more evident, even in space and even more in atmosphere, and exponentially as temperature go up, and temperature and convection reach Equilibrium eventually. It just doesn't feel right that it goes up a few thousand degree too easy and too quickly.
5. At first it was very confusing about System Heat because there is Near Future System Manager and Legacy Heat parameters. Took some time to understand Legacy heat parameters (xFer value and max cooling) are not used. And with optional modules and patches, whenever something does go not as I expected, I had to try different option/patch modules thinking my setup was not right. It is good to have many choices. Just these combined, things were not straightforward.
Well, I am not complaining. I am very happy user of @Nertea's eco system and spending a few days now working on MK4 cargo shuttle. Much appreciations to @Nertea and just wish my suggestions be helpful.