Just to check, you're not saying the ISS is designed to retain heat are you?
Because it has like 6 quite large radiators for getting rid of heat.
CMDR CTCParadox
Here read this page. If NASA cant explain it to you then nobody can.
https://www.nasa.gov/mission_pages/station/structure/elements/radiators.html#.V7vDOJgrJPY
Tis easy to understand. The ISS needs to maintain internal temperature and sometimes vent heat. It maintains internal temperature via insulators and special coatings to try and keep the living space at a livable level. Sometimes they do experiments and they have to use a bunch of electronics. So they have to unfurl the radiators and vent that extra heat. The ISS is insulated yet it cant spend all of the extra energy. It has to do this because it doesnt fly anywhere it doesnt shoot lasers. It doesnt maintain an energy shield. Heat is Energy and the only way that ISS gets rid of it is through radiators.Our ships can because they are constantly on the move.
Since you are moving through space constantly you would be dumping that heat through your thrusters. Your whole outer hull is a radiator. Thats why I said the thing about the surface area. Plus you are maintaining a life support system for a max crew of 4 people.
The only ships that might have trouble would be the passenger liners because they have to maintain a living environment for many many people. Passenger liners would need both and active and passive heat exchange system running at all times for fear of freezing or melting their passengers. Traders, Fighters, and explorers are constantly on the move constantly venting energy via weapons and thrust.
So yes if a space fighter did existed it would be very easy to vent extra energy into thrust, shields, or weapons.
Why are we even talking about this game as if its 100% Scientifically accurate. For crying out loud you can hear laser blasts and see explosions in space. When we fire projectiles it does not slow us down or move us backwards in the opposite direction that we are firing. This is a game and I don't really think we should be going into the laws thermodynamics and conservation of energy to try and prove a point. Its a video game.