Second Law of Thermodynamics and Energy Sources

摘要

Let's try something that makes sense to me, but I am of simple mind so please feel free to argue or present a different model. Most energy starts with the sun as I shall develop below (nuclear probably doesn't, so I shall leave it out of the list). Solar energy changes form over time, and as the 2nd law teaches us, entropy goes up with each change. Doesn't it make sense to use the energy in the lowest entropy form (highest exergy) or closeness to the original solar? Of course a lot depends on the application. For example, if I need high temperatures, I will need a fuel.