My question is that: I cannot get a large temperature(color) change in particle trace, since I already set a significantly large heat flux on some equipment. I wonder if the problem is my very coarse mesh or wrong boundary conditions, or wrong end time maybe?
I found a project that is similar in setup: SimScale - as you can see the mesh is already a good starting point to optimize your simulation. As for the BCs, you can have a look at the heat sources and how these differ quantitatively.