Calculating entropy generation of a process

[albertov123]

Lets say we have T₁. From a reservoir 4000K, Q is added and that makes the temperature T₂.
How do we calculate the entropy generation in a process like that?

Isn't it S_gen=S₂ - S₁ - (Q/T)

But which temperature we will use in the (Q/T)? T₁, T₂ or 4000K?

 

[Chestermiller]

4000 k