I have this problem: (it is not triangular really, just 3 steps in a closed system)

Here's my solution attempt:

**NOTE: Evolution 2 to 3 is really an isothermic process, but in the diagram shows as an politropic process.**
So...

**But it isn't giving me logical values of COP when I compare it with a reverse cycle of Carnot. **
Questions:

*How could I calculate the COP and COPmax of this cycle? Not sure how to arrange heats and work on COPs formula for a triangular cycle like this one.

*Can my COP be greater of that of a comparable Carnot's cycle?