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Old Oct 10th 2018, 05:37 AM   #1
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Coefficient of performance (COP) of this triangular cycle

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?

Last edited by Screwed; Oct 10th 2018 at 09:55 AM.
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Old Oct 10th 2018, 09:05 AM   #2
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Why you dH is 0 in 2-3??

Is it an open or closed system?
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Last edited by mscfd; Oct 10th 2018 at 09:23 AM.
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Old Oct 10th 2018, 09:57 AM   #3
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Originally Posted by mscfd View Post
Why you dH is 0 in 2-3??

Is it an open or closed system?
Closed system.
Because enthalpy depends only on temperature for ideal Gases.
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