Cogeneration Plant: Ideal Cycle Analysis for Water as Working Fluid

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Discussion Overview

The discussion revolves around the analysis of a cogeneration plant utilizing water as a working fluid, specifically focusing on identifying the type of thermodynamic cycle it operates under. Participants explore concepts related to ideal cycles, including the Rankine cycle and its regenerative variant, while considering assumptions of ideal behavior in the system.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant questions the type of cycle for a cogeneration plant using water, suggesting it could be either a Brayton or an ideal Rankine cycle.
  • Several participants propose that the cycle is likely the ideal Rankine cycle, with one suggesting it might be a regenerative Rankine cycle.
  • There is a discussion about the representation of the throttling valve in the T-s diagram, with one participant questioning its necessity and another clarifying that a pump is needed to complete the cycle representation.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the specific type of cycle, with some favoring the ideal Rankine cycle and others suggesting the regenerative variant. The discussion remains unresolved regarding the exact classification of the cycle.

Contextual Notes

Participants assume ideal conditions such as no pressure drop and no heat loss, but these assumptions may not be universally agreed upon. The discussion also highlights potential confusion regarding the roles of different components in the cycle.

bluepleiadez
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Homework Statement


The question asked about a cogeneration plant with water as a working fluid, but I am not sure what type of cycle it belongs to. The plant uses utility heat and steam can be throttled.


Homework Equations


The system was assumed to be ideal, no pressure drop, no heat loss and is internally reversible.


The Attempt at a Solution


Brayton, ideal Rankine cycle?
 
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I would think it would be the ideal Rankine cycle.
 
rock.freak667 said:
I would think it would be the ideal Rankine cycle.

I believe it's regenerative rankine cycle?
 
bluepleiadez said:
I believe it's regenerative rankine cycle?

Yeah that's it, I couldn't remember how the regenerative cycle's T-s diagram looked like. But it should be that one.
 
rock.freak667 said:
Yeah that's it, I couldn't remember how the regenerative cycle's T-s diagram looked like. But it should be that one.

I can leave out the throttling valve in the ts diagram right?since the valve does not give power...but increases pressure?
 
bluepleiadez said:
I can leave out the throttling valve in the ts diagram right?since the valve does not give power...but increases pressure?

I think you mean pump and not throttling valve? But you'd need to have it, else your diagram won't make a cycle.
 
rock.freak667 said:
I think you mean pump and not throttling valve? But you'd need to have it, else your diagram won't make a cycle.

Ya okay I got it. Thnks for ur input! :)
 

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