How Do You Calculate Efficiency in a Carnot Cycle Involving Argon?

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Homework Help Overview

The discussion revolves around calculating the efficiency of a Carnot cycle involving argon, specifically focusing on a cycle described in a PV diagram with given points and thermodynamic quantities. The original poster has provided details about the moles of argon, isotherm temperatures, and energy exchanges during the cycle.

Discussion Character

  • Conceptual clarification, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to determine the efficiency using the heat exchanges involved in the cycle but expresses uncertainty about the correct values for Qin and Qout. Some participants question the definition and representation of Qs in the context of the problem.

Discussion Status

The discussion is ongoing, with participants exploring the definitions of heat exchanges and clarifying the nature of the cycle. There is an indication that some participants are providing guidance on the relationship between the heat exchanges and the efficiency formula, but no consensus has been reached regarding the specific values to use.

Contextual Notes

Participants note that the cycle in question is not a traditional Carnot cycle, which raises questions about the assumptions being made regarding the heat exchanges involved. There is also a mention of a specific Qin between points A and B that needs clarification.

stonecoldgen
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Homework Statement


its part VI) of a big problem, where:

0.12 moles of argon (40) undergoes the cycle abca described in the graph. Process ab lies on a 540k isotherm.

In the previious 5 sub problems, i figured that:

Tc=270k
Qbc=670J (lost)
Qca=400J (added)
Wab=370J
Wabca=100J


The PV diagram has points a,b and c where:

a=(1.5X10-3, 3.6X105)
b=(3X10-3, 1.8X105)
c=(1.5X10-3, 1.8X105)







Homework Equations



Q=mc[itex]\Delta[/itex]T

[itex]\Delta[/itex]U=Q+W

[itex]\epsilon[/itex]=1-Qout/Qin=1-Tlow/Thigh

The Attempt at a Solution


So it's basically using Qabca to find the efficiecy. The thing is that I am not sure what to use for the Qs.
 
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What is Qs supposed to represent? I don't see it in your problem statement.
 
RTW69 said:
What is Qs supposed to represent? I don't see it in your problem statement.

it's a plural for Q, I am not sure what to use for Qin and Qout
 
Remember this is NOT a carnot cycle. η= 1- Qout/Qin There is also a Qin between A and B. Do you know what it is? It is the Qout/ the Total Qin.
 

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