Help with the Carnot Cycle

1. Dec 1, 2011

stonecoldgen

1. The problem statement, all variables and given/known data
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)
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)

2. Relevant equations

Q=mc$\Delta$T

$\Delta$U=Q+W

$\epsilon$=1-Qout/Qin=1-Tlow/Thigh

3. The attempt at a solution
So it's basically using Qabca to find the efficiecy. The thing is that im not sure what to use for the Qs.

2. Dec 1, 2011

RTW69

What is Qs supposed to represent? I don't see it in your problem statement.

3. Dec 1, 2011

stonecoldgen

it's a plural for Q, I am not sure what to use for Qin and Qout

4. Dec 2, 2011

RTW69

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.