Diesel Engine Problem - Find total work

[Pauli_Pocket]

Homework Statement

The problem is in the attached document

Homework Equations

attached in pdf document

The Attempt at a Solution

1->2 adiabatic compression

T2=(V2/V1)^1-(Cp/Cv) = 987.7K
w1=nCvdT = (1mol)((3/2)*8.314J/molK)(987.7K-298K) = 8601.3 J

2->3 w2=-PdV=-Pmax(V3-V2) = 66.29bar(V3-0.1L)

3->4 w=nCvdT = (1 mol)(3*8.314J/molK)(T4-T3)

4->1 w=0
dH=nCpdT?

 

[LawrenceC]

"2->3 w2=-PdV=-Pmax(V3-V2) = 66.29bar(V3-0.1L)"

This relationship is for a reversible isothermal process. 2-3 is the combustion portion of the cycle and is not isothermal. This can be noted on a temperature-entropy plot for the diesel cycle.