- #1
EngNoob
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Homework Statement
Engine data for a heat engine cycle, ie: Diesel.
State ...|...1...|...2...|...3...|...4...|
Pressure(Pa) | 1x10^5 | 11.764x10^5 | 11.764x10^5 | 2.207x10^5 |
Volume(m^3) |. 0.826 .|... 0.142 ...|... 0.25 ...|... 0.826 ...|
The gas has a compression and expansion index of 1.4,
determine the work done in (kJ) in the cycle.
Homework Equations
I am not sure. But to have an attempt i would say.
Constant Volume: W = 0
Constant Pressure: W = P(V_2 - V_1)
Constant Tempreture: W = P_2 * V_2 * ln (V_2/V_1)
The Attempt at a Solution
I have done a P-v diagram, and came up with.
1-2: Istothermal (Constant Tempreture)
2-3: Isobaric (Constant Pressure)
3-4: Isothermal (Constant Tempreture)
4-1: Ischoric (Constant Volume)
I am unsure about
1-2 and 3-4 as it could be a polypropic process (Temp/Press/Vol Change) but i think this has to do with the exp/comp index? but not sure how to figure out?
I came up with
-30431.859(kJ)
I think this is wrong, as this would indicate mins work.
Do i need to convert PA to KPA or MPA?
I would welcome any help, advice, or some hints/tips.