We were given a diesel cycle PV graph, which we were to use to determine pressure, volume, and temperature at given points as well as the heat, work, internal energy, and entropy at sections between points. As a result, we should be able to calculate the efficiency of the engine given the information provided and necessary equations.
At different point's and steps we used the various equations that were needed for adiabatic compression, constant pressure, and constant volume. Furthermore, we used our understanding of the relationships under certain conditions to eliminate either Q, W, or delta U.
We were supposed to get a total internal energy of zero based on the theory of a cycle, which states that between the work and heat transfer the overall system should be zero at the end. I ended up getting 50 J over which I failed to find the mistake.
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