Unformatted text preview: In a diesel cycle going from point -' --
A clockwise in the P-V diagram,
the gas—air mixture is first
adiabatically compressed (A —)
B), followed by an expansion at
constant pressure (B 9 C).
Next, an adiabatic expansion
takes place (C 9 D), before an
iso-volnrnetric process returns
the system to point A (D 7" A),
completing the cycle. Assuming
that the mixture is an ideal,
polyatomic gas with cv and Cp: -
a. Compute the heat transfer AQ:1 and the heat transfer AQC (3 + 2 points). i.
. I Q
i" AQM : WC“PAT : “C?(Tc— T3) AC9; : inc, AT : “CVCTVTQ Or- __..._ AG“ -; (SEEK? WEV thC’VA-Y 4‘ “RAT b: hCC,+R)AT = “($87
$162,: ”WNW = mm b. Denoting the temperatures at the respective points, A, B, C, D, as TA, TB,
Tc, and TD, express the efficiency of the cycle in terms of the temperatures (2points).
vial-lot 2 h—CﬁrgrQ- mtg—r,
[QM M ...
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- Spring '10