Question: Consider a Diesel cycle that starts (at point a in Fig. 20.7) with air at temperature Ta. The air may be treated as an ideal

Consider a Diesel cycle that starts (at point a in Fig. 20.7) with air at temperature Ta. The air may be treated as an ideal gas.
(a) If the temperature at point c is Tc derive an expression for the efficiency of the cycle in terms of the compression ratio r.
(b) What is the efficiency if Ta = 300 K, Tc = 950 K, Y = 1.40, and r = 21.0?

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IDENTIFY Calculate Qc and Q in terms of p and V at each point Use the ideal gas law and the pressurevolume relation for adiabatic processes for an ideal gas e1c OH SET UP For an ideal gas C C R and taking air to be diatomic C 3R C R and y 3 EXECUTE Referring to Figure 207 in the textbook Q nRT T pV PV Similarly Qc nRpV PV What needs to be done is to find the relations between the product of the pressure ... View full answer

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