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Solution 2

# Solution 2 - And γ = 1.4 for air Hence 6.96 =-326.3 J/kg-K...

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Solution 2 The Carnot Cycle: Data Given: Pa = 3 MPa ; Pc = 100 KPa ; Tc = 20 C = 20 + 273 = 293 K ; Compression ratio = 15 = Vc/Va (a) Thermal efficiency = Now, (b) Work output = thermal efficiency * Qh Since process A to B is an isothermal process, hence PV = constant Therefore, Now, process B to C is an adiabatic process, hence,

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Unformatted text preview: And γ = 1.4 ( for air) Hence, 6.96 = -326.3 J/kg-K Work done = 326.3 * 0.5 *0.5 = 81.75 KJ/kg (c) MEP = work done/ ( Vc – Va) Therefore, Vc = 15Va To calculate Va, we use the gas equation, Therefore, = 0.056 * 10^(-3) Vc- Va = 14Va MEP = Work done / 14Va = 156.5 kPa...
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