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Theory 5 - Output work of engines with ideal Stirling cycle Thermodynamic cycle workThe thermodynamic work available during one complete cycle is given by integration of the P(V) curve in the the PV diagram (area of the internal surface of the cycle).
The ideal Stirling cycle is composed of two isothermal curves Ph(V) = nkBTh/V and Pc=nkBTc/V and two isochore segments (V=cste). Therefore the work Wthermo_ideal is given by :
where n is the number of molecules, kB is the Boltzman constant and r is the compression ratio Vmax/Vmin
Mechanical cycle work applied to the shaft (optimally buffered engines)The work available as output of the engine is the product of the thermodynamic cycle work by the mechanical efficiency discussed in the previous chapter. Wshaft_ideal = Emeca_ideal * Wthermo_ideal Graph for one mole of gas and mechanism effectiveness E = 0.7, the engine is optimally buffered:
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