Download Analysis of Engineering Cycles by R. W. Haywood and W. A. Woods (Auth.) PDF

By R. W. Haywood and W. A. Woods (Auth.)

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Extra resources for Analysis of Engineering Cycles

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5, and the rational efficiency of the work-producing steam circuit, as calculated from eqn. 8. Take the environment temperature as being equal to the saturation temperature of the steam in the condenser, namely 38 °C. 3%. 5. 3, write down the values of the efficiency ratio and the rational efficiency of the work-producing steam circuit. 8; 80%. 6. 1 MN/m . Isentropic expansion is then continued down to 7 kN/m in the low-pressure cylinder. Calculate the percentage of the total work output that is performed by the HP cylinder.

Variation of QB, WT, W0 and for the point of maximum ηογ. After Hawthorne and Davis, Engineering 1 8 1 , 361 (1956). The straight line showing the variation in WC with qp is obtained by noting from eqn. 8) that WC varies linearly with qp and would have a value equal to cp(Tb—Ta) when the compressor outlet temperature Tv equalled Tb\ from eqn. c(0-l). 15) Thus WC cp(Tb-Ta) is equal to unity when qp = β. The straight line showing the variation of the heat input QB with qp is obtained by noting that QB also varies linearly with qp9 since it is given by QB = cJTi-Tr) = cp(Tb-Ta)- WC.

Thus Turbine isentropic efficiency, ητ = -A—,-—. A2 3—AZ4' For an ideal turbine this would be 100 % . 7. Lost work due to irreversibility Since the heat input to the cycle is unaffected by these irreversibilities, being still equal to (A3—A2X the reduction in Wntt is equal to the increase in heat rejected. If the exhaust steam is wet, as it always is in practice, then the lost work due to irreversibility may be simply expressed as Lost work = Increase in QA = Ta(SA" — SÌ) This quantity is equal to the area 4 " 4 5 5 " 4 " in Fig.

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