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

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

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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. 7%. 7. The expansion in a turbine is adiabatic and irreversible. 939 kJ/kg K, and the turbine exhausts at a pressure of 7 kN/m . 91, calculate the lost work due to irreversibility per kilogram of steam flowing through the turbine.

In an air-standard Joule cycle the temperatures at compressor inlet and outlet are respectively 60 °Cand 170°C, and the temperature at turbine inlet is 600 °C. Calculate (a) the temperature at turbine exhaust; (b) the turbine work and compressor work per kg of air; (c) the thermal efficiency of the cycle; (d) the pressure ratio. 71. 2. In a closed-circuit gas-turbine plant using a perfect gas as the working fluid, the thermodynamic temperatures at compressor and turbine inlets are respectively Ta and Th.

2 Exact T/RANK = A 3- A 4 A3-A1 21 X100 = 3 2 . 8 0 % . 2 X100 = 3 2 . 8 4 % . 5. Comparison of actual and ideal performance—the efficiency ratio Since the Rankine cycle efficiency is the rational criterion of excellence against which to compare the measured cycle efficiency of an actual steam plant, the ratio of the latter t o the former will give a measure of the excellence of performance of the actual plant. This ratio is called the efficiency ratio. It is a more informative measure of the plant performance than is the cycle efficiency, since a statement of the latter conveys n o information as t o how much better, in theory, the performance could have been.

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