Steam at 1800 lbf/in.2 and 11008F enters a turbine

Chapter 4, Problem 4.51

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Steam at \(1800 \mathrm{lbf} / \mathrm{in} .^{2}\) and \(1100^{\circ} \mathrm{F}\) enters a turbine operating at steady state. As shown in Fig. P4.51, 20% of the entering mass flow is extracted at \(600 \mathrm{lbf} / \text { in. }^{2} \text { and } 500^{\circ} \mathrm{F}\). The rest of the steam exits as a saturated vapor at \(1 \mathrm{lbf} / \mathrm{in}^{2}\) The turbine develops a power output of \(6.8 \times 10^{6} \mathrm{Btu} / \mathrm{h}\). Heat transfer from the turbine to the surroundings occurs at a rate of \(5 \times 10^{4} \mathrm{Btu} / \mathrm{h}\). Neglecting kinetic and potential energy effects, determine the mass flow rate of the steam entering the turbine, in lb/s.

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