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7.92 A pump operating at steady state draws water at 55°F from 10 ft underground where the pressure is 15 lbf/in.2 and deliversit 12 ft above ground at a pressure of 45 lbf/in.2 and a mass flow rate of 30 lb/s. In the absence of internal irreversibilities, determine the power required by the pump, in horsepower, ignoring kinetic energy effects. The local acceleration of gravity is 32.2 ft/s2. Would the actual power required by the pump be greater or less than the calculated value? Explain.
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Calculate with the Peng-Robinson equations for thermodynamic properties, the product compositions, stage temperatures, interstage flow rates and compositions, reboiler duty, and condenser duty for the distillation specifications
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Using the tables for water, determine the specific entropy at the indicated states, in Btu/lb ? 8R In each case, locate the state by hand on a sketch of the T-s diagram.
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