Chapter 6, Problem 6.110P

Problem 5.060 SI The figure shows the schematic of a vapor power plant in which 100 kg/s of water circulates through the four components operating at steady state. The water flows through the boiler and condenser at constant pressure and through the turbine and pump adiabatically. Kinetic and potential energy effects can be ignored. Process data follow: Process 4-1: constant-pressure at 4000 kPa from saturated liquid to saturated vapor. Process 2-3: constant-pressure at 20 kPa from x2 = 88% to x3 = 18%. m = 100 kg/s Boiler X2 = 88% X3 = 18% Water Pump Turbine Condenser 2 Determine thermal efficiency. Determine ởrvle, in kW/K. Determine if the cycle is internally reversible, irreversible, or impossible. v Step 1 Determine the cycle thermal efficiency. % the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor.…

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Figure 5.15 in the text gives a schematic of a Carnot cycle operating with a H2O liquid/vapor with a steady flow (constant mass flow rate) through each component. From the properties given below your cycle may or may not be a Carnot cycle. Kinetic energy and potential energy changes can be ignored in this problem. The cycle conditions are as follows: Process 4 – 1: constant pressure at 300 kPa from saturated liquid to saturated vapor Process 2 – 3: constant pressure at 30 kPa from x2 = 87.9% to x3 = 10.9% a) Determine the thermal efficiency using steam table data b) Compare the result of part a) with the Carnot efficiency using the boiler and condenser temperatures. c) State if the cycle is internally reversible, irreversible or impossible