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Thermo Take Home Test #1 - Point Mdot P kPa T degC Quality...

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Unformatted text preview: Point Mdot, P, kPa T, degC Quality v, Enthalpy, Exergy, kg/s mA3/ kg kJ/kg kJ/kg 31.892 40,000 600 Vaor 0.008094 3346.4 6.0113 28.918 2,000 212.42 98% 0.097658 2761.7 6.0113 2,000 500 Vaor 0.17568 3467.6 7.4316 20 60.06 97% 7.4199 2538.96 7.6962 31.892 20 60.06 Sat. Liq. 0.001017 251.38 0.83190 31.892 500 151.86 Sat. Li. 0.001017 251.87 1.3201 31.892 500 151.86 Sat. Liq. 0.001093 640.21 1.8606 31.892 40,000 151.86 Sat. Liq. 0.001093 683.38 || 03 || 5\ | Q 11 2.9745 5,000 264 Sat.Li. 0.001286 1154.2 2.9201 12 31.892 500 351.13 Vapor 0.61622 3170 7.4316 Each pump has an isentropic efficiency of 90%. 1) Compute the enthalpy and exergy values for each state. Clearly state the ambient “dead state” temperature used (15, 20, 25 C, etc.). All data should be reported to 5 significant digits. Calculate the: 2) power required for pumps A and B 3) second law efficiency for the HP and LP turbines 4) second law efficiency for the closed and open feedwater heaters 5) overall plant thermal efficiency 6) overall net power produced by the plant 7) overall irreversibility (rate of exergy destruction) of the plant 8) overall second law efficiency of the plant 9) show each state and the cycle on the attached p-h diagram Students can work in teams of up to 3 members. Students can discuss the exam with students in other teams, but each team must list names of students (or faculty) that they discuss this problem with, both if you gained information or provided information in the discussion. Students can use online resources, such as http://www.steamtablesonline.com. Submit paper copy of work at beginning for in-class portion of exam. Students can ask questions of the instructor, but each question will result in a deduction of 5pts from the grade. UI'SA ME 4293 Thermodynamics 11 Name: Exam 1, Take Home Portion, Spring 2010 (please print) Due: 3 :30 pm on Thursday February 1 1, 2010 Bonus of 5pts if turned in at 3:30 pm on Tuesday, February 9, 2010 [50 pts] A flow diagram for a Rankine cycle power plant is given below. Mass flow rates and the various states in the cycle are shown in the table. The cycle includes: high-pressure turbine, low-pressure turbine, reheat, closed feedwater heater (CFWH), open feedwater heater(OFWH), and two pumps (A and B). The turbines, pumps, and feedwater heaters are adiabatic. There is a restriction in the line after state 11 as the water enters the OF WH. f’S'J um £17m; : 1): ”0 «Hwy kw?!" fimrfi/ 7%”! 11y (M/o-4M7L Jo 1% Jamaamoé/ija'v ’2), ”Var/(”£77 #[4/0/ Mflaérjuj ”file/flay 17/1/1154 //ficeJ’JeJI § a; 1'7‘ ”flare; Many/2 #6 flw/Még; / /wm/as 1‘ ‘ (Wee/n éfltfd'fi/l aflmfir, and mmcpm. 3) kr/‘Iehé 412/ 19077476” (flay? ,e/Wwfl 4/e ”eff/Iéé. 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