DESIGN PROBLEM: Design the condenser of a steam power plant that has a thermal efficiency of 40 percent and generates 13

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Design Problem Design The Condenser Of A Steam Power Plant That Has A Thermal Efficiency Of 40 Percent And Generates 13 1 (145.57 KiB) Viewed 49 times

DESIGN PROBLEM: Design the condenser of a steam power plant that has a thermal efficiency of 40 percent and generates 13410.2 hp (10 MW) of net electric power. Steam enters the condenser as saturated vapor at 1.45 psi (10 kPa), and it is to be condensed outside horizontal tubes through which cooling water from a nearby river flows. The temperature rise of the cooling water is limited to 15°F (8.3 °C), and the velocity of the cooling water in the pipes is limited to 20 ft/s (6 m/s) to keep the pressure drop at an acceptable level. Specify the pipe diameter, total pipe length, and the arrangement of the pipes to minimize the condenser volume. The design must be within the allowable parameters and dimensions listed below: Part/Dimension Outside diameter Inside diameter Value range 0.68 -0.8 in 0.45 - 0.55 in Parameters Thermal conductivity Fin resistance Ranges/value 17 BTU/(A°F.hr.ft) (0.68 - 7.2)x104 A°F.hr.ftP/BTU 0.18-0.22 22 - 26 °C Root diameter Outside heat transfer area Inside heat transfer area Inside flow area per tube Fin height 10 kPa 40% 0.60 -0.68 in Friction factor 0.47 -0.54 ft/ft Cooling water inlet temperature 0.10 -0.2 ft/ft Saturation pressure 0.15-0.22 in Power plant thermal efficiency 0.05 -0.06 in Power plant net electric power out 0.055 -0.011 in Outside fouling resistance factor 0.018 - 0.27 in Inside heat transfer coefficient 10 MW Fin Thickness Fin spacing 0.001 -0.002 A°F.hr. ft/BTU 2300 - 2400 BTU/ A°F.hr.ft) Outer diameter of shell 36 -40 in 2900 - 3000 BTU/ A°F.hr.ft) 1 Baffle spacing 24 - 25 Inside heat transfer coefficient Correction Factors for shell construction Number of tubes in 0.91 in 1458 - 1462 0 Length of tube 26 - 30 ft Pitch diameter based of equilateral triangle Number of sealing strips per side Tube pitch parallel to tube Tube pitch normal to tube Heat loss 0.8 -0.84 in Inner diameter of shell 38 - 40 in 0.4-0.5 in 0.6 -0.62 Correction factor for baffle leakage Correction factor for pressure drop 0 0.89 -0.91