FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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2. An ideal RANKINE cycle delivers 210 MW of power. Steam enters the turbine at 10 MPa and
500C and is cooled in a condenser at 10 kPa
a. Determine the thermal efficiency of this cycle
b. Mass flow of water
c. Heat rejected in the condenser
d. Work inputted to the pump (remember the volume is constant)
e. Quality of the Steam at the turbine exit
A simple rankine ideal cycle with water as the working fluid. Twenty kilograms of steam enters the turbine at 7.1111 MPa and 500.1111 oC and is cooled in the condenser at a pressure of 10.1111 KPa by running cooling water from a lake through the tubes of the condenser at rate of 2000 kg. Show the T-s diagram and schematic of simple rankine cycle. For cycle determin (a) the turbine work, (b) the heat added, (c) the temperature rise of the cooling water, (d) the thermal efficiency of the cycle. For engine, determine (e) the heat added, (f) the thermal efficiency of the engine, and (g) Draw the T-s and schematic diagram.
8.20 Water is the working fluid in an ideal Rankine cycle with reheat. Superheated
vapor enters the turbine at 10 MPa, 320°C, and the condenser pressure is 8 kPa. Steam
expands through the first-stage turbine to 1 MPa and then is reheated to 320°C.
Determine for the cycle
a. the heat addition, in kJ per kg of steam entering the first-stage turbine. 3310.06
b. the thermal efficiency. 37.2%
c. the heat transfer from the working fluid passing through the condenser to the
cooling water, in kJ per kg of steam entering the first-stage turbine. 2078.2
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- 3.) A steam power plant uses the ideal Reheat-Regenerative Rankine cycle where the steam enters the high-pressure turbine at 4 MPa and 300C. It partially expands to 600 kPa where some steam is extracted for feedwater heating while the rest is reheated to the same temperature. After expanding again, it enters the condenser at 10 kPa. Sketch the schematic diagram and the TS diagram with labeled points, and solve for mass taken for feedwater heating, Qa, Qr, Wt, Wp, Wnet, thermal efficiency, and Steam rate. Neglect the condensate pump work. kJ kj kJ kJ kJ kg 1715.88- 20.01%, 2667.84- 955.97 3.74 951.96 35.68%, 3.78. " J kg kg kg kg kWh kg "arrow_forward3.) A steam power plant uses the ideal Reheat-Regenerative Rankine cycle where the steam enters the high-pressure turbine at 4 MPa and 300C. It partially expands to 600 kPa where some steam is extracted for feedwater heating while the rest is reheated to the same temperature. After expanding again, it enters the condenser at 10 kPa. Sketch the schematic diagram and the TS diagram with labeled points, and solve for mass taken for feedwater heating, Qa, Qr, Wt, Wp, Wnet, thermal efficiency, and Steam rate. Neglect the condensate pump work. kg 20.01%, 2667.841715.52955.97 k, 3.74, 952.32,35.69%, 3.78 kg kWh Specific Volume Internal Energy Temp Enthalpy Prom MP Entropy Sal Sat, Sat. Liquid Sat. Sat. Liquid Evap. Vapor Liquid Uy Evap. Sat. Vapor t Р 10% Evap. Vapor Up u, hr Liquid S, h h₂ 8% 8₂ 006113 .01 1.0002 206 136 .0007 1.89 1.0001 181 255 3.77 1.0001 159 675 1.0001 142 789 0005 ,00 2375.3 2375.3 7.90 2370.0 2377.9 15.81 2364.7 2380.6 22.88 2360.0 2382.9 01 2501.3 2501.4 7.91 2496.9…arrow_forwardIn an ideal Rankine cycle, steam is generated at 4.1 MPa and 486.5°C. The condenser is at 32°C. Determine: (Sketch the T-S Diagram and Schematic Diagram of the cycle) (28 ) a. The ideal pump work b. The cycle thermal efficiencyarrow_forward
- Steam is the working fluid in an actual Rankine cycle. Steam enters the turbine at 8.0 MPa and 550 deg. C; and saturated liquid exits the condenser at a pressure of 0.008 MPa. The net power output of the cycle is 110 MW. The turbine and the pump each have an isentropic efficiency of 83% Illustrate and label the TS diagram and determine the cycle (a) the cycle thermal efficiency (b) the back work ratio (c)the mass flow rate of the steam, in kg/h, (d) the rate of heat transfer into the working fluid as it passes through the boiler, in MW, (e) the rate of heat transfer, from the condensing steam, as it passes through the condenser, in MW, (f) the mass flow rate of the condenser cooling water, in kg/hr., if cooling water enters the condenser at 15 deg. C and exits at 35 deg. C.arrow_forwardIn a reheat cycle steam at 15 MPa, 540°C enters the engine and expands to 1.95 MPa. At this point the steam is withdrawn and passed through a reheater. It reenters the engineat 540°C. Expansion now occurs to the condenser pressure of 0.0035 MPa. (a) A 60,000 kw turbine operates between the same state points except that the steam enters the reheater at 1.95 MPa and 260°C, departs at 1.8 MPa and 540°C. The steam flow is 147,000 kg/hr, generator efficiency is 96%. For actual engine, find, ek, mk, and nk, (b) Determine the approximate enthalpy of the exhaust steam if the heat lost through the turbine casing is 2% of the combined work.arrow_forwardA team power plant operates on an ideal reheat Rankine cycle. The plant maintains the boiler pressure at 17.5 Mpa, the reheater section at 2 Mpa and the condenser at 1 kPa. Steam enters both stages of the turbine at 900 oC. If the mass flow rate is 12 kg/s, determine:a) The total rate of heat input in the boiler;b) The total rate of heat rejected in the condenser;c) The power produced in MW;d) The thermal efficiency of the cycle in %._________. h1 (kJ/kg) Format : 72.507 v1 (m3/kg) Format : 0.003 wP_in (kJ/kg) Format : 83.8 h2 (kJ/kg) Format : 85.6 h3 (kJ/kg) Format : 3979.3 s3 (kJ/kgK) Format : 9.6283 h4 (kJ/kg) Format : 5500.95 h5 (kJ/kg) Format : 5372.7 s5 (kJ/kgK) Format : 3.6875 x6 Format : 0.2809 h6 (kJ/kg) Format : 4267.6 Qin (kJ/s) Format : 58694 Qout (kJ/s) Format : 52050 W (MW) Format : 47.9 Efficiency (%) Format : 77.6arrow_forward
- In an ideal Rankine cycle, steam generated at 3.546 Mpa and 450°C. The condenser isat 45°C. Determine (a) the ideal pump work, (b) the cycle efficiency, (c) for an enginewith the same end state, determine the engine efficiency.(Note: Draw the schematic and T-s diagram)arrow_forwardIn a steam power plant operating according to the ideal Rankine cycle at 4MPa pressure and 400CIt enters and condenses in the condenser at a pressure of 100kPa. Determine the efficiency of the cycle.What would the efficiency be if the steam entered the turbine at 5MPa pressure and condensed at 90kPa pressure.arrow_forwardWater is the working fluid in an ideal Rankine cycle. Superheated vapor enters the turbine at 8 MPa, 480 degree Celsius. The condenser pressure is 10 kPa. The cycle is modified to include reheat. In the modified cycle, steam expands through the first-stage turbine to 0.7 MPa and then is reheated to 480 degree Celsius. If the net power output of the modified cycle is 100 MW, determine for the modified cycle (a) the rate of heat transfer to the working fluid passing through the steam generator, in MW, (b) the thermal efficiency, (c) the rate of heat transfer to cooling water passing through the condenser, in MWarrow_forward
- 1. In an ideal reheat-regenerative cycle, steam enters the turbine at 6 MPaa and 400°C. After expansion to 1.4 MPaa steam is withdrawn and reheated to 300°C. Extractions for regenerative heating occur at 0.15 MPaa and 1.4 MPaa and the condenser pressure is 0.01MPaa. Use mass flowrate of 1 kg/s. a. Sketch the schametic diagram showing the correct state points and its components b. Sketch the T-s diagram showing the statesarrow_forwardPlease answer step by steparrow_forwardA steam power plant operates on the simple ideal Rankine cycle. Steam enters the turbine at 4 MPa, 500 degrees celcius and is condensed in the condenser at a temperature of 40 degrees celcius. draw and label the schematic diagram and the pV and TS planes. (a) Show the cycle on a T-s diagram. If the mass flow rate is 10 kg/s, determine (b) the thermal efficiency of the cycle (c) the net power output in MW.arrow_forward
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