Consider the combined gas-steam power cycle. The topping cycle is a gas-turbine cycle that has a pressureratio of 8. Air enters the compressor at 300 K and the turbine at 1300 K. The isentropic efficiency of thecompressor is 80%, and that of the gas turbine is 85%. The bottoming cycle is a simple Rankine cycleoperating between the pressure limits of 7 MPa and 5 kPa. Steam is heated in a heat exchanger by theexhaust gases to a temperature of 500°C and the isentropic efficiency of the turbine is 90 %. The exhaustgases leave the heat exchanger at 450 K. Considering the mass flow rate steam as 1 kg/s, determine:A) Net power, B) Total input heat, C) Total entropy generation, D) Energy efficiency, E) Exergy efficiency,F) T-s diagramSolve by EESCompressorAir -③inExhaustgasesPumpCombustionchamberGasturbineGas cycleHeat exchangerCondenserSteamSteamturbinecycle

Answered: Consider the combined gas-steam power…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The net work output and the thermal efficiency for the Carnot and the simple ideal Rankine cycles with steam as the working fluid are to be calculated and compared. Steam enters the turbine in both cases at 5 MPa as a saturated vapor, and the condenser pressure is 50 kPa. In the Rankine cycle, the condenser exit state is saturated liquid and in the Carnot cycle, the boiler inlet state is saturated liquid. Draw the T-s diagrams for both cycles.
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6. An ideal Rankine cycle operates between a boiler pressure of 4 Mpa and a condenser pressure of 10 kpa. The exit steam from the turbine should have a quality of 96% and the power output of the turbine should be 80MW. Determine 8. The minimum boiler exit temperature The efficiency of the cycle The mass flow rate of steam a. b. C.
Example: Consider the combined gas-steam power cycle. The topping cycle is a gas-turbine cycle that has a pressure ratio of 8. Air enters the compressor at 300 K and the turbine at 1300 K. The isentropic efficiency of the compressor is 80 percent, and that of the gas turbine is 85 percent. The bottoming cycle is a simple ideal Rankine cycle operating between the pressure limits of 7 MPa and 5 kPa. Steam is heated in a heat exchanger by the exhaust gases to a temperature of 500°C. The exhaust gases leave the heat exchanger at 450 K. Lec. (7) T, KA Determine (a) the ratio of the mass flow rates of the steam and the combustion gases and (b) the thermal efficiency of the combined cycle. 1300 450 300 5' 7 MPa Power Plant 5 kPa 500°C 7 MPa Dr. Omar M. Ali 4
4. Consider a simple ideal Rankine cycle. The pressure of the boiler and the condenser are 3 Mpa and 10 kPa respectively. The temperature of the steam entering the turbine is 350°C, and the quality of mixture leaving the turbine is 0.8. Calculate the back work ratio, in %. 0.4% - 0.5% · 0.3 % - 0.6%
A simple ideal Rankine cycle with water as the working fluid operates between the pressure limits of 3 MPa in the boiler and 30 kPa in the condenser. If the quality at the exit of the turbine cannot be less than 80 percent, what is the maximum thermal efficiency this cycle can have? Use steam tables. The maximum thermal efficiency is %.
Consider a simple Brayton cycle using air asthe working fluid; has a pressure ratio of 12; has amaximum cycle temperature of 600C; and operates thecompressor inlet at 100 kPa and 15C. Which will have the greatest impact on the back-work ratio: a compressorisentropic efficiency of 80 percent or a turbine isentropicefficiency of 80 percent? Use constant specific heats atroom temperature.
An ideal ericsson cycle with air as the working fluid in a steady-flow system is at 27C and 120kPa at the beginning of the isothermal compression process, during which 150 kJ/kg of heat is rejected. Heat transfer to air occurs at 1200K. What is the maximum pressure in the cycle, the net work output per unit mass of air and the thermal efficiency of the cycle
In 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 engine at 540°C. Expansion now occurs to the condenser pressure of 0.0035 Mpa. (a) For the ideal cycle, find ee (b) A 60,000 kW turbine operates between the same state points except that the steam enters the reheater at 1.95Mpa 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, ek, mk, and nk, (c) Determine the approximate enthalpy of the exhaust steam if the heat lost through the turbine casing is 2% of the combined work.4. Steam at 200 bar, 760°C enters the thrott
An ideal reheat Rankine cycle with water as the working fluid operatesthe boiler at 15,500 kPa, the reheater at 2000 kPa, and the condenser at 100 kPa. The temperature is 450°C at the entrance of the high-pressure and low-pressure turbines. The mass flow rate through the cycle is 1.74 kg/s. Determine the power used by pumps, the power produced by the cycle, the rate of heat transfer in the reheater, and the thermal efficiency of this system.
3 (a) A simple Rankine cycle uses water as the working fluid (Figure Q3). IA 9 in 4s 4 gout Figure Q3. Rankine Cycle The boiler operates at 7,000 kPa and the condenser at 100 kPa. At the entrance to the turbine, the temperature is 450 °C. The isentropic efficiency of the turbine is 90%, pressure and pump losses are negligible, and the water leaving the condenser is subcooled by 9.6 °C. The boiler is sized for a mass flow rate of 20 kg/s. Determine, (i) The rate at which heat is added in the boiler, (ii) The power required to operate the pumps, (iii) The net power produced by the cycle, (iv) The thermal efficiency. (b) After a long walk in the 14 °C outdoors, a person wearing glasses enters a room at 25°C and 60% relative humidity. (i) What is the difference between specific and relative humidity? (ii) Please explain whether the glasses will become fogged or not and why. An
A combined gas-steam power cycle uses a simple gas turbine for the topping cycle and simple Rankine cycle for the bottoming cycle, Atmospheric air enters the gas turbine at 101 kPa and 20°C, and the maximum gas cycle temperature is 1100°C. The compressor pressure ratio is 8, the compressor isentropic efficiency is 85 percent, and the gas turbine isentropic efficiency is 90 percent. The gas stream leaves the heat exchanger at the saturation temperature of the steam flowing through the heat exchanger. Steam flows through the heat exchanger with a pressure of 6000 kPa and leaves at 320°C. The steam-cycle condenser operates at 20 kPa, and the isentropic efficiency of the steam turbine is 90 percent. Determine the mass flow rate of air through the air compressor required for this system to produce 110 MW of power. Use constant specific heats for air at room temperature. Use steam tables and the table containing the ideal-gas specific heats of various common gases. The required mass flow…

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