is true for first law & second law efficiency (exergetic efficiency), respectively. + x Carnot efficiency and Carnot efficiency To Exergy used Exeryy supplied Desired output and Supplied Input Desired output Exergy lost and Supplied Input Exergy used Entropy generation Energy generation

is true for first law & second law efficiency (exergetic efficiency), respectively. + x Carnot efficiency and Carnot efficiency To Exergy used Exeryy supplied Desired output and Supplied Input Desired output Exergy lost and Supplied Input Exergy used Entropy generation Energy generation

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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An adiabatic turbine operating under stable conditions, steam 30 bar, at 360 ° C with a mass of 0.12 kg / sIt enters with flow rate and exits at 5 bar, 200 ° C. Neglecting the effects of motion and gravitya) the power produced by the turbine b) the exergy loss of the turbine and c) the exergy efficiency of the turbine.Find. (Take T0 = 20 ° ? ?? P0 = 1 ???!)
Why the Engineers are considered the reversible processes is very important to study? P.3 (Application on Thermochemical Data for Q, U, H, C, and C,) Calculate the internal-energy and enthalpy changes that occur when air is changed from an initial state of 277K and 10 bar, where is molar volume is 2.28 m/Kmole, to a final state of 333K and 1 atm. Assume for air that PV/T is a constant and that C, = 21 and C, = 29.3 kJ/kgmole K.
4 An air nozzle has an efficiency of .90 and is adiabatic. air enters at p1=200 kPa, T1=1300 K with negligible velocity. air exits at p2=130 kPa. use dead state variables of T0=293 k and P0= 100 kPa and a variable heat capacity. what is t2 and the rate of exergy destruction?
Q.1 A piston-cylinder device operates 1 kg of fluid at 20 bar pressure. The initial volume is 0.1 (the last digit of your id.no). The fluid is expand reversibly following the process pv¹.3 = constant. at point B the volume becomes 1.5 m³. The fluid is then cooled at a constant temperature. Calculate the work done in the cycle. p (bar) 0.1 last digit of your id. no 0.1 v cu.m Py ¹.3 B 1.5
Steam power plant shown in figure isoperating at steady state with water as the workingfluid. The mass flow rate of the water circulatingthrough the components is 50 kg/s. Determine: d) isentropic pump efficiencye) mass flow rate of the cooling water, in kg/s.f) rates of entropy production, each in kW/K, forthe turbine and steam generator.Include all the relevant governing equations andreferences to the tables you use. Be organize
An irreversible motor operates between reservoirs at Th = 550 K and Tc = 350 K, with an efficiency of 25%. In each cycle heat Qh = 1200 J is extracted from the reservoir at temperature Th, and this heat is added to the working substance in the motor. The heat |Qc| is taken from the motor to the reservoir at temperature Tc.A) Determine the change in entropy of the universe for one cycle of operationB) How much more work could be done by a reversible motor operating between these reservoirs, with the same heat input for each cycle? JustifyC) Show that for each cycle, the amount of work that becomes unavailable due to the irreversibility of the process is equal to TcΔSuniverse
A power cycle operating between two reservoirs receive energy Qh by heat transfer to a cold reservoirs at Th=2000k and rejects energy Qc by heat transfer to a cold reservoir at Tc=400k.For each of the following cases determine whether the cycle operates reversible, irreversible or impossible. SHOW all calculation procedure.( Hint:find maximum thermal efficiency and compare with each system thermal efficiency, system Thermal efficiency =wcycle/Qin) A)find maximum Thermal efficiency (%) of the system. B)Qh=50kj, Wcycle=850kj C)Qh=2000kj, Wcycle=400kj D)Wcycle=150kj, Qc=700kj
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Steam at 44 bar and a dryness fraction, x = 0.9 is throttled to a pressure of 12 bar. Calculate thedifference in power output in kilowatts between the following two expansion processes:a) Steam at the initial pressure of 44 bar and x = 0.9 at State 1 is expanded in a turbine to State 3 at 0.12 bar.b) Steam at the reduced pressure of 12 bar after throttling at State 2 is expanded in another turbine to State 4 at the same exhaust pressure of 0.12 bar.The mass flow rate of steam is 8 kg/sec in both cases and the expansion in both turbines can be assumed to be reversible and adiabatic. Sketch both expansion processes on the same T-s diagram using the respective initial and final state points as described above.Explain the reason for the difference in power output.Calculate the mass flow rate of steam for the turbine operating at the throttled/reduced pressure to generate the same output as the turbine operating at the pressure before throttling.NOTE: You are required to number the state…
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Determine the specific exergy of saturated water vapor at 137 °C, where To = 313K, Po = 101.3kPa. Assume the velocity and elevation is zero with reference to the environment. You must use following tables to solve this problem. (answer to 2 decimal) Saturated water temperature table Sat Liq. Temp., Sat Liq. Sat Liq. Sat Liq. vf uf hf sf °C m3/kg kJ/kg kJ/kg kJ/kg.K 30 0.001004 125.73 125.74 0.4368 35 0.001006 146.63 146.64 0.5051 40 0.001008 167.53 167.53 0.5724 45 0.00101 188.43 188.44 0.6386 Saturated water temperature table Temp., Sat. Vap. Sat. Vap. Sat. Vap. Sat. Vap. hg kJ/kg vg ug sg °C m3/kg kJ/kg kJ/kg.K 125 0.7508 2534.5 2713.5 7.0745 126 0.7358 2535.5 2714.8 7.0649 127 0.7208 2536.5 2716.1 7.0553 128 0.7058 2537.5 2717.4 7.0457 129 0.6908 2538.5 2718.7 7.0361 130 0.6758 2539.5 2720.0 7.0265 131 0.6608 2540.5 2721.4 7.0169 132 0.6458 2541.4 2722.7 7.0073 133 0.6308 2542.4 2724.0 6.9977 134 0.6158 2543.4 2725.3 6.9881 6.9785 135 0.6008 2544.4 2726.6 136 0.5858 2545.4 2727.9…
3.1 For discussion: (a) Is it possible for exergy to be negative? Discuss. (b) Consider an evacuated space with volume V as the system. Eval- uate its exergy and discuss. PH associated with (c) Is it possible for the specific physical exergy e' a stream of matter to be negative? Discuss.