A fluid expands reversibly according to a linear law from 3.8 bar to 1.1 bar, the initial volume is 0.006 mº. The fluid is then cooled reversibly at constant pressure, and finally compressed reversibly according to a law pv =constant back to the initial conditions of 3.8 bar and 0.006 m. Calculate the net work of the cycle if the work done during the constant pressure cooling is given by 5930 N.m. Sketch the cycle on a p-v diagram.

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Answered: A fluid expands reversibly according to…

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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Two reversible cycles are in series, each process doing the same net work, Wcycle. The first cycle receives energy QH by heat transfer from a hot reservoir at 1000°R and energy Q is reinjected by heat transfer to a reservoir at an intermediate temperature, T. The second cycle receives energy Q by heat transfer from the reservoir at temperature T and reinjects the QC energy by heat transfer to the reservoir at a temperature of 400°R. All energy transferred is positive in the direction of the arrow. Determine: a) the intermediate temperature T, in °R, and the thermal efficiency for each of the two cycles; b) the thermal efficiency of a simple reversible cycle operating between the hot and cold reservoirs at 1000°R and 400°C, respectively. Then determine the net work done by the simple cycle, expressed in terms of the net work done by each of the two cycles, Wcycle.
A steam turbine seems to operate at a mass flow rate of 1.5 kg / hr. Turbine inlet state P1 = 2 MPa, T1 = 400C and V1 = 60 m / s; the output state is P2 = 0.1 MPa, x2 = 0.97 and V2 = 150 m / s. Difference in height between turbine outlet 1 m. The heat loss from the turbine is given as 50 kW. a) Determine the production power from the turbine. b) Turbine power neglecting Kinetic and Potential energy changes calculation. Interpret these two results. c) Turbine spring and cross section areas, as well as steam pipe diameters calculation. d) If the ambient temperature is 27C, what is the entropy generation in the turbine?
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A Steam turbine operates under steady flow conditions receiving steam at the following state: Pressure 15 bar, internal energy 2700kj/kg; specific volume 0.17m3/kg and velocity 100m/sec. The exhaust steam from the turbine is at 0.1 bar with internal energy 2175kj/kg. specific volume 15m³/kg and velocity 300m/sec. The intake is 3m above the exhaust. The turbine develops 35KW and the heat lost over the surface of the turbine is 20kj/kg. Determine the steam flow rate through the turbine
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An ideal gas passes a diffuser. At the diffuser inlet, the temperature is T1 = 350.00 K, the pressure P1 = 100.00 kPa, the velocity V1 = 200.00 m/s, and the inlet area A1 = 0.30 m2. At the exit, the velocity is very small. The specific heat of the ideal gas at the constant pressure is cp = 1.0050 kJ/(kg·K). The gas constant is R = 0.2870 kPa·m3/(kg·K). Determine the temperature at the exit, T2__________(K)
A steam turbine is designed to operate at a mass flow of 1.5 kg/s. Inlet state to the turbine P1=2 MPa, T1=400 C and V1=60 m/s; the output state is P2=0.1MPa, x2=0.97 and V2=150 m/s. The height difference between the turbine inlet and outlet is 1 m. The heat loss from the turbine is given as 50 kW. a) Determine the power generated from the turbine. b) Calculate the turbine power by neglecting the Kinetic and Potential energy changes. Comment these two results. c) Calculate the turbine inlet and outlet cross-sectional areas and steam pipe diameters. d) If the ambient temperature is 27 C, what is the entropy generation in the turbine?
As shown in the figure below, two reversible cycles arranged in series each produce the same net work, Wcycle. The first cycle receives energy QH by heat transfer from a hot reservoir at TH = 1500°R and rejects energy Q by heat transfer to a reservoir at an intermediate temperature, T. The second cycle receives energy Q by heat transfer from the reservoir at temperature T and rejects energy QC by heat transfer to a reservoir at TC = 450°R. All energy transfers are positive in the directions of the arrows. Determine:(a) the intermediate temperature T, in °R, and the thermal efficiency for each of the two power cycles.(b) the thermal efficiency of a single reversible power cycle operating between hot and cold reservoirs at 1500°R and 450°R, respectively. Also, determine the ratio of the net work developed by the single cycle to the net work developed by each of the two cycles, Wcycle.
No entropy accompanies work as it crosses the system boundary. But entropy may be generated within the system as work is dissipated into a less useful form of energy.

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