Item 9An open system with only one inlet and one exit operates at steady state. Mass enters the system at a flow rate of 8 kg/s with the following properties: h = 3245 kJ/kg, s = 8.0514 kJ/kg - K, and V = 18 m/s. At the exit the properties are as follows: h = 2139 kJ/kg, s = 8.089 kJ/kg · K, andV = 29 m/s. The device produces 8799 kWshaft work while rejecting some heat to the atmosphere at 30 °C.Part ADo a mass analysis to determine the mass flow rate at the exit.Express your answer to three significant figures.ΑΣφ |vec?SubmitRequest AnswerPart BDo an energy analysis to determine the rate of heat transfer (include sign).Express your answer to three significant figures and include the appropriate units.?ValueUnitsSubmitRequest AnswerPart CDo an entropy analysis to evaluate the rate of entropy generation in the system's universe.Express your answer to three significant figures.ΑΣφ vec?kWK

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Answered: An open system with only one inlet and…

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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A turbine operating under steady flow conditions receives steam at the following state:p1 = 1.5 bar, v1 = 0.038 m3/ kg, C1 = 115 m/s and u1 = 915 kJ/kg and at the exit are p2 =5.5 bar, v2 = 0.18 m3/kg, C2 = 195 m/s and u2 = 715 kJ/kg. During the passage, the fluidrejects 850 kJ/hr heat. If the rate of steam flow is 1368 Kg/hr. Evaluate the powerdeveloped by the turbine in kW.
Ten lbm per min of fluid is handled in a reversible steady flow manner by a thermodynamic system located where the local g = 32 ft/s2. For the liquid, p1 = 20 psia, p2 = 80 psia, ρ1= 1.6 lbm/ft3, ρ2 = 0.32 lbm/ft3, v1 = 400 ft/s, v2 = 600 ft/s, u1 = 130 BTU/lbm, u2 = 130 BTU/lbm. During passage through the system, the fluid rejects 50 BTU/s as heat and rises 175 ft in elevation. What is the change in kinetic energy in BTU? Select one: a. 23.56 b. 29.34 c. 34.56 d. 39.95
Ten lbm per min of fluid is handled in a reversible steady flow manner by a thermodynamic system located where the local g = 32 ft/s2. For the liquid, p1 = 20 psia, p2 = 80 psia, ρ1= 1.6 lbm/ft3, ρ2 = 0.32 lbm/ft3, v1 = 400 ft/s, v2 = 600 ft/s, u1 = 130 BTU/lbm, u2 = 130 BTU/lbm. During passage through the system, the fluid rejects 50 BTU/s as heat and rises 175 ft in elevation. During passage through the system, the fluid rejects 50 Btu/s as heat and rises 175 ft in elevation. Determine the work in the system, in BTU. Select one: a. – 675.2 b. – 781.8 c. 892.6 d. 987.4
Carbon dioxide gas is compressed at steady state from a pressure of 22 lbf/in2 and a temperature of 32oF to a pressure of 50 lbf/in2 and a temperature of 100oF. The gas enters the compressor with a velocity of 30 ft/s and exits with a velocity of 80 ft/s. The mass flow rate is 3000 lb/hr. The magnitude of the heat transfer rate from the compressor to its surroundings is 5% of the compressor power input. Use the ideal gas model with cp = 0.21 Btu/lb·oR and neglect potential energy effects. Determine the flow area at the inlet, in ft2, and the power required by the compressor to work, in horsepower.
Carbon dioxide gas is compressed at steady state from a pressure of 22 lbf/in2 and a temperature of 32oF to a pressure of 50 lbf/in2 and a temperature of 110oF. The gas enters the compressor with a velocity of 30 ft/s and exits with a velocity of 80 ft/s. The mass flow rate is 4000 lb/hr. The magnitude of the heat transfer rate from the compressor to its surroundings is 5% of the compressor power input. Use the ideal gas model with cp = 0.21 Btu/lb·oR and neglect potential energy effects.
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?
Air enters a compressor operating at steady state at 14 lbf/in2, 60°F, with a volumetric flow rate of 5600 ft3/min. The compression occurs in two stages, with each stage being a polytropic process with n = 1.27. The air is cooled to 80°F between the stages by an intercooler operating at 45 lbf/in2. Air exits the compressor at 150 lbf/in2. 1. Determine the magnitude of the total power required by the compressor, in Btu/min. 2. Determine the magnitude of the total heat transfer rate for both compressor stages, in Btu/min. 3. Determine the magnitude of the heat transfer rate from the intercooler, in Btu/min.
A working substance enters a thermodynamic steady flow system with the following conditions:P1 = 20 Psia; v1 = 11.7 ft3, u1=101.6 Btu/lb, V1=150 ft/sec. The working substance leaves the system with the following conditions: p2=25 psia, v2 = 10.3 ft3/lb u=149.0 Btu/lb and V2 = 500 ft/sec. Changes through the system are negligible and 10 Btu/lb transferred head is added to the fluid as it passes through the system. Determine the work done on or by the fluid in Btu/lb.
Refrigerant 134a enters an air conditioner compressor at 4 bar, 20 degrees celsius, and is compressed at steady state to 12 bar, 80 degrees celsius. The volumetric flow rate of the refrigerant entering is 5m3/min. The work input to the compressor is 75 KJ per kg of refrigerant flowing. Neglecting kinetic and potential energy effects, determine the magnitude of the heat transfer rate from the compressor, in KW.
Water is compressed adiabatically, but inefficiently, from p1 = 150 kPa and T1 = 160 ∘C to a pressureof p2 = 700 kPa. A throttle valve is connected to the outlet of the compressor and has a temperature reading atits outlet of T3 = 440 ∘C at atmospheric pressure (1 bar). If the compressor operates at steady state, stray heattransfer can be neglected, and the changes in kinetic and potential energy are negligible, determine the isentropicefficiency of the compressor, in percent.
At steady state, Refrigerant 22 enters (1) the compressor at 40C, 5.5bar and is compressed to 60C, 13.8bar. R-22 exiting (2) the compressor enters a heat exchanger where energy transfer to air as a separate stream occurs and the refrigerant exits (3) as a liquid at 13.5bar, 32C. Air enters (4) the condenser at 27C, 1.0bar with a volumetric flow rate of 21.2m3/min and exits (5) at 43C. Assuming ideal gas behavior for the air and stray heat transfer and kinetic and potential energy effects are negligible, determine the compressor power
Assume 9.84 lb/sec of fluid enter a steady-state, steady-flow system with P₁ = 107.18 psia, p₁ = 0.379 lb/ft³, u₁ = 94.7 fps, u₁ = 793.87 BTU/lb, and leave with P2 = 28.47 psia, p2 = 0.122 lb/ft³, u2 = 450.93 fps, and u2 = 750.79 BTU/lb. During the passage through the open system, each pound rejects 10.6 BTU of heat. Determine the work in hp.

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