A power cycle operating at steady state receives energy by heat transfer at a rate QH at TH = 1800 K and rejects energy by heattransfer to a cold reservoir at a rate Qc at Tc = 600 K. For each of the following cases, determine whether the cycle operatesreversibly, operates irreversibly, or is impossible.(a) Qu(300) kW, Oc = (100) kW(b) QH(500)kW, Wcycle =(150)kW, Oc = (200)kW(c) Wcycle(450)kW, Oc= (150)kW(d) QH = (500)kW, Oc = (100)kW

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Answered: A power cycle operating at steady state…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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2. A power cycle receives energy QH by heat transfer from a hot reservoir at TH = 1200 R and rejects energy QC by heat transfer to a cold reservoir at TC = 400 R. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH = 900 Btu, Wcycle = 450 Btu (b) QH = 900 Btu, QC = 300 Btu (c) Wcycle = 600 Btu, QC = 400 Btu (d) Eff. = 70%
Three return steam lines in a chemical processing plant enter a collection tank operating at steady state at 9 bar. Steam enters inlet 1 with flow rate of 2 kg/s and quality of 0.9. Steam enters inlet 2 with flow rate of 2 kg/s at 200°C. Steam enters inlet 3 with flow rate of 1.2 kg/s at 95°C. Steam exits the tank at 9 bar. The rate of heat transfer from the collection tank is 40 kW.Neglecting kinetic and potential energy effects, determine for the steam exiting the tank:(a) the mass flow rate, in kg/s.(b) the temperature, in °C.
At steady state, a power cycle develops a net power output of 20kW while receiving energy by heat transfer at a rate of 20kJ per cycle of operation from a source at a temperature T. The cycle rejects energy by heat transfer to cooling water at a lower temperature of 540 K. If there are 190 (engine thermodynamic) cycles per minute, what is the minimum theoretical value for T, in K?Note: mm is the last
At steady state, a refrigeration cycle operating between hot and cold reservoirs at 300 K and 235 K, respectively, removes energy by heat transfer from the cold reservoir at a rate of 1000 kW.(a) If the cycle’s coefficient of performance is 4, determine the power input required, in kW.(b) Determine the minimum theoretical power required, in kW, for any such cycle
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
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.
Energy Balance in an Open System Steam flows at steady state through a converging, insulated nozzle, 35 cm long and with an inlet diameter of 2.5 cm. At the nozzle entrance (state 1), the temperature and pressure are 250 °C and 1000 kPa, and the velocity is 20 m/s. At the nozzle exit (state 2), the steam temperature and pressure are 700 °C and 400 kPa. Property values are H1 = 2942.59 kJ/kg H2 = 3926.53 kJ/kg V1 = 0.23268 m3/kg V2 = 1.12147 m3/kg What is the velocity of the steam at the nozzle exit, and what is the exit diameter?
A system undergoes a power cycle while receiving 1450 kJ by heat transfer from a thermal reservoir at a the temperature of 780 K and discharging 560 kJ by heat transfer to a thermal reservoir at (a) 250 K, (b) 380 K, (c) 460 K. For each case, determine whether the cycle operates irreversibly, operates reversibly, or is impossible.
At steady state, a refrigeration cycle removes 800 kJ/min of energy by heat transfer from acold space maintained at -15o C and discharges energy by heat transfer to its surroundings at20o C. If the coefficient of performance of the actual cycle is 80 percent of that of areversible refrigeration cycle (ideal) operating between thermal reservoirs at these twotemperatures (β = 0.80 βmax), determine:a) Coefficient of performance;b) Power input to the cycle, in kW;c) Heat rejected to the surroundings.Draw sketch and show all calculations.
A power washer is being used to clean the siding of a house. Water enters at 20 ◦C (specific volume = 1.0018×10−3 m3/kg), 1 atm, with a volumetric flow rate of 0.1 L/s through a 2.5 cm diameter hose. A jet water exits at 23 ◦C, 1 atm, with a velocity of 50 m/s at an elevation of 10 m. At steady state, the magnitude of the heat transfer rate from the power unit to the surroundings is 10% of the power input. The water can be considered incompressible with specific heat equal to 4.18 kJ/kg · K and g = 9.81 m/s2. What is the power input to the motor in kW?
The displacement volume of an internal combustion engine is 2.15 liters. The processes within each cylinder of the engine are modeled as an air-standard Diesel cycle with a cutoff ratio of 2.5. The state of the air at the beginning of compression is fixed by p1 = 1.6 bar, T1 = 325 K and V1 = 2.36 liters. If the cycle is executed 2100 times per min, determine:d) the power developed by the engine, in kW,e) and the thermal efficiency.
Steam enters a turbine with a pressure of 80 bar, a temperature of 480°C, and a velocity of 145 m/s. Saturated vapor at 120°C exits with a velocity of 87 m/s. At steady state, the turbine develops work equal to 610 kJ per kg of steam flowing through the turbine. Heat transfer between the turbine and its surroundings occurs at an average outer surface temperature of 350 K. Determine the rate at which entropy is produced within the turbine per kg of steam flowing, in kJ/kg K. Neglect the change in potential energy between inlet and exit. Select one:a. 0.28b. 0.36c. 0.43d. 0.50

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