A steady-state system for producing power consist of a pump, heat exchanger and a turbine. Waterat 1.0 bar and 20°C (state 1) enters the adiabatic pump and leaves at 10 bar (state 2). The pumpdraws 110 kW of power, and the mass flow rate of water is 45 kg/s. The water leaving the pumpenters a heat exchanger and heated at constant pressure to 400°C (state 3) using exhaust gases (Cpof gases = 1.1 kJ/kgK) that enters at 500°C and exits at 182°C. The steam is adiabatically expandedin a turbine having an isentropic efficiency of 0.71. The turbine exhausts (state 4) to thesurroundings at 1.0 bar.What is total rate of entropy production resulting from this power production process?What is thermal efficiency of this power production process?

To find: The rate of entropy production and thermal efficiency. Given: The pressure at the pump…

Answered: A steady-state system for producing…

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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3) A three-process cycle uses 3 kg of air and undergoes the following processes: polytropic compression from state 1 to state 2, where 150 kPa, 3600K, 750 kPa, and n=1.2; constant-pressure cooling from state 2 to state 3; and constant-temperature heating from state 3 to state 1, thus completing the cycle. Sketch the cycle on a p-V and T-s diagrams and determine the total heat and net work of the cycle.
Gaseous nitrogen actuates a Carnot power cycle in which the respective volumes at the four corners of the cycle starting at the beginning of the isothermal expansion are, V1 = 10.10 li, V2 = 14.53 li, V3 = 226.54 li, and V4 = 157.73 li. The cycle receives 21.5 kJ of heat. Determine (a) the net work, (b) the mean effective pressure, and (c) the thermal efficiency of the cycle.
Gaseous Methane actuates a Carnot power cycle in which the respective volumes at the four corners of the cycle,starting at the beginning of the isothermal expansion, are V1 = 10.10 L, V2 = 14.53 L, V3 = 226.54 L, and V4 157.73L. The cycle receives 21.1 kJ of heat. Determine a) the work and b) the mean effective pressure.
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
Steam enters a well-insulated turbine operating at steady state at 4 MPa with a specific enthalpy of 3015.4 kJ/kg and a velocity of 10 m/s. The steam expands to the turbine exit where the pressure is 0.07 MPa, specific enthalpy is 2500 kJ/kg, and the velocity is 90 m/s. The mass flow rate is 30 kg/s.Neglecting potential energy effects, determine the power developed by the turbine, in kW.
3. Gaseous nitrogen actuates a Carnot power cycle in which the respective volumes at the four corners of the cycle, starting at the beginning of the isothermal expansion ,are V1 = 10.10, V2 = 14.53, V3 = 226.54 ,and V4 = 157.73L. The cycle receives 21.1 KJ of heat. Determine a) the work and b) the mean effective pressure.
A well insulated turbine operates at steady state. Steam enters the turbine at 4 MPa with a specific enthalpy of 3015.4 kJ/kg and a velocity of 10 m/s. The steam expands to the turbine exit where the pressure is 0.07 MPa, specific enthalpy is 2431.7 kJ/kg, and the velocity is 90 m/s. The mass flow rate is 11.95 kg/s. Neglecting potential energy effects, determine the power developed by the turbine, in kW.
Steam enters the first stage of the turbine illustrated in the Figure below at 40 bar and 500 ºC with a volumetric flow rate of 90 m3/min. The steam leaves the turbine at 20 bar and 400 ºC. The steam is then reheated to a constant temperature of 500 ºC before entering the second stage of the turbine. The steam leaves the second stage as saturated steam at 0.6 bar. For a steady state operation and ignoring heat losses and the effects of kinetic and potential energy, determine:a) The mass flow of steam.b) The Power produced by turbine 1.c) The power produced by the turbine 2.d) The rate of heat transfer to the heater.
A reversible cycle receives 40 kJ of heat from one heat source at a temperature of 127 ℃ and 37 kJ from another heat source at 97 ℃. The heat rejected (in kJ) to the heat sink at 47 ℃ is. A. 36 B. 49 C. 64 D. 81
In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22°C. The refrigerant enters the condenser at 16 bar and 190°C, and saturated liquid exits at 16 bar. There is no significant heat transfer between the compressor and its surroundings, and the refrigerant passes through the evaporator with a negligible change in pressure.If the refrigerating capacity is 50 kW, determine:(a) the mass flow rate of the refrigerant, in kg/s.(b) the power input to the compressor, in kW.(c) the coefficient of performance.(d) the isentropic compressor efficiency, in percent.(e) the rate of entropy production, in kW/K, for the compressor.
.......A gas turbine power plant is operated between 1.5 bar and 15 bar with minimum and maximum cycle temperatures of 25 C and 1420 C, respectively. Neglect the mass of the fuel. Determine the following: Work of the compressor in kJ/kg (2 decimal places) = Work of the gas turbine in kJ/kg (2 decimal places) = Heat added in the combustion chamber in kJ/kg (2 decimal places) = Net Work in kJ/kg (2 decimal places) = Thermal Efficiency in % (1 decimal place only) =
A turbine operating under steady-flow conditions receives steam at the following state: pressure, 13.8 bar; specific volume 0143 m3/kg, and velocity 30 m/s. The state of the steam leaving the turbine is as follows: pressure 0.35 bar, specific volume 4.37 m3/kg, and velocity 90 m/s. The difference in elevation is negligible. Heat is rejected to the surroundings at the rate of 0.25 kW, the turbine develops 103 kW of power and the rate of steam flow through the turbine is 0.5 kg/s. Calculate the change in internal energy of the steam

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