8.1 (20%)1 kg of working fluid is expanded isothermally and reversibly in a closed piston-cylinder system from 3MPa and 300°C to 0.1 MPa.Calculate the heat (in kJ) and work (in kJ) transferred in the process, and draw a T-s diagram of the process.a) When the working fluid is air.b) When the working fluid is steam.

Step 1:vWorking Fluid is AirGiven data for air:Initial pressure, P1=3 MPaInitial temperature,…

Answered: 8.1 (20%) 1 kg of working fluid is…

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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You work in a company in the energy sector. The competition announces a new turbine that can operate at low temperatures thanks to the use of R134a as the working fluid. According to the competition, this adiabatic turbine has the characteristics shown in the figure below when operating in steady state. (a) How much Power would this turbine generate? (b) Is it possible that it operates as the competition says? Turbina = turbine
The first step of a thermodynamic cycle is an isobaric process with increasing volume. The second is an isochoric process, with decreasing pressure. The last step may be either an isothermal or adiabatic process, ending at the starting point of the isobaric process. Sketch a graph of these two possibilities, and comment on which will have greater net work per cycle.
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Only answer part2.
Q1. Heat engines convert internal energy to mechanical energy. Describe the operation of this reversible engine on a PV diagram and show how to determine the efficiency of the cycle.
Air within a piston-cylinder assembly executes a Carnot heat pump cycle, as shown in the figure below. For the cycle, TH = 600 K and Tc = 300 K. The energy rejected by heat transfer at 600 K has a magnitude of 1000 kJ per kg of air. The pressure at the start of the isothermal expansion is 325 kPa. p-v diagram for a Carnot gas refrigeration or heat pump cycle. Assuming the ideal gas model for the air, determine: (a) the magnitude of the net work input, in kJ per kg of air, and (b) the pressure at the end of the isothermal expansion, in kPa.
1. An engine with a cylinder volume of 250 cc and a volume at top dead centre of 25 cc uses a thermal cycle where the initial stage is an isentropic adiabatic compression process with the equation pvY = C. It is known that the initial conditions are 1 bar and 30°C. After that, a combustion process takes place in which heat is supplied at a constant volume. The heat given is 80 KJ/kg and if the specific heat at constant volume is known to be 0.718 kJ/kg K, determine the maximum temperature and pressure that occur? 2. Air with a mass of 3 kg is heated at constant volume from 25°C to 120°C. The process then takes place at constant pressure so that the gas has a temperature of 550°C. Determine the heat required and the entropy change that occurs during the process? (Air: Cp = 1.005 kJ/kg.K and y = 1.4; and assume Cp does not change with temperature). Known that initial volume is 50 ml and the last volume is 300 ml.
A small turbine operates using hydrogen gas, initially at 0.523 MPa and 480 K. The expansion pressure ratio is 5.23:1. a) If the isentropic efficiency of the turbine is 80%, calculate the actual work output of the turbine, in kJ/kg. b) What is the temperature of the hydrogen at the outlet of the turbine?
Air within a piston-cylinder assembly executes a Carnot heat pump cycle, as shown in the figure below. For the cycle, TH = 400 K and Tc = 300 K. The energy rejected by heat transfer at 400 K has a magnitude of 625 kJ per kg of air. The pressure at the start of the isothermal expansion is 325 kPa. TH Te p-v diagram for a Carnot gas refrigeration or heat pump cycle. Assuming the ideal gas model for the air, determine: (a) the magnitude of the net work input, in kJ per kg of air, and (b) the pressure at the end of the isothermal expansion, in kPa.
Carnot heat engine which produces 10 kJ of work for one cycle has a thermal efficiency of 50 percent. The working fluid is 0.50 kg of air, and the pressure and volume at the beginning of the isothermal expansion are 7 bars and 0.119 m3, respectively. Find a. the maximum and minimum temperatures for the cycle, in degrees Kelvin,  b. the net work , and c. the volume at the end of the isothermal expansion process , in m3.
Please answer D and E thank you
a. Sketch the process on a P-V diagram b. Determine the rate of heat transfer from Boiler ( Qcv/m 1-2, in KJ/kg) c. Determine the rate of heat transfer from condenser ( Qcv/m 3-4, in KJ/Kg) d. Using the Clausius inequality to determine if the cycle is internally reversible, irreversible, or impossible. e. Determine the thermal efficiency of power cycle f. Determine the maximum thermal efficiency of power cycle ( Carnot Efficiency) g. Due to part (e & g) this cycle is___________ ? - internally reversible -internally irreversible -impossible

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