FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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6. Initial condition: P = 8 MPa
x = 100 %
m = 5 kg
Process: Isothermal
Final condition: Q in KJ = 75 % of initial enthalpy
Required: Work
find the second law efficiency of the steam turbine operating steadily at initial pressure of 3 MP and initial temperature of 450 degrees celsius the final condition of steam at 0.2 mpa and 200 degree Celsius neglect the Kinetic and potential energy changes the heat loss for the steam turbine to the surrounding is to 50 kW assume the mass flow rate of steam is 7 kg/s
Air is heated at constant pressure from 2 7
degrees C to 57 degrees C at 3 bar in a
heater from an infinite heat source at
temperature 227 degrees C Find the gain
in availability of air and the effectiveness
of the heater. Assume To = 280K and
Cp =1.0 kj/kgK.
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- John decides to make ice using a Carnot refrigerator that takes heat from water at 0°C to a room at 30°C. Suppose 200 g of water at 0°C are converted to ice at 0°C by the refrigerator. Calculate the mechanical energy that must be applied to the refrigerator in J. The latent heat of fusion of water is Lf-3.34x105 J/kg. Remember the definition of the coefficient of performance K and first calculate K.arrow_forwardPlease show the complete solution.arrow_forward8arrow_forward
- 1 kg of steam at initial conditions of 5.1 MPa and 370 °C expands in a turbine until it becomes saturated. It is withdrawn and reheated to 340°C. After further expansion in the turbine to 160 , part of the steam is extracted for feedwater heating. The remaining steam expands to the condenser pressure of 0.018 MPa. find Wnet, Ec, Ee and the ideal steam rate. Remember, 1. For values taken from the steam tables: Use them as is, do not round off. 2. For values obtained by interpolation and final answers obtained by solving, use FOUR (4) decimal places. 3. PLEASE USE THE STEAM TABLE PROVIDED: https://drive.google.com/drive/folders/15t3WMv7xSTHmwXWXp0X2ZV6aYWhXuRCS?usp=sharingarrow_forward200Kg/min superheated steam at 40 bar and 350C enters a turbine through a 7.5cm ID pipe. It exits at 5bar as saturated steam through a 5cm ID pipe neglect the change in potential energy of the system. What is the temperature of the outlet saturated system? How much energy is transferred to or from the turbine?arrow_forwardComplete Solutionsarrow_forward
- Q1/ Find the equation for the work of a reversible, isothermal compression of 1 mol of gas in a pistonlcylinder assembly if the molar volume of the gas is given by RT V =arrow_forward.The thermal efficiency of a heat engine is 30%, the heat rejected from the engine is 30kJ, evaluate the heat input to the engine.arrow_forward3.0 A cold storage is to be maintained at -5°C while the surroundings are at 35°C. The heat leakage from the surroundings into the cold storage is estimated to be 28 kW. The actual C.O.P. of the refrigeration plant used is one fourth that of an ideal plant working between the same temperatures. Find the power required to drive the plant.arrow_forward
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