FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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Steam to a turbine at a mass flow rate of 1.4 kg/s, 700 kPa pressure and 400 °C
enters the temperature. Steam at 100 kPa pressure and 1.4 m3/kg specific volume
exits the turbine. Heat transfer from turbine to environment 50 kW, with turbine
Since the boundary temperature between the environment is 70 °C,
a) Find the power produced by the turbine, entropy produced in the turbine and isentropic efficiency of the turbine.
Note: The changes in kinetic and potential energies will be neglected and
T (K) = 273 + °C will be taken.
Steam enters a turbine at 3500 kPa, 500 C and velocity of 300 m/s and exit at 15 kPa and 25 C.
Heat loss is 15 kw. The mass flow rate is 10 kg/s. Find the work output.
(15%) A small expander (a turbine with heat transfer) has 0.05 kg/s helium entering at
1000 kPa, 550 K and leaving at 250 kPa, 300 K. The power output on the shaft measures
55 kW. Find the rate of heat transfer, neglecting kinetic energies.
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