A steam turbine produces 1000 hp at its shaft output. Superheated steam enters the turbine through a 3-inch ID pipe at a temperature T1 = 1200°F, a pressure of P1 = 380 psia, a specific enthalpy of hi = 1631.6 Btu/lbm, and a velocity of vI = 100 ft/s. The superheated steam leaves the turbine at a specific enthalpy of h2 = 1238.1 Btu/lbm and a velocity of v2 = 300 ft/s. The discharge line is 10 ft below the entrance line. Assume that the turbine operates adiabatically and steam behaves as an ideal gas. Determine the power lost to friction in the bearings of the turbine. %D

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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A steam turbine produces 1000 hp at its shaft output. Superheated steam enters the turbine
through a 3-inch ID pipe at a temperature T1 = 1200°F, a pressure of P1 = 380 psia, a specific
enthalpy of hi = 1631.6 Btu/lbm, and a velocity of vI = 100 ft/s. The superheated steam leaves
the turbine at a specific enthalpy of h2 = 1238.1 Btu/lbm and a velocity of v2 = 300 ft/s. The
discharge line is 10 ft below the entrance line. Assume that the turbine operates adiabatically
and steam behaves as an ideal gas. Determine the power lost to friction in the bearings of the
turbine.
%D
Transcribed Image Text:A steam turbine produces 1000 hp at its shaft output. Superheated steam enters the turbine through a 3-inch ID pipe at a temperature T1 = 1200°F, a pressure of P1 = 380 psia, a specific enthalpy of hi = 1631.6 Btu/lbm, and a velocity of vI = 100 ft/s. The superheated steam leaves the turbine at a specific enthalpy of h2 = 1238.1 Btu/lbm and a velocity of v2 = 300 ft/s. The discharge line is 10 ft below the entrance line. Assume that the turbine operates adiabatically and steam behaves as an ideal gas. Determine the power lost to friction in the bearings of the turbine. %D
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A pipeline laid cross country carries oil at the rate of Q = 795 m3
/d. The pressure of the oil is
P1 = 1793 kPa gage leaving pumping station 1. The pressure is P2 = 862 kPa gage at the inlet
to the next pumping station, 2. The second station is 17.4 m higher than the first station.
Calculate the frictional loss (ghL ) in J/kg. The oil density is ρ = 769 kg/m3
.

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