Question

Consider now a turbine**(Q=0)** that operates with
N2 steam with T1 = 753.15K and P1 = 6 bar and P2 = 1 bar. The
efficiency is 80% and the molar flowrate is (note not mass flow
rate) is 200 mol/s. The inlet velocity is 30 m/s and the exit
velocity is 120 m/s. The inlet is 6 m above the base of the turbine
and the exit is 2 m above the base.

a. Determine the output of the turbine with units.

b. what is the exhaust temperature and quality (if saturated) for 100% efficiency?

c. What is the output temperature and quality (if saturated) for the given(80%) efficiency?

d. What are the enthalpy and entropy for the 80% efficiency of the turbine?

Answer #1

A steam turbine has inlet steam pressure p1 = 1.4 MPa
absolute. Inlet steam temperature is T1 = 400
oC. This corresponds to inlet enthalpy per unit mass of
h1 = 3121 kJ/kg. Exit pressure of the steam is p2 = 101
kPa absolute. Exit steam temperature is T2 = 100
oC. This corresponds to exit enthalpy per unit mass of
h2 = 2676 kJ/kg. Inlet speed of the steam is
V1 = 15 m/s and exit speed is V2...

13) A turbine, operating under steady-flow
conditions, receives 5000 kg of steam per hour. The steam enters
the turbine at a velocity of 3000 m/min, an elevation of 5 m and a
specific enthalpy of 2787 kJ/kg. It leaves the turbine at a
velocity of 6000 m/min, an elevation of 1 m and a specific enthalpy
of 2259 kJ/kg. Heat losses from the turbine to the surroundings
amount to 16736 kJ/h. Determine the power output of the
turbine.
14) 12 kg...

P2) Steam flows steadily through an adiabatic turbine in a power
plant. The inlet conditions of the steam are 6 MPa, 400 °C and 119
cm2 . The exit conditions are 40 kPa, 92 percent quality, 50 m/s
and 20 kg/s. Determine the power output.

Air enters the compressor of a simple gas turbine at
p1 = 14 lbf/in2, T1 = 520°R. The
isentropic efficiencies of the compressor and turbine are 83 and
87%, respectively. The compressor pressure ratio is 16 and the
temperature at the turbine inlet is 2500°R. The volumetric flow
rate of the air entering the compressor is 9000 ft3/min.
Use an air-standard analysis.
Determine all temperatures at each state.
A) Determine the net power developed, in Btu/h. (Already did
this part,...

Steam enters an adiabatic turbine at 7 MPa, 700 °C and
80 m/s and leaves at 50 kPa, 150 °C, and 140 m/s. If the power
output of the turbine is 6 MW, determine:
i) Mass
flowrate of the steam flowing through the
turbine.
ii) The
isentropic efficiency of the turbine.

A horizontal steady-state turbine is being designed to serve as
an energy source for a small electrical generator. (assume its
adiabatic and frictionless) The power required from the turbine is
1037 kW. The inlet to the turbine is steam at T1 = 600 0 C and P1 =
10 bar, with a mass flow rate of 2.5 kg/s. The inlet pipe is 10 cm
in diameter. The conditions at the turbine exit are T2 = 400 0 C
and P2...

Steam at 4.5 MPa and 500 C enters the turbine with a velocity of
60 m/s and its mass flow rate is 5,000 kg/h. The steam leaves the
turbine at a point 3m below the turbine inlet with a velocity of
350 m/s. The heat loss from the turbine is 100,000 kJ/hr and the
shaft work produced is 950hp. A small portion of the exhaust steam
from the turbine is passed through a throttling valve and
discharges at atmospheric pressure....

Consider a combined gas-steam power cycle. The topping cycle is
a simple Brayton cycle that has a pressure ratio of 7. Air enters
the compressor at 15 ºC at a rate of 10 kg/s and the gas turbine at
950 ºC. The bottoming cycle is a reheat Rankine cycle between the
pressure limits of 6 MPa and 10 kPa. Steam is heated in a heat
exchanger at a rate of 1.15 kg/s by the exhaust gases leaving the
gas turbine,...

A steam turbine has an inlet of 3 kg/s water at 1.2 MPa, 500°C
with velocity of 16 m/s. The exit is at 150 kPa, 250°C and very low
velocity. Find the power produced and the rate of entropy
generation.

Steam flows steadily through an adiabatic turbine. The inlet
conditions are: 20 MPa, 500°C, 90 m/s and the exit conditions are
20 kPa, 95% quality, and 60 m/s. The mass flow rate of the steam is
15 kg/s. Find:
a) The change in kinetic energy of the steam, (5 points)
b) The power output, and (5 points)
c) The turbine inlet area. (5 points)

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