Question

**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 of a fluid per minute goes through a
reversible steady flow process. The properties of fluid at the
inlet are P1 = 1.4 bar, ρ1 = 25 kg/m3, V1 = 120 m/s and u1 = 920
kJ/kg and at the exit are P2 = 5.6 bar, ρ2 = 5 kg/m3, V2 = 180 m/s
and u2 = 720 kJ/kg. During the passage, the fluid rejects 60 kJ/s
and rises through 60 metres. Determine : (i) the change in enthalpy
(Δh) and (ii) work done during the process (W).**

Answer #1

1) A nozzle is a device for increasing the velocity of a
steadily flowing stream of fluid. At the inlet to a certain nozzle
the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60 m/s.
At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle
is horizontal and there is negligible heat loss from
it.
(i) Find the velocity at the nozzle exit.
(ii) If the inlet area is 0.1 m2 and specific volume...

Consider an adiabatic turbine. At steady mass flow rate of 10
kg/s, steam enter the turbine at 4.5 MPa, 600°c and 85 m/s and
leaves the turbine at 40 kPa, quality of 0.8 and 50 m/s. Determine
:
a) the power output
b) the turbine inlet area

Steam at 6 MPA, 600°C, enters a well-insulated turbine operating
at steady state and exits at 0.1 bar. The isentropic efficiency of
the turbine is 94.7%. Assuming the kinetic and potential energy
effects to be negligible, determine:
(a) Work output, in kJ/kg,
(b) The temperature at the exit of the turbine, in °C, and
(c) The rate of entropy production within the turbine, in kJ/K
per kg of steam flowing through the turbine.
(All steps required – Given/Find/Schematic/Engineering
Model/Analysis)
THANK...

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....

Steam enters a control volume operating at steady state at 3 bar
and 160 ◦ C with a volumetric flow rate of 0.5 m3 /s. Saturated
liquid leaves the control volume through exit #1 with a mass flow
rate of 0.1 kg/s, and saturated vapor leaves through exit #2 at 1
bar with a velocity of 5 m/s. Determine the area of exit #2, in m2
.

300 kg/hr of superheated steam is used to drive a turbine at a
velocity of 50 m/s. the superheated steam enters the turbine at 60
bar and 400°C . The stream leaves the turbine as a saturated steam
with a velocity of 100 m/s at 1.5 bar. The turbine delivers work
and the heat loss from the turbine is 10 KW.
a) Calculate the net kinetic energy of the system (delta kE) and
determine the work done by the turbine...

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...

Air at 277 oC and 1000 kPa enters a turbine operating at steady
state with a mass flow rate of 70 kg/hr. It exits the turbine at 27
oC and 700 kPa. During this process heat is added from the
surroundings at 77 oC to the turbine at a rate of 1000 kJ/hr. Using
variable specific heats, determine whether this claim is correct.
Justify your answer.

Steam at 250oC and 1 MPa enters a compressor at a steady rate of
2 m3 /s with a velocity of 0.1 m/s. The device uses 6500 kJ/s of
energy to compress the steam to a temperature of 500oC and a
pressure of 4 MPa. Assuming that this device is adiabatic and that
you can ignore potential energy changes, calculate the steam
velocity and mass flow rate at the exit of the compressor.

Saturated water vapor leaves a steam turbine at a flow rate of
1.47 kg/s and a pressure of 0.51 bar. The vapor is to be completely
condensed to saturated liquid in a shell-and-tube heat exchanger
that uses city water as the cold fluid. The water enters the
thin-walled tubes at 17oC and is to leave at 57.6
oC. Assuming an overall heat transfer coefficient of
2000 W/m2K, determine the required heat exchanger
surface area and the water flow rate. cp,c...

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