Question

Steam at a pressure of 3 MPa and with a temperature of 250oC is mixed with wet steam at a pressure of 3 MPa and with a dryness fraction of 0.92 in the ratio of 1:2.5 by mass, Determine

(a) the quality of the steam mixture

b) the density of the steam mixture

Answer #1

Steam with pressure 6 MPA and temperature 500 ⁰C expands
in an adiabatic turbine to saturated steam and a pressure of 0,3
MPA. Kinetic energy and potential energy is neglected. Determine
work produced, entropi generated and exergy destroyed for the
turbine. Assume surrounding to 0,1 MPa och 25 ⁰C.

A piston-cylinder device contains 0.54 kg of steam at 300
degrees C and 3 MPa. Steam is cooled at constant pressure until
one-half of the mass condenses. (A) Find the final temperature (B)
Determine the volume change

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...

A supply line of steam at 0.8 MPa and quality of 0.95 (state 1)
is mixing with steam at 0.8 MPa, 250 0C, and flowing at
the rate of 1 kg/s (state 2) in a mixing chamber. After adiabatic
mixing the flow rate is 2.3 kg/s (state 3), determine the phase of
mixture at the exit when the pressure is 0.8 MPa. Draw schematic
and P-v, T-v, and T-s diagrams to show the above
processes accurately.

Steam enters a nozzle operating at a pressure of 30 [bar] and a
temperature of 320 [◦C] with negligible velocity. The steam exits
the nozzle at a pressure of 15 [bar] and a velocity of 10 [m/s].
The mass flow rate is 2.5 [kg/s]. Assume the nozzle is well
insulated.
Determine the exit temperature of the steam.

A piston-cylinder device contains 0.9 kg of steam at
350⁰C and 1.4 MPa. Steam is cooled at constant
pressure until one-half of the mass condenses.
(a) show the process on a T-v and P-v diagrams,
(b) find the final temperature and
(c) determine the volume and entalphy changes.

A 4 m tank contains wet steam at 1 MPa. What is the volume
occupied by the vapour phase if the quality is 60%?

Heat flow between connected tanks.
Two identical tanks, each with volume 0.250m3,contain steam.
Tank A contains 2.5 kg ofsteam at 400 C. Tank B contains 2.5 kg of
steam at10 bar.
a. Determine the pressure in tank A. If the state is a
vapor/liquid mixture, determine the mass fraction of the vapor.
b. Determine the temperature in tank B. If the state is a
vapor/liquid mixture, determine the mass fraction of the vapor.
c. The two tanks are linked with...

3. A two-phase liquid-vapor mixture of water, initially at 1.0
MPa with a quality of 71.1436%, is contained in a rigid,
well-insulated tank. The mass of H2O is 2 kg. An electric
resistance heater in the tank transfers energy (heat) to the water
at a constant rate of 80 W. Determine
(a) the time, in hour, when the temperature in the tank reaches
350oC, and
(b) the final pressure, in MPa.

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.

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