Question

For H2O, determine the specified property at the indicated state. Sketch the T-v diagram and locate the state.

a) p = 2 MPa, T = 250°C. Find v in m3 /kg.

b) p = 900 kPa, u=2000 kJ/kg. Find T in °C and x.

c) p = 1.5 MPa, T = 353°C. Find u in kJ/kg.

d) T = 280°C, x = 25%. Find v in m3 /kg

Answer #1

Using the tables for water, determine the specified
property at the indicated states. Show the state using a p- and T-v
diagrams:
At p = 3 bar and v = 0.5 m3/kg, find T in C and u in kJ/kg
Correct Values: T = 133.6; u=2196.7
At T = 3200C, v = .03m3/kg, find p in MPa and u in kJ/kg
Correct Values p = 7.47MPa: u = 2677.9

Find the missing properties and give the phase of the
substance
H2O T = 120°C, v = 0.5 m3/kg u =? P =? x =?
N2 T = 100 K, x = 0.75 v =? u =?
R-410 A: T=-200C, u=220 kJ/kg, P=? x=?
R-134A: T=400C, h=400 kJ/kg, u=?, v=?, x=?, P=?

Using thermodynamic
tables, and interpolation where needed, at p = 3 bar,
v = 0.5 m3/kg, compute
T in °C and u in kJ/kg. Also locate the state on
sketches of the p–v and T–v
diagrams.

given properties determine the indicated missing property, and
specify the state of the fluid
For water, T=420° C, P=10 bars, u=? and h=?

ROUND UP TO 4 DECIMAL PLACES. Draw and label the P-V & T-S
diagrams.
An ideal air-standard Otto cycle engine has a compression ratio
of 9. At the beginning of the compression process, the air is at
100 kPa, 27°C and 960 kJ/kg heat is supplied to the system.
Determine the (a) Temperature and Pressure at each state, (b) Net
work (kJ/kg), and (c) Efficiency

One kg of water in a piston-cylinder assembly
undergoes two processes in series from an initial state where p1 =
0.8 MPa, T1 = 500°C:
Process 1-2: Constant-pressure compression until the
volume is half of
the initial volume.
Process 2-3: Constant-volume cooling until the
pressure drops to 400 kPa.
Sketch the two processes in series on a p-v and T-v
diagram. Determine the work and heat transfer for both
processes.

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...

4.1A membrane made of 0.1 mm thick soft rubber separates pure O2
at 1 atm and 25oC from air at 1.2 atm pressure. Determine the mass
flow rate of O2 through the membrane per unit area and the
direction of flow.
Molar flow rate of oxygen is given by: ???? = ???????? / ???
(????1 ? ????2 )
where S is solubility of oxygen in rubber.
The mass diffusivity of oxygen in rubber at 298 K is DAB = 2.1...

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