Question

_{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}

Answer #1

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

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=?

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.

Use the steam tables to determine the specific volume and
internal energy of water at each of the following conditions. If
there is more than one phase present, give values of V and U for
each phase. a) P=Psat, T=55°C b) P=0.4MPa, T=Tsat c) P=3.2MPa,
T=Tsat

a. At pressure p=10 MPa, the Enthalpy (with reference to the
tables A4/A5/A6/A7) for a closed system containing water is equal
to 3000 kJ/kg.. What is the phase of the system?
……………………………………….(1 point)
b. What is the Entropy for super heater vapor at p=10 MPa, and
T=480℃? ………………………. (1 point)
c. Given below is missing data for air modeled as an ideal gas.
Assuming constant Cp and Cv with temperature, fill out the table (3
points). k=1.4
Δs (kJ/(kg.K)) T_1...

Determine the final specific volume (m3/kg) for a gas undergoing
a process from state 1 (T1 = 324 K, v1 = 0.2353 m3/kg) to a
temperature of T2 = 883 K if s2 - s1 = 0.961 kJ/kg-K. Assume
constant specific heats as given below (DO NOT USE the ideal gas
tables).
Cp = 1.135 kJ/kg-K
Cv = 0.759 kJ/kg-K
Note: Give your answer to four decimal places.
Correct Answer:
[Correct] 0.4006 ± 1%
Please show your methodology.

A 5 kg mass of R134a refrigerant is compressed
polytropically from the state initial: p1 = 1 bar, T1 = 27 ° C
until the final state: p2 = 15 bar, T2 = 227 ° C. Specific heat
R134a medium at constant volume, Cv = 0.72 kJ / kg K.
Calculate:
a) exponent of polytropy;
b) final volume;
c) final volume using the virial state equation d) work done on the
gas for compression;
e) amount of heat given up...

A cylinder fitted with a frictionless, massless piston contains
compressed liquid water at a temperature T1=20C. The atmospheric
pressure on the outside of the system is P=1.0 bar. Heat is then
added until the water is completely converted to saturated
vapor.
(a) What are the changes in specific volume, v2-v1
(m3/kg) and internal energy, u2-u1 (kJ/kg) of the water
for this process?
(b) How much specific work, if any, is done by the system?
(c) What is the amount of...

1.
Find values of residual enthalpy for ethylene at 400 K and 25 bar
using Peng-Robinson equation of state.
2. Find values of residual Gibbs energy, enthalpy and entropy
for n-heptane at 500 K and 100 bar using Virial equation of
state.
3. Estimate the values of Compressibility factor, enthalpy and
entropy for Benzene and cyclohexane if it compressed from 650 K and
60 bar to 500 K and 110 bar.
4. Calculate ΔU and ΔH for 1 kg of...

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