Question

Using thermodynamic
tables, and interpolation where needed, at *p* = 3 bar,
*v = 0.*5 m^{3}/kg, **compute**
*T* in °C and *u* in kJ/kg. Also locate the state on
sketches of the *p*–*v* and *T*–*v*
diagrams.

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

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

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 interpolation calculate the enthalpy of saturated liquid
R-134a at P= 680 kPa
a 558 kJ/kg
b 88 kJ/kg
c 350 kJ/kg
d 120 kJ/kg

The equation of state of a gas is given as bar v(P+10/bar v^2) =
RsubuT, where the units of bar v and P are m^3/kmol and kPa
respectively. Now 0.49 kmol of this gas is expanded in a
quasi-equilibrium manner from 1.6 to 4.9 m^3 at a constant
temperature of 290 K. Determine the work done during this
isothermal expansion process.

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...

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

Carnot Thermodynamic cycle: Design a your own carnot for 1 mole
on an ideal gas.
A) Describe what happens in each step. Specify a numeral value
for P, V and T for each step.
Step 1
Step 2
Step 3
Step 4
B) Draw a indicator (p vs V) diagram for your carnot cycle?
C) Complete the following table Give starting equations final
answers. Show your work?
q (in kJ)
w (in kJ)
∆U (in kJ)
∆H (in kJ)
Step...

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...

An oil stream flowing at a rate of 60 m3 /h (?oil = 952.9 kg/m3
), at temperature of 10°C is to be heated to 175°C+/-0.5°C in a
heat exchanger using high pressure saturated steam. (a) With the
aid of the steam tables appended to this paper determine the
minimum pressure required of a saturated steam stream to achieve
this result? [5%] (b) If the actual temperature of the condensing
steam is to be 15°C?0.5°C above the minimum what is...

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