Chemical Engineering — Thermodynamics (2164)
Homework 1:} Bubble-Point Calculations
Question 1. For a 50:50 liquid mixture of H25 and benzene at 300 K, the measured equilibrium
pressure is 10.9 bar. Use the measured equilibrium pressure to estimate the kg
Chem 2164 Homework 18 SOLUTION
Review of Power Generation: Cogeneraton/Landfill Gas
(1) Net Power = power produced by turbine plus power from compressor
!" !"# !"# !"# ! !"# !.!" !
!
Power to turbine = !"#
= 4.2210! ! = 4.22
Chemical Engineering Thermodynamics (2164)
Homework 5
1(a).
High pressure steam at 4.0 MPa is used to drive an adiabatic turbine. It enters the
turbine at 500C and leaves at 200C. The exit pressure of the steam is 0.3 MPa. The
turbine generates 750 kW, wh
Heat Capacity / Specific Heat
How much heat do you need to change the
temperature of a substance?
Define:
dQ
C
dT
Q is a path function so C depends on the
path
1
Consider only pV work
1. Constant Volume heat Capacity
dQv dU v dWv dU v dU
Cv
dT
dT
dT
dT
d
Thermo ChE 2164
Professor William Ducker
Randolph Hall 1.42A
wducker@vt.edu
Tel. 231 7869
See Syllabus
1
Thermo 2164
Thermodynamics is the study of the
transformation of energy into different
forms
e.g. chemical heat work electrical
finish
wsys
start
Fex
Chemical Engineering Thermodynamics (2164)
Homework 9
Joule-Thompson Coefficient and Real Engines
3. Illustration 5.2-2. An automobile air conditioner uses a vapor-compression refrigeration
cycle with the environmentally-f
Chemical Engineering Thermodynamics (2164)
Homework 10
1. In a manuscript submitted by a UVA student to the Virginia Tech Journal of Thermodynamic
Precision, the student claimed to have obtained the following expressions for the V and U of
a new
Chemical Engineering Thermodynamics (2164)
Homework 8
1. The power required to heat a building to 22 C is 85,000 kJ/h when it is heated by
conventional resistive heating. What is the power required when a heat pump is
used with a cold reservoir at 8C. (As
Enthalpy
Heat and Work are path functions. It would be convenient to
have a state function that is similar to heat.
Trivial: U = Q + W. When W=0, U = Q
Heat is a state function when no work is done
Define Enthalpy: H=U+PV
U, P, V are state functions so H
First Law in a Closed System
Energy is Conserved
If we look at part of the world (the system ) and see
that the energy has changed, then we know that the
energy must have come from somewhere
system ENERGY = INTERACT. WITH SURROUND
Classifications
system
Chemical Engineering Thermodynamics (2164)
Homework 1
1: Units
(a) Convert the following pressures into units of Nm-2:
1.5 atm, 562 mmHg, 33.67 bar, 25 Torr, 2.6 Pa
2: Partial Derivatives
Recall that PV = nRT. We define V=Vm= V/n so P = RT/V
P
1
V
P
Chemical Engineering Thermodynamics (2164)
Homework 4
A closed rigid, adiabatic container with a volume of 19.8 L is divided into two equal
portions by a membrane of negligible thickness, as shown in Figure 1. One portion
(V=9.9 L) contains 100 grams of s
Question 1 .
I "EQLIJEEQEE§"“f
%{C£qeﬂgcx7%- \Es
[Sandler 9.12]
Similar to Sandler Illustration 7.41. First use the “Peng
Robinson EOS" program from Sandler's CD to calculate the
molar volume, then use equation 7.4—6 to calculate the
fugacity. Example o
Your Name: UCKER
Virginia CHE 2164 THERIVIO
[WTech
w FINAL EXAM (MAKEUP)
2013
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Allowed:
You can use your computer for calculations, and for looking at other materials,
such as my lecture notes, or homework problems,
Your Name: DUQKER
V' inia CHE 2164 THERMO
@Tech
2 0 1 2
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Allowed:
Open book exam. You may use a computer
Your wireless must be off for the entire exam.
Write answers in boxes when provided.
FINAL EXAM (MAKE
EDUQK‘EYK
Virginia CHE 2164 THERMO
[MHTech
w EXAM 3 DEC 3, 2012
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Conditions: Closed Book, 2h, st
YOUR NAME:
Virginia CHE 2164 TH ERMO
“MITECh
w EXAM 3 Dec 1,2011
:
Conditions: Closed Book, 2h, steam tables provided, Table 6.2.1 is on page 1 8:2
Allowed: Calculator, 10 cm x 15 cm index card
Gas Constant = 8.31 Jmole'lK'l
Write your final numerical ans
YOUR NAME: D U LKEKZK
Virginia CHE 2164 THERMO
[WTECh
w EXAM 3 DEC 5,2012
:
Conditions: Closed Book, 2h, steam tables provided, you may use your computer
for calculations, e.g. excel, Sandler visual basic programs; you may not use your
computer to refer t
Homework 11_5 Fugacity of a Pure Substance
CHE 2164 William Ducker
(1) [Sandler 7.16] Calculate the Fugacity of Steam at 400C and 2.0 MPa
(a) Using the specific volume data in the steam tables.
(b) Using H and S from the steam tables.
(c) From the Peng-Ro
Chemistry 3615
Final Exam
December 12, 2003
_
Name
Answer Sheet
Circle the Correct Letter. If you change your mind, completely erase the wrong answer if
you are using pencil. If you are using pen completely black out the wrong answer and
clearly indicate
Sandler Homework Problem 7.16 Solution
Fugacity of water at 400 C and 2 MPa
Data from Steam Tables at 400 C
1
f P exp
RT
RT
o V P dP
P
P
Constants
molar mass of water
0.018
R
8.31
Parameters
Temperature
673.15
Pressure
2
VOLUME
VOLUME
PRESSURE
speci
ChemicalEngineeringThermodynamics(2164)
Homework11
1. [Sandler 7.1a] Using the steam tables, establish that G(liquid) = G(vapor) for steam at 2.5
MPa and 224C
2. [Sandler 7.13] The following data have been reported for the vapor pressure of ethanol as
a f
D Q (:14: ER
i,» P4952:
Vlrglnia CHE 2164 THERMO
[MITech
W EXAM 3 DEC 4, 2014
Conditions: Closed Book, 2h, steam tables provided, you may use your calculator
or computer for calculations, e.g. excel, Sandler visual basic programs; you may
not use your com
Chemical Engineering — Thermodynamics (2164)
Homework 12 SOLUTIONS
Question 1:
(5) WV : VLS + VLVCOSB
so '.-’_‘.‘
(3:90"
(b) c058 must decrease, so vsv must decrease. Adsorb to the solid—va por interface.
it) The contact angle also depends on the change i
Your Secret Code: D toe/Km
Virginia CHE 2164 TH ERMO
@Tech
2014
Conditions: Closed Book, 2h, steam tables provided, you may use your calculator
FINAL EXAM (MAKEUP)
or computer for calculations, e.g. excel, Sandler Visual basic programs; you may
not use yo