2/3/15
quality: x = mass vapor/total mass
enthalpy: combination, H=U+PV (kJ) can also have specific values
o constant pressure processes in chemistry atm pressure so usually
just heat
o some cases heat, other can be work
o enthalpy of evaporation is dif

MEAM 203
SPRING 2011
MIDTERM II
Closed books. One sheet (two-sided) with formulas is allowed. Answer all 3 questions. Write clearly! Explain all
steps!
Before starting: (i) Put down your name and (ii) Sign the Commitment to Academic Integrity in the exam

MEAM 203
SPRING 2013
THERMO - MIDTERM I SOLUTIONS
1. (i)
The initial temperature can be found from the ideal gas law: T1=p1V1/(mR)=105 Pa 1m3/(1kg 208
J/kg-K)=480.8 K. After isothermal compression to half the original volume, the pressure will double:
p2

MEAM 203
SPRING 2013
THERMO - MIDTERM I
Closed books. One sheet with formulas is allowed. Answer all 3 questions. Note that different questions have different
weights. Write clearly! Explain all steps!
GOOD LUCK.
1. (50 %) One kilogram of argon (assumed t

MEAM 203
SPRING 2010
THERMO - MIDTERM I
Closed books. One sheet (two-sided) with formulas is allowed. Answer all 4 questions. Write clearly! Explain all steps!
Before starting: (i) Put down your name and (ii) Sign the Commitment to Academic Integrity in t

MEAM 203
SPRING 2011
THERMO - MIDTERM I
Closed books. One sheet with formulas is allowed. Answer all 3 questions. Note that different questions have different
weights. Write clearly! Explain all steps!
GOOD LUCK.
1. (40 %) One kilogram of nitrogen (consid

MEAM 203
SPRING 2009
THERMO - MIDTERM I
Closed books. One sheet with formulas is allowed. Answer all 4 questions. Write clearly!
GOOD LUCK.
1.
(25%)
The
Explain all steps!
processes
undergone by an ideal, reversible
A
heat engine are described in the TS d

MASS AND ENERGY ANALYSIS
OF CONTROL VOLUMES
Control Volume (CV) a region in space with real or
imaginary boundaries
Conservation of Mass Principle
General conservation of mass
General conservation of mass in rate form
or
Conservation of mass principle
for

MEAM 203
SPRING 2008
THERMO - MIDTERM I
Closed books. One sheet with formulas is allowed. Answer all 4 questions. Write clearly!
GOOD LUCK.
Explain all steps!
1. (20%) An ideal gas is enclosed in a cylinder capped with a piston. The motion of the piston i

MEAM 203
SPRING 2006
THERMO - MIDTERM I
Closed books. One sheet with formulas is allowed. Answer all questions. Write clearly!
GOOD LUCK.
Explain all steps!
1. (42%) A cylinder, capped with a piston with cross-sectional area A p, contains an
ideal gas ini

MEAM 203
SPRING 2005
THERMO - MIDTERM II
Closed books. One sheet with formulas is allowed. Answer all three questions. Write clearly!
Explain all steps! GOOD LUCK.
(30%) Problem 1
A rigid tank contains 2kg of air initially at 200kPa and at the ambient tem

MEAM 203
SPRING 2006
THERMO - MIDTERM II
Closed books. One sheet with formulas is allowed. Answer all three questions. Write clearly!
Explain all steps! GOOD LUCK.
(40%) 1. Consider an ideal air-standard cycle for a gas-turbine, jet propulsion unit (rever

MEAM 203
FALL 2004
THERMO - MIDTERM II
Closed books. One sheet with formulas is allowed. Answer all three questions. Write clearly!
Explain all steps! GOOD LUCK.
(33%) Problem 1
A cylinder capped with a piston contains 2kg of water initially at 1000kPa an

MEAM 203
FALL 2004
THERMO - MIDTERM I
Closed books. One sheet with formulas is allowed. Answer all three questions. Write clearly! Explain all steps!
GOOD LUCK.
(30%) 1 . A heat engine operates in a cycle while receiving 1kJ of heat per cycle from a hot r

Read Chapter 8: Exergy
Quiz 11 is available on line
No HW assignment this week
Hand in HW # 9 Today
Cheat-sheet: one double-sided 811
EXERGY (Ex)
Availability
A MEASURE OF WORK
POTENTIAL
Assessing the value of a
resource
T=280K
Ambient temperature
T0=290K

Multi-Component Systems An Introduction
Multi
Mixtures appear frequently in nature and in applications
Examples:
Air ~78%N2 + 21%O2 + 0.9% Ar + CO2 + vapor water +trace elements
Natural gases
Carbonated beverages, drugs, food products
Some Objectives:
Det

MIDTERM II + SOLUTIONS (S08)
1.
(25%) Carbon dioxide is compressed in a steady state steady flow, reversible, isothermal process from 100kPa
and 20C to 400kPa. The compressor exchanges heat with an ambient at 20C and 100kPa. Assume that the CO2
behaves li

MEAM 203
SPRING 2013
MIDTERM II
1. STATISTICS
Range:
Average grade:
Standard deviation
Median
22-98
79
19
86
2. GENERAL COMMENTS
* Do not provide multiple answers for me to choose from. I will select the wrong one! By
copying various, often unrelated form

MEAM 203
SPRING 2006
THERMO FINAL EXAM
Closed books. Answer all four questions. Write clearly! Explain all steps. Answers without
clear explanation will be discounted.
GOOD LUCK.
(25%) 1. A steam engine (see the figure on the right) consists of a boiler w

energy interaction: potato is system, boundary between thermodynamic
system and surroundings (air, table), lost heat from baked potato to
surroundings
o lose 2 kJ, environment gains 2kJ by inc temp
o has a lot of heat = a lot of internal energy, heat is

steam: must understand its properties since commonly used
o compressed liquid: heating water under constant pressure, water
will expand when heated since density will drop and vol increase,
water will evaporate at 100 deg C.
o saturated liquid : almost p

1/22/15
thermodyanimc state: has own set of thermo prop, can determine all
thermo variables if different states.
o not all independent, can specify two intensive prop = find state
(state postulate)
o ex: ideal gas law, air is treated as an ideal gas, PV=

2/5/15
generalized tables used for materials that are less known
PVT are related to each other and form a surface in 3D
o different values of pressure have horizontal slices
o vertical lines are PV diagrams
o usually just focus on liquids and fluids, n

MEAM203GeneralInstructions(January9,2007)
HaimH.Bau
1
MEAM 203: INTRODUCTION TO THERMODYNAMICS
Instructor: Haim H. Bau
The course covers fundamental concepts of thermodynamics such as work, conservation of
energy, order and disorder, entropy, and thermody

STATE POSTULATE: The state of a simple substance is defined by TWO
independent, intensive thermodynamic properties
The equation of state provides a relationship between three
thermodynamic properties f(p,v,T)=0
The equation of state can be either in
Table

BRAYTON CYCLE with
APPLICATIONS for PROPULSION
GAS CYCLES
Brayton, George (1830-1892), U.S. mechanical engineer and pioneer in the
development of internal combustion engines, invented the continuous ignition
combustion engine that later became the basis f

MEAM 203
SPRING 2005
THERMO - MIDTERM I
Closed books. One sheet with formulas is allowed. Answer all questions. Write clearly!
GOOD LUCK.
Explain all steps!
(40%) 1. A cylinder (B), capped with a frictionless, freefloating piston, is connected to a 1m3 ta