Homework 7
1) Determine A gallon of milk at 68 is placed in a refrigerator. If energy is removed from
F
the milk by heat transfer at a constant rate of 0.08 Btu/s, how long would it take, in
minutes, for the milk to cool to 40 The specific heat and densit
/
ME 251 Ol
Exam 3
Problem #1
Problem #2
Problem #3
Problem #4
Problem #5
Total:
/10
/15
/25
/15
/25
/90
Name:
KEY
All work on this exam is my own and has been written during the exam. I have used only
materials and resources that were explicitly list
Chapter 4
Control Volume Analysis Using
Energy
Learning Outcomes
Demonstrate understanding of key
concepts related to control volume
analysis including distinguishing between
steady-state and transient analysis,
distinguishing between mass flow rate and
v
Chapter 1
Getting Started
Introductory Concepts and Definitions
Learning Outcomes
Demonstrate understanding of several
fundamental concepts used throughout this
book . . . Including closed system, control
volume, boundary and surroundings,
property, state
Chapter 1
Getting Started
Introductory Concepts and Definitions
Learning Outcomes
Demonstrate understanding of several
fundamental concepts used throughout this
book . . . Including closed system, control
volume, boundary and surroundings,
property, state
Chapter 3
Evaluating Properties
Learning Outcomes
Demonstrate understanding of key
concepts . . . including phase and pure
substance, state principle for simple
compressible systems, p-v-T surface,
saturation temperature and saturation
pressure, two-phase
Homework 13
1. (5 points) Air is compressed isentropically from 60F and 15 lbf/in2 to p2 = 180 lbf/in2. Assuming air
behaves as an ideal gas, find T2 using (a) pr values from Table A-22E, (b) isentropic ideal gas relations
with k = 1.4. How close are your
1) KNOWN: Water vapor at specied pressure and temperature.
FIND: Compressibility factor using compressibility chart and steam tables.
SCHEMATIC AND GIVEN DATA:
P = 120 bar
T: 520°C
ANALYSIS:
(a) Using the compressibility chart, compressibility factor is r
Homework 5 Solution
1) Given: 5 kg of saturated liquid water is at 120
C.
Find: the pressure and specific volume of the water and the total volume occupied by the
water.
p = 1.985 bar
= 1.0603 10 - 3 m3/kg
V = 5kg 5.3015 10 - 3 m3
=
2)
3)
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ME251 - 01
Exam2
Problem #1 Problem #2
Problem #3
Problem #4
Name
- -
f:-rzy
/35
/10
/25
130
Total:- - -/100
All work on this exam is my own and has been written during the exam. I have used only
materials and resources that were explicitly listed by th
Chapter 9
Gas Power Systems
Learning Outcomes
Perform air-standard analyses of internal
combustion engines based on the Otto,
Diesel, and dual cycles, including:
sketching p-v and T-s diagrams and evaluating
property data at principal states.
applying ene
Chapter 9
Gas Power Systems
Learning Outcomes
Perform air-standard analyses of internal
combustion engines based on the Otto,
Diesel, and dual cycles, including:
sketching p-v and T-s diagrams and evaluating
property data at principal states.
applying ene
5
The Second
Law of
Thermodynamics
CHAPTER SUMMARY AND STUDY GUIDE
In this chapter, we motivate the need for and usefulness of the
second law of thermodynamics, and provide the basis for subsequent applications involving the second law in Chaps. 6 and 7.
12
Ideal Gas Mixture
and Psychrometric
Applications
CHAPTER SUMMARY AND STUDY GUIDE
In this chapter we have applied the principles of thermodynamics
to systems involving ideal gas mixtures, including the special
case of psychrometric applications involvi
14
1Chemical and
Phase Equilibrium
CHAPTER SUMMARY AND STUDY GUIDE
In this chapter, we have studied chemical equilibrium and phase
equilibrium. The chapter opens by developing criteria for equilibrium and introducing the chemical potential. In the second
KEY EQUATIONS
n 5 m/M
(1.8) p. 14
Relation between amounts of matter on a mass basis, m, and on a molar basis, n.
T(8R) 5 1.8T(K)
(1.16) p. 21
Relation between the Rankine and Kelvin temperatures.
T(8C) 5 T(K) 2 273.15
(1.17) p. 22
Relation between the C
13
Reacting Mixtures
and Combustion
CHAPTER SUMMARY AND STUDY GUIDE
In this chapter we have applied the principles of thermodynamics
to systems involving chemical reactions, with emphasis on systems involving the combustion of hydrocarbon fuels. We also
Ch. 2: Energy & 1st Law of Thermo
Closed Systems
Ch. 2: Energy & 1st Law of Thermo
Closed Systems
Esys
I. E, Energy (a property)
Mechanical Energy:
Kinetic Energy,
Translational
Potential Energy,
Gravitational
I. E, Energy
Internal Energy, U:
sum of micro