1.Introduction
Tuesday, May 27, 2014
10:56 AM
Objectives:
Review work, kinetic energy, and potential
energy
Introduce the 1st Law of Thermodynamics
Evaluation of energy content in a closed system
Evaluation of energy transfer
Efficiency
Chapter 2 v20

Equations to Find Properties
Property of Pure Substances Using Tables
Formula to interpolate values in Tables
1
y=
(2 1 ) + 1
2 1
1 , 2 , 1 , 2 are found in the Table
Saturated Liquid-Vapor Mixture
x=
x=
=
y is found from formula if x is given
01
x qual

Boundary Work
Work
2
2
=
=
1
1
Isothermal compression or expansion of an
Power
=
= .
Applications
Spring work:
= 1 1 ln(2 )
ideal gas:
1
n
Polytropic process (PV = constant):
=
22
2
12
=
2
2 2 1 1
1
Electric Work and Power: = , =
Shaft Power: = 2

3.First Law of Thermodynamics
Tuesday, May 27, 2014
10:59 AM
Example Bank Account:
Example. Heat transfer coming into a closed system during two hours
of operation is equal to 1000 kJ. During the same time it delivers 200 kJ
of work. Determine the increas

7/16/2014
Example 6. Use of Specific Heats
A well-insulated copper tank of mass 13 kg contains 4 kg of liquid water. Initially, the temperature of the copper is 27C
and the temperature of the water is 50C. An electrical resistor, of negligible mass, trans

Example 4 Use of cp and cv
Monday, October 21, 2013
4:53 PM
Air at T1 = 27 oC and 100 kPa is heated at constant pressure to T2 = 727 oC. Find the
change is u and h using:
a) Air table A-17 b) Table A-2b ,
c) Table A-2c
Copy of Energy Analysis in Closed v2

1112 1
Thermod namics 0
we
M4 a W :73 cfw_My 5,
Last Name Middle Initial First Name
Note: Make sure that you justify every step
1. A refrigeration unit has a capacity of 22.5 tons of reigeration. Using the conversion factors
provided to you, Its capacit

The Second Law of Thermodynamics
Thermal Energy Reservoirs
6-1C , 6-2C, 6-3C, 6-4C, 6-6C
Heat Engines and Thermal Efficiency
6-14C , 6-19, 6-21, 6-26
Refrigerators and Heat Pumps
6-31C, 6.40, 6.44, 6.45
Perpetual-Motion Machines
6-56
Reversible and Irreve

Sam) 77ch) v/
First Exam Thermdenamics Fall 2014
Last Name Middle Initial First Name
The following description applies to the next two problems
A gas is contained in a vertical, frictionless pistoncylinder device as shown in the gure. The
piston has a mas

First Exam Thermgdxnamics Fall 2014
Sow 7701) v 2
Last Name Middle Initial First Name
The following description applies to the next two problems
A gas is contained m a vertical, 'ictionless pistoncylinder device as shown 1n the gure. The
piston has a mass

Example 7
Wednesday, October 23, 2013
3:58 PM
Use of Specific Heats
A well-insulated copper tank of mass 13 kg contains 4 kg of liquid water.
Initially, the temperature of the copper is 27C and the temperature of the
water is 50C. An electrical resistor,

7.Expansion-Compression Work
Wednesday, May 28, 2014
4:35 PM
Work is equal to the area under the p-V curve
Work is an inexact differential
Example 1. Assume expansion with constant p=100 kPa. The change in volume is
equal to V = 2 m3
Find
a. Work and
b. p

7.Expansion-Compression Work
Wednesday, May 28, 2014
4:35 PM
Work is equal to the area under the p-V curve
Work is an inexact differential
Example 1. Assume expansion with constant p=100 kPa. The change in volume is
equal to V = 2 m3
Find
a. Work and
b. p

7.Expansion-Compression Work
Wednesday, May 28, 2014
4:35 PM
Work is equal to the area under the p-V curve
Work is an inexact differential
Example 1. Assume expansion with constant p=100 kPa. The change in volume is
equal to V = 2 m3
Find
a. Work and
b. p

Prob 1-2
Tuesday, August 5, 2014
4:02 PM
This problem and the next one are based on the following description:
The manometer in the figure shown below is used to measure the pressure inside the air
duct. The fluid inside the u-tube is water with a density

7/16/2014
MassandEnergyConservation
inControlVolumes
OpenSystemsorControlVolumes
ClosedSystems
m=constant
Ein Eout Esys
dEsys
E in E out
dt
Ein Eout Ecv
dE
E in E out cv
dt
Introduction
1
7/16/2014
Introduction
ConservationofMass
min mout mcv
m in m out

7/4/2014
Evaluating Properties
Applying Properties and Energy
Balances to Closed Systems
Goals of Chapter
Energy equation E2 E1 = Q-W solves for only one
unknown.
The main goal of this chapter is to find properties such
as U, p, T, v, for simple compres

7.Expansion-Compression Work
Wednesday, May 28, 2014
4:35 PM
Work is equal to the area under the p-V curve
Work is an inexact differential
Example 1. Assume expansion with constant p=100 kPa. The change in volume is
equal to V = 2 m3
Find
a. Work and
b. p

Prob 1, 2, 3
Wednesday,July30,2014
6:49PM
Air inside a frictionless piston-cylinder device expands slowly according to p= aV2, where
p is the absolute pressure of the air, a is a constant, and V its volume at any instant during
the expansion process. At t

7.Expansion-Compression Work
Wednesday, May 28, 2014
4:35 PM
Work is equal to the area under the p-V curve
Work is an inexact differential
Example 1. Assume expansion with constant p=100 kPa. The change in volume is
equal to V = 2 m3
Find
a. Work and
b. p

Example 5 Ideal Gas Heating
Monday, October 21, 2013
4:53 PM
A piston-cylinder container holds 1.2 kg of air, initially at 27C, 0.5 Mpa. The air is
heated until its volume doubles. Assuming ideal gas behavior, determine the net heat
transfer to the air if

2.Review of Work, Kinetic Energy and Potential Energy
Monday, June 2, 2014
3:41 PM
Definition of Work
W= F.x KE 1 mv 2
2
W
s2
s1
F .ds KE2 KE1
Power
The work of all forces is equal to the increase in Kinetic Energy
Potential Energy and total mechanical

8.Energy Balance in a Closed System
Tuesday, May 27, 2014
11:01 AM
The first law states that energy can be neither created nor destroyed
during a process; it can only change forms.
Esys Ein Eout
dEsys Ein Eout
Esys Q W
dEsys Q W
Differential Form:
dEsys
d

Fundamentals of Engineering
Thermodynamics
Chapter 1. Review of Fundamental
Concepts
Dr. Ramiro H. Bravo
Reading Assignment: Read all chapter 1
Homework: Check Blackboard
Introduction to Thermodynamics
Power production from heat
Internal combustion engin