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1
CHAPTER 2bCHAPTER 2b
ENERGY, ENERGY TRANSFER
& GENERAL ENERGY
ANALYSIS
ENERGY, ENERGY TRANSFER
& GENERAL ENERGY
ANALYSIS
2
CONTENTSCONTENTS
 Forms of Energy
 Energy Transfer by Heat
 Energy Transfer by Work
 Mechanical Forms of Work
 The First Law of Thermodynamics
 Energy Conversion Efficiencies
3
LESSON OBJECTIVESLESSON OBJECTIVES
At the end of this lesson, you should be
able to:
 State the First Law of Thermodynamics
 Explain the conservation of energy principle
(Energy Balance)
4
Energy BalanceEnergy Balance
The net change (increase or decrease) in the total energy of the
system during a process is equal to the difference between the
total energy entering and the total energy leaving the system
during that process.
CONSERVATION OF ENERGYCONSERVATION OF ENERGY
5
Energy Change of a System,
Esystem
Energy Change of a System,
Esystem
Total Energy = sum of internal, kinetic, and potential energy changes
6
Closed System Energy BalanceClosed System Energy Balance
In a process of a closed system the energy of the system
increases and decreases by an amount equal to the
amount of energy transferred across its boundary
WQEE  12
(kJ)
Change in Energy
of the system
Net amount of
heat transfer in
Net amount of
work transfer out
= -
WQPEKEU  
7
RATE OF ENERGY TRANSFERRATE OF ENERGY TRANSFER
(kJ)
The energy balance can then be expressed compactly as:
Or in a rate form:
Or on a unit mass basis:
8
EXAMPLESEXAMPLES
A closed system containing 20 kg of air undergoes a process in
which there is a heat transfer of 1000 kJ from the system to the
surroundings. The work done on the system is 200 kJ. If the initial
specific internal energy of the system is 300 kJ/kg, what is the
final specific internal energy? Neglect KE and PE. (260 kJ/kg)
9
Class TakeawayClass Takeaway
1. For any system, the first law can be written as:
a. ____________________________ (kJ) or,
b. ____________________________ (kJ/kg) or,
c. ____________________________ (kW)
2. Fill in the blank spaces in the table.
Process Q W E1 E2 E
A +50 -20 +50
B +50 +20 +20
C -40 +60 +20
D -90 +50 0
E +50 +20 -100
10
Summary of Chapter 2Summary of Chapter 2
 Forms of energy
 Macroscopic = kinetic + potential
 Microscopic = Internal energy (sensible + latent +
chemical + nuclear)
 Energy transfer by heat
 Energy transfer by work
 Mechanical forms of work
 The first law of thermodynamics
 Energy balance
 Energy change of a system
 Mechanisms of energy transfer (heat, work, mass flow)

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Chap2b jan13

  • 1. 1 CHAPTER 2bCHAPTER 2b ENERGY, ENERGY TRANSFER & GENERAL ENERGY ANALYSIS ENERGY, ENERGY TRANSFER & GENERAL ENERGY ANALYSIS
  • 2. 2 CONTENTSCONTENTS  Forms of Energy  Energy Transfer by Heat  Energy Transfer by Work  Mechanical Forms of Work  The First Law of Thermodynamics  Energy Conversion Efficiencies
  • 3. 3 LESSON OBJECTIVESLESSON OBJECTIVES At the end of this lesson, you should be able to:  State the First Law of Thermodynamics  Explain the conservation of energy principle (Energy Balance)
  • 4. 4 Energy BalanceEnergy Balance The net change (increase or decrease) in the total energy of the system during a process is equal to the difference between the total energy entering and the total energy leaving the system during that process. CONSERVATION OF ENERGYCONSERVATION OF ENERGY
  • 5. 5 Energy Change of a System, Esystem Energy Change of a System, Esystem Total Energy = sum of internal, kinetic, and potential energy changes
  • 6. 6 Closed System Energy BalanceClosed System Energy Balance In a process of a closed system the energy of the system increases and decreases by an amount equal to the amount of energy transferred across its boundary WQEE  12 (kJ) Change in Energy of the system Net amount of heat transfer in Net amount of work transfer out = - WQPEKEU  
  • 7. 7 RATE OF ENERGY TRANSFERRATE OF ENERGY TRANSFER (kJ) The energy balance can then be expressed compactly as: Or in a rate form: Or on a unit mass basis:
  • 8. 8 EXAMPLESEXAMPLES A closed system containing 20 kg of air undergoes a process in which there is a heat transfer of 1000 kJ from the system to the surroundings. The work done on the system is 200 kJ. If the initial specific internal energy of the system is 300 kJ/kg, what is the final specific internal energy? Neglect KE and PE. (260 kJ/kg)
  • 9. 9 Class TakeawayClass Takeaway 1. For any system, the first law can be written as: a. ____________________________ (kJ) or, b. ____________________________ (kJ/kg) or, c. ____________________________ (kW) 2. Fill in the blank spaces in the table. Process Q W E1 E2 E A +50 -20 +50 B +50 +20 +20 C -40 +60 +20 D -90 +50 0 E +50 +20 -100
  • 10. 10 Summary of Chapter 2Summary of Chapter 2  Forms of energy  Macroscopic = kinetic + potential  Microscopic = Internal energy (sensible + latent + chemical + nuclear)  Energy transfer by heat  Energy transfer by work  Mechanical forms of work  The first law of thermodynamics  Energy balance  Energy change of a system  Mechanisms of energy transfer (heat, work, mass flow)