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## Energy in Thermal Processes

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### Chapter 11 Energy in Thermal Processes Temperature and heat Heat (Q): energy transferred between a system and its environment because of a temperature difference that ... – PowerPoint PPT presentation

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Title: Energy in Thermal Processes

1
Chapter 11 Energy in Thermal Processes
2
• Temperature and heat
• Heat (Q) energy transferred between a system
and its environment because of a temperature
difference that exists between them
• SI Unit Joule
• Alternative unit calorie (cal)

3
• Absorption of heat
• Specific heat (c) heat capacity per unit mass
• Common states (phases) of matter solid, liquid,
gas
• Latenet heat (L) the amount of energy per unit
mass transferred during a phase change (boiling,
condensation, melting, freezing, etc.)

4
Absorption of heat
5
Absorption of heat
6
Absorption of heat
7
Chapter 11 Problem 17
A 100-g aluminum calorimeter contains 250 g of
water. The two substances are in thermal
equilibrium at 10C. Two metallic blocks are
placed in the water. One is a 50-g piece of
copper at 80C. The other sample has a mass of 70
g and is originally at a temperature of 100C.
The entire system stabilizes at a final
temperature of 20C. Determine the specific heat
of the unknown second sample.
8
• Heat transfer mechanisms
• Thermal conduction
• Conduction rate
• Thermal resistance
• Conduction through a composite rod

9
• Heat transfer mechanisms

10
Chapter 11 Problem 36
A box with a total surface area of 1.20 m2 and a
wall thickness of 4.00 cm is made of an
insulating material. A 10.0-W electric heater
inside the box maintains the inside temperature
at 15.0C above the outside temperature. Find the
thermal conductivity k of the insulating
material.
11
• Heat transfer mechanisms
• Stefan-Boltzmann constant
• Absorption rate

12
Chapter 11 Problem 46
At high noon, the Sun delivers 1.00 kW to each
square meter of a blacktop road. If the hot
asphalt loses energy only by radiation, what is
its equilibrium temperature?
13
• Heat transfer mechanisms
• Convection

14
Heat transfer mechanisms
15
Questions?
16
Answers to the even-numbered problems Chapter 11
Problem 4 0.152 mm
17
Answers to the even-numbered problems Chapter 11
Problem 12 467 pellets
18
Answers to the even-numbered problems Chapter 11
Problem 16 1.7 kg
19
Answers to the even-numbered problems Chapter 11
Problem 20 49 kJ
20
Answers to the even-numbered problems Chapter 11
Problem 40 7.2 10-2 W/(m C)
21
Answers to the even-numbered problems Chapter 11
Problem 50 14.1 h