Podcast
Questions and Answers
What method of heat transfer occurs when heating one end of a copper pipe and the heat travels to the other end?
What method of heat transfer occurs when heating one end of a copper pipe and the heat travels to the other end?
- Convection
- Convection and conduction
- Radiation
- Conduction (correct)
Which of the following materials is considered a good thermal conductor?
Which of the following materials is considered a good thermal conductor?
- Polystyrene
- Still air
- Wood
- Copper (correct)
In which situation is convection primarily occurring?
In which situation is convection primarily occurring?
- Heating a stiff metal rod
- Heat radiating from a fireplace
- An insulated wall retaining heat
- Water heating in a DHWC (correct)
What is the main characteristic of radiation as a method of heat transfer?
What is the main characteristic of radiation as a method of heat transfer?
What happens to the temperature of air in a room when heated by convection?
What happens to the temperature of air in a room when heated by convection?
Why is it important to insulate hot water cylinder pipes?
Why is it important to insulate hot water cylinder pipes?
What is a characteristic of materials that are good thermal conductors?
What is a characteristic of materials that are good thermal conductors?
What properties does the heat transfer method known as convection rely on?
What properties does the heat transfer method known as convection rely on?
Flashcards
Conduction
Conduction
Heat travels from one molecule to the next within a material. Example: Heating a copper tube to solder.
Convection
Convection
Heat transfer through the movement of fluids or gases. Example: Hot air rising and cool air falling in a room.
Radiation
Radiation
Heat transfer through infrared light, without heating the space between objects. Example: The sun warming the Earth.
Good Thermal Conductor
Good Thermal Conductor
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Bad Thermal Conductor
Bad Thermal Conductor
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Insulator
Insulator
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Temperature
Temperature
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Heat Retention
Heat Retention
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Study Notes
Lesson Intent
- Students will be able to describe different heat transfer principles.
- Students will be able to identify situations where different heat principles occur in a system.
- Students will be able to distinguish between best materials for heat conduction.
Principles of Heat
- Heat transfer occurs through three methods: conduction, convection, and radiation.
Conduction
- Conduction is when heat travels through a material, from one molecule to the next.
- Copper is a good thermal conductor.
- Plastics are not good thermal conductors.
- The faster heat travels, the better the conductor.
Convection
- Convection occurs in fluids (liquids and gases).
- Heated molecules rise, and cooler molecules fall.
- This creates a cycle of heat transfer.
- This is how a hot water cylinder works.
Radiation
- Radiation is heat transfer via infrared light.
- Heat is transferred from one body to another without heating the space between.
Heat Transfer Measurement
- Heat is measured in degrees Celsius (°C) or Kelvin (K).
Heat Transfer Control
- Heat needs to be retained in some situations, and emitted in others; this must be controlled.
- Hot water cylinder pipes need insulation to prevent heat loss.
- White colours reflect heat, while dark colours absorb heat.
Building Regulations for Heat Control
- Programmers: Use heat only when needed.
- Boiler stat: Primary circuit temperature is maintained.
- Cylinder stat: Secondary circuit temperature is maintained below 60°C.
- Room stat: Set temperature as low as possible.
- TRVs: Control individual room temperatures.
- Zones: Upstairs and downstairs temperatures are separately controlled.
Check Your Knowledge
- What is conduction?
- What is convection?
- What is radiation?
- What metal is the best conductor of heat? (Copper)
- What is heat transfer?
Traffic Light System
- Red: Did not understand the content well (Write down two questions).
- Amber: Understood effective questioning (Write one question).
- Green: Understood all of the content (Write one example).
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