Heat Transfer Quiz

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Questions and Answers

What process primarily involves the transfer of heat through direct contact in solids?

  • Radiation
  • Conduction (correct)
  • Insulation
  • Convection

Which type of materials are considered good insulators?

  • Metals
  • Copper
  • Fiberglass wool (correct)
  • Water

What occurs in a substance when heat energy causes particles to move faster and further apart?

  • Convection (correct)
  • Expansion
  • Conduction
  • Radiation

Which statement accurately describes radiation?

<p>Can travel through empty space. (A)</p> Signup and view all the answers

What is the primary reason metals are considered good conductors of heat?

<p>They contain many free electrons. (A)</p> Signup and view all the answers

How does a larger temperature difference affect the rate of heat transfer?

<p>It increases the rate of heat transfer. (C)</p> Signup and view all the answers

What is the purpose of cavity wall insulation?

<p>To reduce heat loss by conduction. (D)</p> Signup and view all the answers

What is the formula used to calculate payback time for insulation methods?

<p>Payback time = $ rac{installation \ ext{ cost}}{annual \ ext{ savings}}$ (A)</p> Signup and view all the answers

Flashcards

Conduction

Heat transfer through direct contact, primarily in solids.

Convection

Heat transfer in fluids (liquids and gases) due to density differences.

Insulation

Materials that reduce heat transfer (conduction, convection) by creating barriers.

Radiation

Heat transfer through electromagnetic waves, can travel through a vacuum..

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Payback Time (Insulation)

The time it takes for the savings from insulation to equal the installation cost.

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Temperature Difference

Larger temperature difference results in faster heat transfer.

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Heat Transfer

The process of heat moving from a hotter object to a colder object

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Good Conductor of Heat

Materials that allow heat to pass through easily

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Study Notes

Heat Transfer

  • Heat always transfers from hot to cold
  • The rate of heat transfer depends on the material (solid, liquid, gas, or vacuum) and the difference in temperature

Conduction

  • Occurs in solids
  • Heat energy causes particles to vibrate more
  • Energy is transferred from one particle to another as they collide
  • Metals are good conductors because they have free electrons that quickly move energy from hot to cold

Convection

  • Occurs in liquids and gases
  • Heat energy causes particles to move faster and further apart
  • This creates less dense particles that rise
  • Denser particles sink
  • This creates convection currents

Radiation

  • All warm objects emit heat radiation in the form of infrared waves
  • Hotter objects emit more radiation than colder ones
  • Radiation can travel through solids, liquids, gases, and a vacuum
  • Black surfaces absorb radiation best
  • Shiny surfaces reflect radiation best

Insulation

  • Air is a poor conductor because of the gaps between particles
  • Loft insulation (fibreglass wool) reduces conduction by trapping air
  • Double glazed windows reduce conduction by trapping air between layers of glass
  • Stopping draughts reduces convection currents by preventing cold air from entering and hot air from escaping
  • Floor insulation (fibreglass wool) reduces conduction by trapping air
  • Cavity walls reduce conduction by trapping air between layers of bricks

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