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Environmental Building Physics: Heat transfer through the building envelope · Modes of Heat Transfer

How conduction, convection and radiation move heat through walls, roofs and windows, and how building materials resist each one.

Environmental Building Physics · 26 questions

Try 3 questions

1. What are the three ways heat moves through and around a building?

  1. Convection, evaporation and absorption
  2. Conduction, insulation and reflection
  3. Conduction, convection and radiation
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Answer: Conduction, convection and radiation

Heat travels through solids by conduction, is carried by moving fluids such as air by convection, and crosses space as infrared waves by radiation.

2. What is conduction?

  1. Heat passing through matter by particle contact
  2. Heat traveling as infrared waves
  3. Heat carried along by moving air or water
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Answer: Heat passing through matter by particle contact

In conduction, energetic particles pass energy to their neighbors, so heat moves through a material without the material itself flowing.

3. On a cool morning, a metal handrail feels colder than a wooden one beside it. Why?

  1. Metal conducts heat away from skin faster
  2. The metal is at a lower temperature
  3. Wood gives off a little heat of its own
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Answer: Metal conducts heat away from skin faster

Both rails sit at the same air temperature. Metal's high conductivity draws heat from your hand much faster, which your skin reads as colder.

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