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2 marksHeat Transfer

CAPE Physics Unit 1 · 2014 · Paper 2 · Question 6(b)(ii)

The thermal conductivity of the brick is 0.48 W m⁻¹ K⁻¹ and that of the foam is 0.016 W m⁻¹ K⁻¹.

Calculate the thickness of brick which would have the same insulating effect as 5 cm of foam.

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Other parts of this question

  1. 6(a)Discuss how the principles of conduction, convection, radiation and the greenhouse effect are applied in the design of this type of solar panels.[7 marks]
  2. 6(b)(i)Sketch a graph to show how the temperature would vary across the wall.[3 marks]
  3. 6(b)(iii)Determine the rate at which heat energy would pass through each square metre of this composite wall.[3 marks]

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