Physics P1 1.9 Heating and insulating buildings.

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What do U-values tell us?
U-values tell us how much energy per second passes through diffeHorent materials.
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How can we find out how good materials are as an insulator through U-values?
The lower the U-value the better the material is as an insulator.
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What do most people want to do to reduce fuel bills?
Minimise the rate of energy transfer out of their homes.
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How can the rate of energy transfer out of homes be minimised to reduce fuel bills?
By fitting fibreglass loft insulation, cavity wall insulation, double glazing, draught proofing and aluminium.
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How does fibreglass loft insulation minimise the rate of energy transfer out of homes?
By reducing energy transfer by conduction.
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How does cavity wall insulation minimise the rate of energy transfer out of homes?
It traps air in small pockets to reduce energy transfer by convection.
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How does double glazing minimise the rate of energy transfer out of homes?
It reduces energy transfer by conduction through windows.
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How does draught proofing minimise the rate of energy transfer out of homes?
It reduces energy transfer by convection.
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How does aluminium foil behind radiators minimise the rate of energy transfer out of homes?
It reflects infrared radiation back into the room.
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How do solar heating panels work?
They contain water that is heated by radiation from the Sun.
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How is the water heated in solar panels used?
It may be used to heat buildings or provide domestic hot water.
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What are the benefits of solar panels?
They are cheap to use because they do not use fuel.
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What does knowing the U-value of different materials allow us to do?
Compare them.
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What can the water heated in the solar heating panels be used for?
To heat buildings or provide domestic hot water.
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What is the disadvantage of solar heating panels?
They are expensive to by and install and the water is not heated at night.
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Why is fibreglass a good insulator?
Fibreglass is a good insulator because it contains trapped air.
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Why are the pipes that contain the water in a solar heating panel often painted black?
The pipes that contain the water in a solar heating panel are often painted black because black is the best absorber of radiation.
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**BE PREPARED TO LOOK AT TABLES OF U-VALUES AND DECIDE WHICH WOULD BE THE BEST MATERIAL TO USE IN A PARTICULAR SITUATION**
**YOU MAY ALSO HAVE TO TAKE INTO ACCOUNT OTHER THINGS SUCH AS COST-EFFECTIVENESS AND PAYBACK TIME**
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Other cards in this set

Card 2

Front

How can we find out how good materials are as an insulator through U-values?

Back

The lower the U-value the better the material is as an insulator.

Card 3

Front

What do most people want to do to reduce fuel bills?

Back

Preview of the front of card 3

Card 4

Front

How can the rate of energy transfer out of homes be minimised to reduce fuel bills?

Back

Preview of the front of card 4

Card 5

Front

How does fibreglass loft insulation minimise the rate of energy transfer out of homes?

Back

Preview of the front of card 5
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