Home insulation u values
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Home Insulation & U-Values. Noadswood Science, 2011. Home Insulation & U-Values. To describe the effectiveness of insulation methods and to understand what an U-Value is. Energy Bills. Which of the following houses would you expect to have the highest energy bills?.

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Home Insulation & U-Values

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Home insulation u values

Home Insulation & U-Values

Noadswood Science, 2011


Home insulation u values1

Home Insulation & U-Values

  • To describe the effectiveness of insulation methods and to understand what an U-Value is


Energy bills

Energy Bills

  • Which of the following houses would you expect to have the highest energy bills?

  • The house on the right has the highest energy bills as it is wasting the most to the surroundings (as shown by the thermal image)


Reducing heat loss

Reducing heat loss

  • Reducing a homes heat loss saves a huge amount of energy and money – although this can be expensive initially the gains long time outweigh the initial offset…

  • Loft insulation

  • Double glazing

  • Cavity wall insulation

  • Draft excluders

  • Underlay and thick carpets

  • Insulation of pipes


Which method is best

Which method is best?

  • Which insulation method is best and how can you decide this?

  • Insulation cost / savings ratio is worked out using payback time – the amount of time it takes you to get your money back in savings…

    Payback time (years) = cost of insulation (£)

savings per year in fuel costs (£)


Payback time

Payback Time

  • Work out the payback time for the following (remember payback time (years) = cost of insulation (£) ÷ savings per year in fuel costs (£)


U values

U-Values

  • The effectiveness of insulation is measured using u-values – the lower the u-value the more effective the insulating material…

  • In this example the best double glazing is the low-e glass with argon gas cavity as it has the lowest u-value


U values1

U-Values

  • The thicker the insulation the lower the u-value…

  • Look at the table below – plot the results on a suitable graph…


U values2

U-Values

  • The data is continuous – requiring a line graph…


Energy

Energy

  • Green loans – money saving over time…


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