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Home Insulation & U-Values

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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  1. Home Insulation & U-Values Noadswood Science, 2011

  2. Home Insulation & U-Values • To describe the effectiveness of insulation methods and to understand what an U-Value is

  3. 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)

  4. 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

  5. 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 (£)

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

  7. 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

  8. U-Values • The thicker the insulation the lower the u-value… • Look at the table below – plot the results on a suitable graph…

  9. U-Values • The data is continuous – requiring a line graph…

  10. Energy • Green loans – money saving over time…

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