Home Insulation & U-Values

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Presentation transcript:

Home Insulation & U-Values Noadswood Science, 2011

Home Insulation & U-Values Friday, September 29, 2017 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? 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 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

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

Low-e Glass & Argon Gas Cavity U-Values The effectiveness of insulation is measured using u-values – the lower the u-value the more effective the insulating material… Double Glazing U-Value Standard 2.8 Low-e Glass 1.8 Low-e Glass & Argon Gas Cavity 1.5 In this example the best double glazing is the low-e glass with argon gas cavity as it has the lowest u-value

Questions How can energy transfer be prevented from your house? What is a solar heating panel? How does it work? Complete the summary questions

U-Values The thicker the insulation the lower the u-value… Look at the table below – plot the results on a suitable graph… Insulation Thickness U-Value 60mm 0.46 70mm 0.41 80mm 0.37 90mm 0.34 100mm 0.30 110mm 0.26 120mm 0.23

Payback Time Work out the payback time for the following (remember payback time (years) = cost of insulation (£) ÷ savings per year in fuel costs (£) Method of insulation Cost (£) Savings per year (£) Payback time (years) Cavity wall insulation £350 £100 3.5 years Lost insulation £150 1 year Double glazing £5000 £200 25 years Insulation of hot water tank £60 £15 4 years Draught-proofing £50 3.4 years

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

Energy Green loans – money saving over time…