Physics 1A - Energy: Energy Efficiency in the Home 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: ex-JohnsonfamilyCreated on: 23-03-15 12:16 What are the most effective methods of insulation? Ones that give you the biggest annual saving. 1 of 12 How do you figure out payback time? Initial Cost / Annual Saving. 2 of 12 What does insulation do? Reduces heat loss from homes. 3 of 12 What is loft insulation? A thick layer of fibreglass wool is laid out across the whoel loft floor. 4 of 12 Why use loft insulation? It reduces conduction and radiation into the roof space from the ceiling. 5 of 12 What is cavity wall insulation? Foam is squirted into the gap between the bricks. 6 of 12 Why use cavity wall insulation? It reduces convection and radiation across the gap. 7 of 12 What is a hot water tank jacket? Insulating materials, e.g. fibreglass wool, reduce conduction and radiation. 8 of 12 Heat transfers faster through materials with higher or lower U-valus? Higher. 9 of 12 The better the insulator... ...the lower the U-value. 10 of 12 What is the u-value of a duvet? About 0.75 W/m2K. 11 of 12 What is the u-value of loft insulation material? Around 0.15 W/m2K. 12 of 12
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