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**P1 – AQA 2011 P1.1. The Transfer of Energy Mr. J. McHugh**

U - values P1 – AQA 2011 P1.1. The Transfer of Energy Mr. J. McHugh J.McHugh

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**Learning Objectives To state what U-values are**

Evaluate the effectiveness of different types of material used for insulation, including U-values and economic factors including payback time J.McHugh

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What IS a U-value? Used in Europe to help architects choose building materials Tells us how well heat passes through a material The lower the U-value, the less heat passes through J.McHugh

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What does it mean? The energy that passes through is measured in WATTS ( 1W = 1J/s ) A U-value tells us how much energy passes through 1m2 of a material with a particular thickness The standard U-value looks at the energy transferred (W) where there is a 1°C temperature difference between the two sides of material Thus, the unit for a U-value is W/m2/°C J.McHugh

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**Using U-values Different materials have different U-values**

Energy lost can be calculated as E = U-value x area x temperature difference ( W/m2/°C ) (m2) (°C) J.McHugh

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**Old Single Glazing Old single glazed windows with a metal frame**

Typical U-value = 5.6 Area = 1m2 Inside Temp. = 20°C Outside Temp. = 10°C Calculate energy lost J.McHugh

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**Class Task Longman Worksheet P1a.2f – Calculating Energy Losses [H]**

J.McHugh

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**Homework Complete Keeping Warm worksheet**

Finish Calculating Energy Losses worksheet DUE: Wednesday December 8th J.McHugh

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P1b(ii) Keeping Homes warm

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