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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 1m 2 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/m 2 /°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/m 2 /°C ) (m 2 )(°C) J.McHugh

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Old Single Glazing Old single glazed windows with a metal frame Typical U-value = 5.6 Area = 1m 2 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 1. Complete Keeping Warm worksheet 2. Finish Calculating Energy Losses worksheet DUE: Wednesday December 8 th J.McHugh

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