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Home energy audit assignment HURRAY! – with some thermal transfer calculation DUE: 16 October 2016 Instructions on Building energy Auditing will be delivered on Oct 14 You will present your audit findings on Oct 16th

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Carry out your home energy audit Follow the checklist (on Moodle) Skip sections irrelevant to your households Use the energy audit data collection table (on Moodle) Calculate the U-values of your building envelope Use the science part of the class (slides) Use the catalog of insulation materials (on Moodle) Refer to advisory handbook for insulation (if you don’t know what your wall is) Recommend energy efficiency improvements Recalculate your envelope U-values after energy efficiency added Aim for no less than R= 2.2 m2·°C/W

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Lambda (λ) Thermal Conductivity The value of lambda λ (W/m. օC) = is the insulation value of the material. E.g.՝ Thermal conductivity of polystyrene W/mօC = 0.028 - 0.035 The lower the lambda, the higher the insulation worth of the material (mind the thickness).

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R-value. Thermal resistance Lambda values (λ), combined with information on the thickness of material, represent the thermal resistance of individual materials used in the building envelope, or their R-value. Thickness measured in m2·°C/W λ The higher the R-value, the better it resists the heat transfer. The cumulative thermal resistance of a mixed structure is comprised of individual R-values of the layers in the structure.

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Calculating U-Values Start by calculating the thermal resistances of each element (R-values). The R-value is the thickness of the product in metres ÷ Lambda (thermal conductivity). Add the R-values of all materials used in the application (including any air gaps) and calculate the reciprocal. The reciprocal = 1 ÷ total of all R-values Example: PIR Board 0.022 W/mK100mm thick + Glass Fibre Roll 0.044 W/mK100mm thick Total combined R-value = 4.54 + 2.27 = 6.81 m2K/W U-value = 1 ÷ 6.81 = 0.147 W/m2K