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№1 слайд![Home energy audit assignment](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img0.jpg)
Содержание слайда: 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
№2 слайд![Carry out your home energy](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img1.jpg)
Содержание слайда: Carry out your home energy audit
Follow the checklist (on Moodle)
https://www.ase.org/resources/home-energy-audit
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
№3 слайд![Lambda Thermal Conductivity](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img2.jpg)
Содержание слайда: 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).
№4 слайд![R-value. Thermal resistance](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img3.jpg)
Содержание слайда: 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.
№5 слайд![](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img4.jpg)
№6 слайд![Calculating U-Values Start by](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img5.jpg)
Содержание слайда: 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
№7 слайд![Efficient window features](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img6.jpg)
Содержание слайда: Efficient window features
№8 слайд![Features of Selected Window](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img7.jpg)
Содержание слайда: Features of Selected Window Types
№9 слайд![](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img8.jpg)
№10 слайд![](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img9.jpg)
№11 слайд![](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img10.jpg)
№12 слайд![](/documents_6/fb2824ba9d279d7a3a759cb9ad1f713e/img11.jpg)