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T101 Thermal performance

Window energy rating. T101 Thermal performance. Energy rating schemes. NFRC National Fenestration Rating Scheme, USA BFRC British Fenestration Rating Scheme EWERS European Window Energy Rating Scheme. FENSA. FEN estration S elf A ssessment Approved by ODPM as complying with Part L1

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T101 Thermal performance

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  1. Window energy rating T101 Thermal performance

  2. Energy rating schemes • NFRC • National Fenestration Rating Scheme, USA • BFRC • British Fenestration Rating Scheme • EWERS • European Window Energy Rating Scheme T101-2006

  3. FENSA • FENestration Self Assessment • Approved by ODPM as complying with Part L1 • Self certification by dealer/installer • Administered by the GGF T101-2006

  4. FENSA • Self certification • Frame type • Thermal break • Low e-coatings • Gas filling • Part L1 U-values T101-2006

  5. Part L2 2002 T101-2006

  6. Part L2 2002 T101-2006

  7. Part L2 2002 T101-2006

  8. NFRC • Operating for 15 years in the USA • Rating scheme showing; • U-value • Solar Heat Gain Coefficient • Air leakage • Factors combined differently for different climates T101-2006

  9. NFRC • 6 climatic regions cover USA • Heating climates • Cooling climates • Sunny climates T101-2006

  10. Air leakage U-value SHGC Light transmittance NFRC T101-2006

  11. BFRC • Independent UK body • Spun out of UK Government funded research • Partners were Trade Associations, Laboratories, Analysts and Universities • Establishing links in Europe • May feature in the next version of the Building Regulations T101-2006

  12. BFRC rating • Takes account of; • U-value Conduction, convection, radiation • SHGC Solar Heat Gain Coefficient • Air leakage Air leakage at 50Pa, L50 T101-2006

  13. Original BFRC label T101-2006

  14. BFRC rating • DWERS • Domestic Window Energy Rating Scheme • Ratings in the range G - A • A is most energy efficient, DWER > 0 • Today’s good windows normally fall in band C, -20 < DWER < -10 T101-2006

  15. DWER • DWER = 218.6 x Window Solar factor – - 68.5 x (Window U-value + Air infiltration factor) • Factors of 218.6 and 68.5 recognise the influence of Window Solar factor, U-value, and air leakage in the UK • Windows will perform differently in different UK climates but will always be ranked consistently T101-2006

  16. BFRC rating • Separate values given for: • Window U-value, Uw • Window solar factor, gwindow • Window air infiltration factor, 0.0165L50 To allow for fuller consideration T101-2006

  17. Light transmittance • A good DWER can be achieved by selecting right SHGC • This can be achieved by using a tinted glass • Heavily tinted glass will affect light levels in a building and may lead to an increased energy use for artificial lighting • The light transmittance value is given to allow specifiers to avoid this problem T101-2006

  18. EWERS • European Window Energy Rating Scheme • Adopted in Denmark • Uses scale of A,B,C,D,E • Similar to rating schemes for domestic appliances • May be taken up in UK with BFRC as the operating agent • Will use a common label but each state will set its own classification on the basis of climate and window styles! T101-2006

  19. EWERS labelling T101-2006

  20. Linking rating to regions T101-2006

  21. BFRC rating label T101-2006

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