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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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