Facade Technologies

Facades account for almost 50% of the thermal loads in buildings in the tropics. Excellent optical and thermal properties are necessary, and given the trend for fully glazed buildings, windows and fully-glazed curtain wall systems are of particular importance.

Our current services for industry and opportunities for collaborative research include:

Measurement of luminous and solar characteristics of architectural glazing

  • Spectral transmittance/reflectance of glazing is measured with UV-VIS-NIR spectrohotometer
  • Emissivity of glazing is determined with Fourier Transform Infrared (FTIR) Spectroscopy
  • Glazing system luminous and solar characterisatics calculated and reported include:

    • Visible light transmittance (VLT)
    • Visible light reflectance (VLR)
    • Solar transmittance (ST)
    • Solar heat gain coefficient (SHGC or G-value)
    • Shading coefficient (SC)
    • Thermal transmittance (U-value)
    • UV transmittance (UVT)
    • Colour rendering index (CRI)
  • The test method is in compliance with EN410:2011, ISO 9050:2003 or NFRC 300-2010.

Calorimetric measurements

of fenestration system thermal transmittance (U-value) and solar heat gain coefficient (SHGC or G-value)

  • Heat transfer through fenestration system, due to indoor/outdoor temperature difference or solar radiation, is directly measured using calorimetric method.
  • U-value can be determined under either winter or summer environmental condition.
  • The sample fenestration system could be building integrated photovoltaics (BIPV) insulating glazing unit (IGU), window system (with frames and/or with shading devices), door system or curtain wall system.
  • U-value test is in compliance with ISO 12567 - 1:2010 or ASTM C1199-09
  • G-value test is in compliance with SERIS in-house procedure, which is based on ASTM C1363-11, C1199-09 and NFRC 201-2010.

The calorimeter at SERIS is designed in compliance with the International standard ASTM C1363 (Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus) and NFRC 102 (Test Procedure for Measuring the Steady-State Thermal Transmittance of Fenestration Systems) of the US National Fenestration Rating Council.


of fenestration system thermal transmittance (U-value), solar heat gain coefficient (SHGC or G-value) and visible light transmittance (VLT)

  • Window/door system with frames and shading devices are simulated as a system
  • Centre-of-glazing U-value/G-value, edge-of-glazing U-value and frame U-value/G-value are calculated and reported separately
  • WINDOW and THERM software developed by Lawrence Berkeley National Laboratory (LBNL) is used for the simulation
  • The simulation method is in compliance with ISO 15099:2003. NFRC boundary conditions are optional

For further information, please contact:

Dr Thomas REINDL
Acting Head, High Performance Facades Group