Measuring U-values of glass with greenTEG’s gSKIN® U-value KIT

flowiBuilding physics, gSKIN Heat Flux Sensor, u-value, U-Wert


Windows play an important role in the overall insulation of a building, as they are responsible for up to 20% of heat losses during winter. Therefore, replacing poorly insulated windows with windows of the latest standard can contribute to saving significant costs and energy. Determining which windows provide the most potential in cost savings can be a daunting task, as the U-value of windows may range from 5 W/m²K for single glazed windows to 0.7 W/m²K for triple glazed windows. Oftentimes, the exact U-value of a given is unknown as the U-Value may also deteriorate over time (e.g. by leakage).

U-value_measurement on windowWith greenTEG’s gSKIN® U-Wert Kit, the U-value of windows can be assessed efficiently. The user now has a tool, where all the information needed for a precise cost-benefit analysis for window replacement is provided.
Thermal behavior of glass differs from that of walls and because of that, a different measurement approach is required. Measurements should be conducted approximately one hour after sunset and stopped before sunrise, to avoid the effects of solar radiation, in order for results to be conform to ISO 9869 standard. Furthermore, it requires a measurement interval over three subsequent nights and results not differing more than by 5%.

To download our full case study of a window U-value measurement click here.

In order to minimize the analytical effort of the user, greenTEG provides a template that enables ISO-conform measurements without the need of interrupting the measurement process. This excel template can be found here.

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