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WHAT IS THIN MULTIFOIL INSULATION?
Definition
How does it work?
Measure of the thermal efficiency

WHY CHOOSE THIN MULTIFOIL INSULATION?
THE RANGE
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Measure of the thermal efficiency


1 / Traditional standard tests
2 / In situ measurement
3 / Application for European Technical Approval

1 / Traditional standard tests

In the 1960s a model for calculating the insulation of buildings was established by the scientific community.
This model relied on using the results from tests using a guarded hot box or a guarded hot plate, laboratory equipment original created for traditional, thick, single layer insulation. This laboratory equipment measures the thermal conductivity of these products at a steady state (in other words, a constant state), this means their capacity to prevent heat loss through conduction.

CONCEPT
The method consists in placing an insulation product between two environments at different temperatures to generate a temperature difference (ΔT). Then, the amount of energy needed to maintain a constant temperature either side of the insulator is measured. Once the thermal flow has stabilised, the measurement can be made. The quantity of energy equals the thermal flow passing through the product. This is the thermal conductivity. The thermal resistance or R value defined is a ratio between the thickness (e) & the thermal conductivity (λ) of an insulation product (R = e /(λ)).

Unlike traditional thick insulation - which mainly work to prevent heat exchange through conduction - the specific nature of thin multifoil insulation, combined with its application between two air gaps, forces energy to be transmitted via radiation rather than by conduction or convection. Heat exchange through conduction plays only a minor role in the way thin multi-foil reflective insulation works.

This single measurement for heat conductivity is not sufficient to categorise the overall thermal performance of thin multifoil insulation.






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