Dynamic Insulation reduces heat loss from Linear Thermal Bridges

An issue of increasing importance for energy-efficient buildings is the heat loss caused by linear thermal bridging within the construction. Dynamic insulation reduces the heat loss caused by linear thermal bridging at junctions in proximity to dynamic air channels. The School of Engineering and Built Environment at Glasgow Caledonian University has developed a methodology for calculating the Dynamic ψ values of thermally bridged junctions.

As the standards for thermal performance become increasingly stringent, minimising the heat lost through thermally bridged junctions (typically at junctions between elements) is becoming increasingly important.

The heat loss through each thermally bridged junction is described by a linear thermal transmittance value, or ψ value (Psi value). A heat loss parameter attributable to bridging is then produced by summing the ψ values for a dwelling, which is then divided by the total dwelling envelope area to produce a Y value (W/m2 K).

Improving Accredited ψ-values through the Dynamic Effect

Dynamic insulation reduces the heat loss caused by linear thermal bridging at junctions in proximity to dynamic air channels. The School of Engineering and Built Environment at Glasgow Caledonian University, in conjunction with Energyflo has developed a methodology for calculating the Dynamic ψ values of thermally bridged junctions. 

In the first instance, this calculation methodology has been applied to APA and TRADA accredited details using the appropriate dynamic insulation products. Using the calculation methodology, Energyflo's engineering team calculated that the impact of the dynamic effect on the Y value for a dwelling is a reduction in the range 0.003 to 0.01W/m2K depending on the dwelling type, dynamic insulation coverage and dynamic insulation product chosen, further reducing the DER for a dwelling by 0.2-0.3kgCO2/m2 pa.

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