As part of a ‘Whole building’ approach to decarbonising a building, the simplest way to reduce fuel consumption from a heating system is to ensure a building envelope is well insulated, and where infiltration and ventilation rates are controlled to the requirements for a comfortable and safe operation.

This tool is intended to offer guidance to Salix clients who are looking to complete a heat loss calculation for building fabric improvement projects. These include window replacements, and internal or external insulation improvements.

Thermal insulation standards are typically referred to as the thermal transmittance of the fabric (total heat transfer exchange). These are expressed in standard units called U-Values. This calculation uses the thermal improvement of a fabric's U-value to calculate a saving on heat loss through the fabric. The thermal transmittance improvements can then be applied to degree data and boiler efficiencies to calculate a seasonal saving on fuel (kWh).
 

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