The 2006 Target Emissions Rate [TER] for a new naturally ventilated non-dwelling equates to the total CO2 emissions from a notional equivalent 2002 building reduced by 23.5 per cent, Therefore under the flat approach, the 2010 TER would be 42.625 per cent below the emissions from a 2002 notional building. The 2006 TER for a new mechanically ventilated or air-conditioned non-dwelling equates to the total CO2 emissions from a notional equivalent 2002 building reduced by 28 per cent. Therefore under the flat approach, the 2010 TER would be 46 per cent below the emissions from a 2002 notional building.
Under the aggregate approach, the 2010 TER would be the emissions from a newly-defined notional building, with no improvement factors applied. The specifications for the notional building would be set such that new non domestic buildings on aggregate would achieve the national target of overall 25 per cent lower emissions than under the 2006 Part L. This means that the 2010 TER for certain new buildings may be more than 25 per cent lower than the 2006 TER for similar buildings.
For other buildings the 2010 TER may be less than 25 per cent lower than the 2006 TER for similar buildings. This approach reflects the fact that it is relatively straightforward in some building types to improve the energy performance by more than 25 per cent, whilst in other building types a 25 per cent improvement becomes much more difficult. For example, a warehouse that is mostly roof-lit would be different from an office which is side-lit.
SBEM is a software tool developed by BRE that provides an analysis of a building's energy consumption.
SBEM is used for non domestic buildings in support of the National Calculation Methodology (NCM) and the Energy Performance of Buildings Directive (EPBD). The tool helps to determine CO2 emission rates for new buildings in compliance with Part L of the Building Regulations [England and Wales] and equivalent Regulations in Scotland, Northern Ireland, the Republic of Ireland and Jersey. It is also used to generate Energy Performance Certificates for non-domestic buildings in construction, for sale or let.
It was developed by BRE for the Department for Communities and Local Government. The latest version of the SBEM tool and its accompanying user interface, iSBEM, can be downloaded free of charge from the dedicated National Calculation Method website at http://www.ncm.bre.co.uk/
For the "aggregate approach", Simplified Building Energy Model [SBEM] will contain different definitions of the notional building related to the amount and orientation of glazing - for example, side-lit for offices, top-lit through roof lights for warehouses and no glazing such as cinemas. The buildings will be in zones so may combine different elements of the glazing definition.
The Target Emissions Rate [TER] will vary based on what fuel is used so that most building will have comparable efficiency standards regardless of fuel used. There will no longer be an improvement factor; the software will generate a TER which the designer must equal or exceed. To establish the 2010 TER for the "flat approach", the 2006 TER is recalculated using the emission factors proposed for 2010.
The limiting value for the air permeability of buildings in Approved Document L2A remains as 10 m³/(h.m²) at a test pressure of 50 pascals. However, the National Calculation Methodology [NCM] will assume an air permeability of 5 m³/(h.m²) in the notional building and unless other energy saving measured are incorporated into the proposed building, then a design air permeability of less than 5 m³/(h.m²) may be required.