Achieving the Target Emission Rate (TER) and the Target Fabric Energy Efficiency (TFEE)

Appendix R of SAP 2012 provides a specification for a notional dwelling which meets the new standards.
If a dwelling is built conforming to Appendix R values it will beat the TER and also beat the TFEE by 15%.
It is however often not possible to conform to all the stipulated values on a specific project and it becomes necessary to compensate for shortcomings in one area with improvements in another.


APPENDIX R VALUES

Element or system Value
Size and shape As proposed dwelling
Opening areas Up to 25% of total floor area
External walls 0.18W/m2k
Party walls 0.00W/m2k
Floors 0.13W/m2k
Roofs 0.13W/m2k
Windows 1.4W/m2k
Thermal mass Medium (250KJ/m2K)
Ventilation System Natural (with extract fans)
Air permeability 5.00 m3/m2/hr@50 Pa
Heating system Mains gas, boiler and raiators
Boiler 89.5% (SEDBUK 2009) efficiency
Controls Time and temperature zone control
  Modulating boiler with interlock
  Weather compensation
Secondary heating None
Low energy lighting 100%
Air conditioning None
Thermal bridging Calculated using psi values in Table R2