We use the Passivhaus Planning Package (PHPP) which is the most sophisticated steady state method of calculating the Operational Energy or Energy Use Intensity (EUI) for a building in its actual location and including regulated and unregulated energy use to CIBSE TM54 requirements.
TM54 is a Technical Memorandum published by CIBSE, and addresses the growing awareness that buildings in operation do not always perform as the designers predicted. This can apply to both energy cost and emissions. These calculations can be used as a design tool to establish if the EUI is reaching the desired performance standard, whether that be:
LETI Net Zero Targets for different building types including Residential, Office or Schools
Passivhaus Classic, Plus or Premium
Passivhaus Low Energy
Enerphit for retrofit projects
AECB Building Standard
Using the variant function within PHPP we can consider Low, Medium and High range scenarios as required by TM54 to test issues such as increased utilisation or occupancy.
