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.
We start with a Design PH model to calculate the areas of the thermal envelope, the building orientation and the shading provided by the surrounding buildings and landscape. This is then fed into the PHPP where additional information is added on fabric performance, occupancy, internal heat gains, ventilation, the space heating and hot water systems.
From this the PHPP calculates annual heating demand, peak heating load and EUI which we can then benchmark against targets such as
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 to test issues such as increased utilisation or occupancy.
