Using IESVE to calculate Thermal Energy Demand Intensity (TEDI)

Thermal Energy Demand Intensity (TEDI) is a metric used to determine a building’s performance by measuring the amount of heating output from all heating equipment for space and ventilation conditioning, per unit of modelled floor area.  TEDI is reported in kWh/m²a, where a is per annum.

TEDI is a Canadian local government performance metric, such as British Columbia’s Step Code and Vancouver’s Energy Modelling Guidelines v2; and Toronto’s Green Standard (TGS). However, it is not yet a target metric for NECB compliance.

A custom variable can be created in IESVE’s VistaPro module to calculate and analyze your project’s TEDI. By either right-clicking on an existing variable and selecting “Create Custom Variable” or using the VistaPro’s drop menu, the custom variable window will pop up.

Once this is open, you may select from the list of the existing variables in VistaPro to create your own custom variable.

TEDI = (ApHVAC room units heating load + ApHVAC heating coils load) / conditioned floor m²)

When the list is populated with your required variables for TEDI, you create formulas much like you would in Excel. Your modelled floor area will have to be entered manually in your formula dialogue box (1417 in this example) and multiplied by 1000 if you wish to have your units match those displayed in your output (MWh). Heat Pumps and other heat transfer equipment, as well as renewables, are not included in the TEDI.