A Conceptual/Simplified Building Energy Modelling

Simple tool intended to help architects at the early design stage. Not all info is needed. The architect may focus on losses through walls, windows & balconies (thermal bridges) and gains from windows only, which have the highest impact & are more directly related to the architectural design. It may be used to model a typical floor in a multi-storey building, where the roof & ground have a negligible impact.
(Free to use at your own risk. No reproduction without permission)

Building location:

Calgary Chicago Cincinnati Edmonton London, UK Minneapolis Montreal New York City Ottawa Quebec City Seattle Toronto Vancouver

Help

Enter treated floor area:

Treated floor area in meters square

TFA:

Enter walls info:

Walls area in meters square and R-Value in metric (RSI-Value=R-Value/5.678). Group walls of similar/same properties

Wall #1:
Wall #2:
Wall #3:
Wall #4:
Wall #5:

Enter windows info:

Area in meters square and U-Value in metric (USI-Value=U-Value*5.678). The rest of the info applies to solar gains (Solar Heat Gain Coefficient (SHG), glazing fraction, reduction from shading, angle, dirt and orientation). Group windows of similar/same properties

Window #1: NorthEast South West
Window #2: NorthEast South West
Window #3: NorthEast South West
Window #4: NorthEast South West
Window #5: NorthEast South West
Window #6: NorthEast South West
Window #7: NorthEast South West
Window #8: NorthEast South West

Enter balconies info:

Length in meters and linear transmittance, PSI-Value, in metric (W/(mK)). Group balconies of similar/same properties

Balcony #1:
Balcony #2:
Balcony #3:
Balcony #4:
Balcony #5:

Enter ventilation info:

Volume of ventilated areas in meters cubic and energetically effective air changes (volume fraction per hour)

Volume #1:
Volume #2:

Enter internal gains info:

Area in meters square and gains (generated by people, equipment & lighting) in W/m2 (typical residential = 2.1)

Area #1:
Area #2:

Enter other thermal energy needs (DHW etc.):

Thermal energy needs in kWh/year.

DHW:
Other Losses:
Other Gains:



Calculate

Results:

Thermal Energy:
(kWh/year, kWh/m2/year)

Breakdown of losses and gains:

Wall Losses (kWh):
Window Losses (kWh):
Window Gains (kWh):
Balcony Losses (kWh):
Ventilation Losses (kWh):
Internal Gains (kWh):
DHW (kWh):
Other Losses (kWh):
Other Gains (kWh):


For questions and/or customized software: Email