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Detailed Baseline Energy Model via drawing.tool
Detailed Baseline Energy Model via drawing.tool

Default LPD, EPD, and Occupant density values controlled by the Room Template are now area-weighted average to baseline inputs

Patrick Chopson avatar
Written by Patrick Chopson
Updated over a week ago

Advanced customization and calibration of the Baseline Energy model is now possible via the drawing.tool. Each Room within the drawing.tool model can be assigned a template which will control the lighting power density (LPD), Appliance use (EPD) and occupant density. These values will be area-weighted averaged to populate calibrated, detailed values in the Baseline Energy Model. Assigning specific templates to rooms allows for further detail beyond what is captured with multi-use projects.

Additionally, if the envelope performance values (Roof R-value, Wall R-value, etc.) are customized inside the drawing.tool, then the baseline page will be automated with the area-weighted values. Here's a helpful summary that can be seen upon visiting the baseline page after exporting the model from the drawing.tool:

To utilize this new method of defining the Baseline Energy model inputs start with a single use project. Next, either import or draw your building directly in drawing.tool.

Each room will have a default template applied which can be changed based on the use type intended. When exporting from drawing.tool to analysis the values defined by the templates will be area-weighted averaged to the specific Baseline inputs. Here is an example of what is happening:

The values assigned by each of the Templates are listed in the tables below:

Some Important Notes:

  • The LPD values are referenced from ASHRAE 90.1 2013 space-by-space tables.

  • The EPD and occupant density values are referenced from ANSI/ASHRAE/IES 90.1 User's Manual.

  • The templates are connected directly to loadmodeling.tool! So for projects preforming system sizing via the tool there is no need to duplicate the work of assigning templates!

  • The area weight average method for building inputs can also be done by hand if preferred for a simple project, more information on the calculations are located here

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