Interpretations and Guidance

2013 DC Commercial Energy Conservation Code

Performance Pathway Guidance

The energy code has multiple compliance options for project teams.  In addition to the standard options offered in the code, DCRA has created two new pathways to lighten the administrative burden for project teams already using an energy model to show compliance with a 3rd party green building program (e.g. LEED, Enterprise Green Communities). A project team may now submit the same energy model they use to show compliance for a 3rd party green building program to show minimum energy code compliance, provided that the project teams exceed a minimum threshold above the ASHRAE Appendix G method as follows...

  1. Energy model 18% better than ASHRAE 90.1-2007 Appendix G
  2. Energy model 5% better than ASHRAE 90.1-2010 Appendix G

Energy Modeling Guidance

There are many types of energy modeling software that may be used to show compliance with the Energy Code. DCRA requires that the project teams provide sufficient input and output documentation for the baseline and proposed spaces to document the weather location, envelope, mechanical, electrical, plumbing systems, costs, and energy usage for comparing the model to the drawings. Below are two common software programs used by energy modelers and the reports requested for each.

  • eQuest Reports: SV-A, PV-A, BEPU, ES-D, LV-H, LV-I
  • Trane Trace Reports: ASHRAE 62.1 Ventilation, Building Areas, Building U-Values, Economic Information, Energy Cost Budget, Library Members, Plant Information, Entered Values, System Information, Walls by Direction, LEED Summary Report (if applicable)

2013 DC Residential Energy Conservation Code 

Heating and Cooling System

Section R403.2.2.1 - Sealed air handler. Air handlers shall have a manufacturer’s designation for an air leakage of no more than 2 percent of the design air flow rate when tested in accordance with ASHRAE 193.

  • Where the use of an ENERGY STAR certified heating and cooling system is clearly specified on the project plans, R403.2.2.1 is deemed to comply.

Section R403.6 - Equipment Sizing:  Heating and cooling equipment shall be sized in accordance with ACCA Manual S based on building loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies.

  • Manual J and S are not required under certain conditions.  To learn more please read the following document (download here)

 

Questions or suggestions?  Email green.building@dc.gov