Interpretations and Guidance

The Green Building Division has provided training and guidance for Third Party Plan Review and Inspection Agencies regarding the DC Green and Energy Codes. Content can be reviewed here.  

2013 DC Commercial Energy Conservation Code

Performance Pathway Guidance

The energy code has multiple compliance options for project teams.  Additionally, DCRA has created two new pathways for project teams to show compliance when using an energy model for 3rd party green building programs. (e.g. LEED, Enterprise Green Communities) A project team may submit the same 3rd party energy model to demonstrate energy code compliance, provided the model exceeds ASHRAE Appendix G standards 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, LV-B,LV-C, BEPS,ERV Energy Recovery Summary

  • Trane Trace Reports: ASHRAE 62.1 Ventilation, Building Areas, Building U-Values, Economic Information, Energy Cost Budget, Library Members, Plant Information, Entered Values, System Component Selection Summary, Psychrometric, Room Checksums, Walls by Direction, LEED Summary Report (if applicable)

2013 DC Residential Energy Conservation Code 

  • New systems must meet the requirements of Systems - Section R403.

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.

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.

NOTE: A Manual S Report must accompany the Manual J Report.

  • Section R403.6 is not required for HVAC units that are at a nominal maximum size of 1.5 tons (18,000btuh). Although not required, a load calculation is recommended to establish room by room air flow rates.

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