EnerSys recently developed representative energy performance models in support of the City of Vancouver’s (City’s) Rezoning Policy for Sustainable Large Developments. For a previous iteration, we had developed models following different rezoning policies, based on the 2007 version of the ANSI/ASHRAE/IESNA 90.1 Standard (ASHRAE 90.1). In Spring 2014, the City wanted these updated to reflect requirements which stipulated (1) compliance with the ASHRAE 90.1-2010 Standard and (2) attaining at least six Energy and Atmosphere Credit 1 (EAc1) points under the LEED Canada NC 2009 rating system.
After developing the applicable models based on previous recent City studies, the City implemented a new rezoning policy. The new policy now dictates that new construction demonstrate at least 22% energy cost savings based on one of the following energy performance modelling protocols:
- ANSI/ASHRAE/IESNA Standard 90.1-2010 Appendix G: Performance Rating Method (Appendix G),
- ANSI/ASHRAE/IESNA Standard 90.1-2010 Section 11: Energy Cost Budget Method (ECB),
- National Energy Code of Canada for Buildings 2011 Section 8: Building Energy Performance Compliance Path (NECB).
Note that each of these protocols are slightly modified based on 2014 Vancouver Building Bylaw special requirements, as posted on its web site. (Note that the modified NECB protocols happen to align with LEED v4 requirements.) Moreover, meeting the rezoning requirements differs from simply demonstrating Code compliance for other developments. For instance, Appendix G may be used (similar to LEED). Also, the NECB approach must apply utility rates to determine the relative energy cost savings, instead of simply demonstrating a lower energy consumption.
With the permission of the City of Vancouver, the normalized comparative results from this study, by end-use and energy source costs, are provided from Curt Hepting. In addition, he has provided a detailed summary of the model characteristics applied for:
- ASHRAE 90.1-2010 code-compliant proposed cases,
- modifications to these cases to satisfy the City’s past and present rezoning requirements for (a) 6 EAc1 LEED 2009 points and (b) 22% energy cost savings, respectively, and
- applicable characteristics that apply to the various comparative baselines.