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  <a href="https://knowledge.nyserda.ny.gov/pages/viewpage.action?pageId=110723487">Durst: Case Study</a>
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Energy & Carbon Modeling



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body<p><br /></p>

 A calibrated energy model should play a central role in building out a decarbonization plan because it provides insights on:

  • Current building energy and carbon profiles, and costs
  • Potential energy, carbon and cost savings of energy conservation measures (ECMs)
  • The impact of groups of ECMs, and the order in which they should be implemented over time.

The steps to follow include:

  • An initial energy model is developed using commonly available building information such as architectural floorplans, MEP schedule sheets, and BMS sequences of operation. 
  • The initial model is then refined and “calibrated” to the building’s real utility data for each utility consumed, creating a baseline condition that ECM’s will be compared against. 
  • The baseline energy model is used as a test bed for individual ECMs to understand potential energy, carbon and cost impacts. 
  • Evaluate the financial performance of each ECM. These results will be used to identify strategies that are economically viable and should be considered further.  
  • Those ECMs that are economically viable on their own may be grouped together with other ECMs to help build a holistic business case for system optimization and maximum carbon reduction. 
  • During the evaluation process, the project team should take the evolving emission factors associated with utilities such as electricity and steam, as well as the impact of rising average and design day temperatures/humidity, into account.

Key outputs from the energy modeling workflow should include data driven charts showing energy end use breakdown and costs, carbon footprint of each utility, building carbon emissions vs. LL97 targets and fines, and who "owns" the carbon footprint (i.e. tenants, building operations).It is important to note that not all energy models are created equal. For a deep energy retrofit project, the accuracy of the energy model should align with ANSI/ASHRAE/IES Standard 90.1. Code or LEED energy models that were developed for the building in the past are not appropriate for this effort.  

You can learn more about building energy modeling here.

Below is a selection of the energy modeling software packages used to support the case study findings presented in this Playbook, and throughout the industry. 

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titleEnergy Modeling Software Packages

eQuestImage Added DesignBuilderImage Added DOE-2Image Added EnergyPlusImage Added OpenStudioImage Added


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