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Environmental System Science November 18, 2009

Identifying Energy Conservation Measures. Tailoring Retro-commissioning to meet your needs. Sarah Boll Office of Sustainability. Environmental System Science November 18, 2009. Overview.

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Environmental System Science November 18, 2009

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  1. Identifying Energy Conservation Measures. Tailoring Retro-commissioning to meet your needs Sarah Boll Office of Sustainability Environmental System Science November 18, 2009

  2. Overview - What is an Energy Conservation Measure (ECM)- Developing your Scope of Work for a Retro-commissioning- Energy Audits – the basics- When to use an audit or a retrocommissioning- How to achieve your desired outcome.

  3. What is an energy conservation measure? • A defined action you can take that will reduce the energy use in a building, examples: • Using the BMS to put in schedules for major equipment and lighting. • Installing a variable frequency drive (VFD) on electrical motors. • Testing, Adjusting and Balancing (TAB) if equipment found to be performing out of current specifications.

  4. Example of findings from RCx ECM: improve BMS in order to increase ability to schedule equipment. Est cost: $500,000 Est utility savings: $187,000/ yearSimple Payback: 2.67 years

  5. What will an RCxA look at? 1. Heating and cooling systems2. Air handling/air distribution systems3. Hydronics distribution systems4. Ventilation and exhaust systems5. Automatic temperature controls integrated with the MEP Systems6. Coordination and functionality with the Building Management Controls System7. Domestic Hot Water Heaters and distribution.8. Switchgear9. Electrical distribution10. Lighting*You may chose to not put all these systems in the scope of work. You can tailor this process to the results you want.

  6. Your RCx Scope of Work (SOW)? Be specific about your deliverables.Be specific about what you already know – SOPs, current drawings, etc.Make sure their submission matches your SOW and expectations.Beware of the additionalcosts- are you expecting your consultant to make re-design recommendations, provide energy models?If you are not specific in your SOW of work you are likely to get a proposal based on the standard commissioning process, which probably won’t give you the results you want.

  7. Energy Audits Level I – one day walk through, quick review of energy bills, find low hanging fruit.Level II – walk through and system performance testing, also takes into account the people factor and maintenance procedures. Results in a list of ECMs for the owner and identifies capital projects that require a Level III audit.Level III – looks in detail, including possible risks, at any capital project being considered for energy efficiency or conservation reasons. Results in an intensive engineering and economic analysis of the project/.

  8. Audit or Retro-comminsioning? Things to consider: - cost - complexity of the building - desired outcomes: low hanging fruit versus more complex solutions.If you want to bring the whole building back into operating specs and identify all building systems issues, including total range of ECMS, go for the RCx.If you want to quickly identify easily implemented ECMs only or want to assess a proposed capital project, go for the appropriate level of audit.

  9. Getting the results you want?PrepareResearchQuestionReact

  10. Questions and Discussion!

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