Energy Audits: Lessons Learned Over 30 Million Square Feet

Transcription

1 Energy Audits: Lessons Learned Over 30 Million Square Feet Presented to: Environment, Energy Security & Sustainability By: Corry W Freeman, CEM AMEC Earth & Environmental, Inc. Midwest Plaza Building 800 Marquette Ave, Suite 1200 Minneapolis, MN Thursday, May 12 th,

2 Purpose AMEC has evaluated over 30M square feet of building area, to included military facilities and colleges The Lessons Learned shows how we ve made our process more efficient to identify cost effective opportunities to conserve energy 2

3 Introduction to the Lesson s AMEC has Learned from Energy Audits Goals Repeated Questions Challenges Before the Site Visit Site Visit Identifying Energy Conservation Opportunities Financial Modeling The Report 3

4 Define Energy Goals Clearly define goals Reduction in energy Use less water Use of renewable energy (waste, wind, biomass, solar) Green Buildings LEED Certification Energy Star Reduce fossil fuels Reduce energy costs Reduce first costs Reduce life cycle costs Create a baseline compare: SIR LCC And determine payback period 4

5 Goals Federal agencies already have a goal: Highlights of EO Reduce energy intensity by 30% from 2003 (baseline) to 2015 (Law with Energy Independence & Security Act 2007) Increase use of RE (more than EPAct 2005) Reduce water intensity (Gal per SF) 16% from 2007 to 2015 Requirements to verify and achieve EO DUERS EMS allow to select targets, operate, monitor, measure, and manage 5

6 Challenges and Questions to Achieve the EO Site or source energy? Electric is more efficient at the site Natural Gas is more efficient if comparing to the source of energy (electric generation and line loss) Fuel oil is also used for building energy Do you convert all these fuels to one unit? Or can you keep each fuel in their traditional units kwh Therm Intensity based on square feet Changes from year to year Weather Operation 6

7 Pre Site-Visit Information Request Utility Bills gas and electric consumption with total building square footage Copy summer and winter electric bills depicting tariff rates and demand charges Electric and gas lines on base, to include line sizes, substations, transformers Prior Energy Studies Floor plans (Fire Exit type) Energy management control system (software program) List of buildings with EMCS sequence of operations (summary) 7

8 Pre Site-Visit Information Request (cont) Equipment List of main lighting systems (street, building interior/exterior) List of major HVAC for each building and approximate age List of buildings with air compressors List of other major components 8

9 Typical Energy Use Breakout Example Office Building Energy Use Breakout (Electric and Gas) US DOE Data, % Cooling 9% Water Heating 5% Ventilation 16% Office Equipment 1% Cooking 25% Space Heating 29% Lighting 6% Other* * Other includes miscellaneous uses (5%) and Refrigeration (<1%) 9

10 The Main Purpose of Being Prepared Efficient on-site Whole site approach- what s there and what s required 10

11 Preparation Buildings to be audited Schedule Logistics on site Concentrate on: Water Energy Whole Building Specific Energy Hogs Renewable Energy Energy Security Site Infrastructure De-centralize Thermal storage CHP 11

12 During the Site Visit Site Access Escorts or keys to mechanical rooms Access to facility management staff Who uses this room Why do you need this pump Why do you need this water at 140 degrees What s the compressed air used for Access to data Information Flow Introductions Informing staff Informing facility managers Providing assistance Minimizing impact building operations Summary of findings and what to expect in the report 12

13 Operation and Maintenance Hiding in Plain Sight Low cost opportunities and simple problems noticed during walk through are discussed, then fixed by maintenance staff or occupants without full analysis. Doors, insulation, leaks, thermostats, lighting control, fans, etc. 13

14 Control 14

15 Know your buildings Where are the savings going to be? Envelope Dominated (also climate dominated ) Example: residential and smaller buildings Internal Load Dominated Example: large commercial buildings and offices Ventilation Dominated Example: laboratories, hospitals, paint booths, maintenance shops 15

16 Water Conservation Low-water toilets, urinals, faucets No obvious signs of waste/leaks Reduce irrigation use by using storm water as a resource and install lowwater use landscaping. Replace faucet fixtures Motion sensors Low-flow aerators 16

17 Renewable Energy Solutions Solar PV Roof Arrays/Tiles Solar Wall 17

18 Assumptions Potential projects need to be cost effective In addition to capital costs and calculated energy savings there are other variables involved: Operation and Maintenance Costs or Savings Fixed-staffing Variable-consumables Service Life Terminal Value Construction Time Capital Improvements For IPP or Third Party Financing: Tax Credits or Incentives Rebates Debt to Equity Financing 18

19 Report Details of each project First costs Annual energy savings Annual cost savings State Assumptions Prioritize projects IRR SIR Payback Period Discounted payback LCC 19

20 Conclusion Identifying the Problem Goals or Intent Challenges Questions Before the Site Visit Site Visit Energy Analysis Financial Analysis Report The purpose of energy audits are to identify cost effective solutions to save energy. Preparation before the site will save time and energy for AMEC as well as building owner s and managers. 20

21 Questions? Thank You! Shaping the Future 21