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A CASE STUDY in actual energy conservation Presented By Energy-Environment-Economics LLC E3.

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Presentation on theme: "A CASE STUDY in actual energy conservation Presented By Energy-Environment-Economics LLC E3."— Presentation transcript:

1 A CASE STUDY in actual energy conservation Presented By Energy-Environment-Economics LLC E3

2 What is a Kilo-Watt (kW)? A Kilo-Watt Hour? §What is it? A Kilo-Watt-Hour? §2500 square foot house uses approximately 10 kW §What is it worth? l.10$/kWh? l 10-15$ per kW? §If energy costs remained constant over the years, nobody would be at this presentation and all of these system types would still be in vogue l Double duct systems l Multi-zone air handling units l Constant flow air and water systems l No energy management capabilities

3 Commissioning Design Phase Construction Phase Acceptance Phase

4 Commissioning Defined???? §????????? §No Industry Standards §To some it is a glorified Test and Balance job §To some it is a point to point verification §To others it is a installed per the CDs process

5 What Commissioning is NOT §Systems Optimization §Problem solving §Operation and Maintenance cost control §The biggest bang for your energy buck, environment buck, or economic buck (E3 that is) §The final destination on your HVAC Systems Energy Conservation journey

6 What is Optimissioning SM ?? §Combination of Commissioning and Systems Optimization §Identifies pre-existing system deficiencies and develops protocols for remediation §Saves energy by fixing your problems, then and only then can the system be optimized for further energy savings

7 WAATS CMSB - How did it all start? §Inability to use the p/f heat exchanger §Excessive utility costs §Data Rooms temperature and humidity control problems §Bentley Engineering report concluded l Save $$ by adding more capacity???? l Already had 3 times the actual required capacity

8 Facility Description §Built in 1992 §Houses 2 simulator bays with 2 helicopter simulators each; supporting Data Rooms with Liebert CRAC units §2nd floor office/training/conference areas §3 chillers/towers/pumps §Hot/chilled water air handling units §Variable air and water flows §BacNet DDC system

9 Pre and Post Optimissioning SM Energy Consumption §The following slides graphically illustrate energy consumption of the facility. We believe no explanation is necessary, except to say that the results – nearly a 50% reduction in KW and KwH consumption – are nothing short of spectacular considering that only the HVAC component of the facilitys energy consumption was addressed

10 CMSB Energy Usage




14 Cooling Degree Days

15 Chilled Water System before


17 Chilled water system current status §One chiller system now satisfies the building, saving approximately 250 kW §Turned off 6 Liebert CRACs, even during plate/frame operation, saving another 30 kW §Plate/frame used 4-5 months/year §DDC system in complete automatic, all setpoints optimized §Expected to save approximately 1,200,000 kWh this year

18 What does it take? §Leadership §Vision §Talent §Experience §Thinking outside the box §COMMITTMENT

19 Other benefits??? §Besides reduced energy costs l Extended system life expectancy - all 3 chillers at CMSB with 30,000+ hours each, only one was ever required l Improved space conditions l Reduced O&M costs l More $$ for energy projects, including renewable energy projects

20 Commissioning §First step §Identifies existing O & M deficiencies §Necessary to develop Optimissioning SM plan §5-10% savings from straight commissioning l latest from CCC million s.f., saves 62K$ §Minimum of 30% from Optimissioning SM

21 Retro-Commissioning §A process to commission existing buildings l Will identify problems l Will result in $$ savings §Is NOT Systems Optimization §Will identify functional issues, will not develop the engineering required to provide solutions §Will evaluate EMCS (if existing) point-to point communication, will not evaluate performance of controls sequences

22 Optimissioning SM §A combination of commissioning and systems optimization §Savings 3-5 times traditional commissioning §Specialized skill set required l systems acumen l troubleshooting skills l controls expertise l engineering talent

23 Typical Characteristics of Troubled Systems §Inability to maintain design supply chilled water temperature during any occupied hour of the year §Constant hot/cold complaints §Out of capacity without adding square feet? §LARGE power bills? §Excessive maintenance costs

24 Low system DTs are a capacity and energy conservation cancer §Delta T is the difference between entering and leaving chilled water §Low (less than design) results in loss of capacity, temperature and humidity control problems §Reasons vary, but typically is a misunderstood phenomenon §Default response is to almost always add more capacity – is unnecessary and expensive

25 Thanks again for your time!! Energy-Environment-Economics.LLC

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