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A CASE STUDY in
actual
energy conservation
Presented By Energy-Environment-EconomicsLLC
E3
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?
.10$/kWh? 10-15$ 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
Double duct systems Multi-zone air handling units Constant flow air and water systems No energy management capabilities
Commissioning
Design Phase
Construction Phase
Acceptance Phase
Commissioning Defined????
?????????No Industry StandardsTo some it is a glorified Test and Balance
jobTo some it is a point to point verificationTo others it is a “installed per the CD’s”
process
What Commissioning is NOT
Systems OptimizationProblem solvingOperation and Maintenance cost controlThe biggest bang for your energy buck,
environment buck, or economic buck (E3 that is)
The final destination on your HVAC Systems Energy Conservation journey
What is OptimissioningSM??
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
WAATS CMSB - How did it all start?
Inability to use the p/f heat exchangerExcessive utility costsData Rooms temperature and humidity
control problemsBentley Engineering report concluded
Save $$ by adding more capacity???? Already had 3 times the actual required
capacity
Facility Description
Built in 1992Houses 2 simulator bays with 2 helicopter
simulators each; supporting Data Rooms with Liebert CRAC units
2nd floor office/training/conference areas3 chillers/towers/pumpsHot/chilled water air handling unitsVariable air and water flows BacNet DDC system
Pre and Post OptimissioningSM 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 facility’s energy consumption was addressed
CMSB Energy Usage 2003-2005
CMSB Energy Usage 2003-2005
0
100
200
300
400
500
600
700
June - May
KW
KW Demand June 01- May 02
KW Demand June 02 - May 03
KW Demand June 03 - May 04
KW Demand June 04 - May 05
CMSB Energy Usage 2003-2005
KwH Consumption June 2001- May 2005
0
50000
100000
150000
200000
250000
300000
350000
June - May
Kw
H
Kw H June 01 - May 02
Kw H June 02 - May 03
Kw H June 03 - May 04
June 04 - May 05
CMSB Energy Usage 2003-2005
Annual kWH Totals
0
600000
1200000
1800000
2400000
3000000
02 Annual Total 03 Annual Total 04 Annual Total 05 YTD Total
kWH Annual kWH T otals
Cooling Degree Days
Cooling Degree Days 2001 - 2005
0
100
200
300
400
500
600
700
800
June - May
CDD June 01 - May 02
CDD June 02 - May 03
CDD June 03 - May 04
CDD June 04 - May 05
Chilled Water System before
Chilled Water System before
Chilled water system current status
One chiller system now satisfies the building, saving approximately 250 kW
Turned off 6 Liebert CRAC’s, even during plate/frame operation, saving another 30 kW
Plate/frame used 4-5 months/yearDDC system in complete automatic, all setpoints
optimized
Expected to save approximately 1,200,000 kWh this year
What does it take?
LeadershipVisionTalentExperienceThinking outside the boxCOMMITTMENT
Other benefits???
Besides reduced energy costs Extended system life expectancy - all 3
chillers at CMSB with 30,000+ hours each, only one was ever required
Improved space conditions Reduced O&M costs More $$ for energy projects, including
renewable energy projects
Commissioning
First stepIdentifies existing O & M deficienciesNecessary to develop OptimissioningSM plan 5-10% savings from straight commissioning
latest from CCC - 1.2 million s.f., saves 62K$
Minimum of 30% from OptimissioningSM
Retro-Commissioning
A process to commission existing buildings Will identify problems Will result in $$ savings
Is NOT Systems OptimizationWill identify functional issues, will not develop the
engineering required to provide solutionsWill evaluate EMCS (if existing) point-to point
communication, will not evaluate performance of controls sequences
OptimissioningSM
A combination of commissioning and systems optimization
Savings 3-5 times traditional commissioningSpecialized skill set required
systems acumen troubleshooting skills controls expertise engineering talent
Typical Characteristics of Troubled Systems
Inability to maintain design supply chilled water temperature during any occupied hour of the year
Constant hot/cold complaintsOut of capacity without adding square feet?LARGE power bills?Excessive maintenance costs
Low system DT’s 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
