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Michael KukDirector of Technical ServicesSieben
Energy Associates, LLC
Retro-Commissioning:Retail / Commercial / Industrial
© Sieben Energy Associates, LLC 2
Learning Objectives
1. Follow Three Building Types Through the RCx Process
2. Identify Costs3. Identify Lessons Learned to
Improve the Process
AIA Quality Assurance
© Sieben Energy Associates, LLC 3
Visit SiebenEnergy.com for insights, news, and more
Energy Efficiency
Green Buildings
Strategic Consulting
Energy Purchasing
Commissioning
Management Services
Core Service Lines
Experience, Results & Relationships since 1990
About Sieben Energy Associates
•
Sieben
Energy Associates (SEA) is a strategic and technical energy and sustainability consulting firm
•
Provides services within the Chicago area and across the nation
•
Partners with clients in the commercial, industrial, institutional, and government sectors
•
Operates independently of energy suppliers and product manufacturers
© Sieben Energy Associates, LLC 4
Introduction
Three Building Types
•
Retail: Big Box Store
•
Commercial: Office Headquarters
•
Industrial: Injection Molding & Showroom
This presentation introduces three retro-commissioning projects, each involving a different building type.
All were completed as part of ComEd’s
state-mandated, utility-sponsored program on energy efficiency.
450,000 sq ft
650,000 sq ft
250,000 sq ft
© Sieben Energy Associates, LLC 5
Utility-Sponsored Retro-Commissioning
https://www.comed.com/sites/BusinessSavings/Pages/programsincentives.aspx
ComEd launches Smart Ideas for your Business, a ratepayer-funded program to help underwrite energy efficiency for large and small companies Programs: Prescriptive •
Custom •
New Construction
2008(PY 1)
2009(PY 2)
2010(PY 3)
ComEd adds retro-commissioning to its suite of Smart Ideas programsNew Program: Retro-Commissioning
ComEd expands the retro-commissioning program
© Sieben Energy Associates, LLC 6
Smart Ideas Retro-Commissioning Overview
•
Emphasizes low-cost energy efficiency improvements to HVAC and lighting controls with simple payback of 1.5 years or less.
•
Electricity Only.
•
The Smart Ideas program funds 100% of the retro-commissioning service provider’s fees.
•
The building owner is responsible for the total cost of improvements and must commit to a minimum spend (dependent on building size).
© Sieben Energy Associates, LLC 7
Phases of the Smart Ideas Program
ComEd evaluates each customer application for program suitability
Service provider performs site assessment and proposes initial list of low-cost measures
Service provider analyzes systems and measures, develops scope of work, and helps implement applicable measures Program administrator
verifies installationand submits summary report to ComEd
Customer applications that are not accepted are directed to other programs
5-6 weeks*
6-10 weeks*
4 weeks*
Application
Planning
Investigation & Implementation
Verification
Other ComEd
Programs
* The duration of each phase can vary from project to project. Lengths indicated are approximate.
© Sieben Energy Associates, LLC 8
Planning Phase
•
Determine scope
•
Outline systems
•
Prepare list of measures
•
Conduct detailed calculations
•
Estimate costs
•
Assemble total projected budget
© Sieben Energy Associates, LLC 9
Investigation & Implementation Phase
Investigation of Measures•Log and trend data•Perform focused assessment of systems; test sequences•Produce diagnostic and calculation plans•Refine calculations•Obtain contractor pricing
Implementation of Measures•Building owner is responsible for costs, project management, and installation of measures•Retro-commissioning service provider offers technical assistance and installation guidance
© Sieben Energy Associates, LLC 10
Verification Phase
•
Retro-commissioning service provider is responsible for confirming that measures are properly implemented and savings are achieved
•
Inspect building visually
•
Conduct functional testing
•
Complete final trending
© Sieben Energy Associates, LLC 11
Retail Project Overview
Project: Big Box StoreSize: 450,000 square feetDuration: June 2009 –
May 2010
Energy Saved (kWh) 392,976
Dollars Saved $38,713
Implementation Cost $14,265
Customer Payback (years) 0.37
Cost per kWh saved $0.0363
Verified Savings
© Sieben Energy Associates, LLC 12
Retail Project Cost Analysis
Service Provider Cost $40,000
Implementation Cost $14,265
Payback (years) 1.4
Cost per kWh saved $0.14
* These do not include costs associated with program overhead.
Adjusted Costs with Service Provider Fee*
© Sieben Energy Associates, LLC 14
Retail Project MeasuresRCM No. Measure Description
Annual Electric Energy Savings
(kWh/yr)
Average Peak Electric Demand
Savings (kW/mo)
Annual Electric Energy Cost Savings
($/yr)
Implementation Cost ($)
Simple Payback
(years)
4.1.1
Turn Off Primary And Secondary HW/CHW Distribution System During “Shoulder Periods”
101,000 21.2 $9,540 $2,500 0.26
4.1.2Implement Active Demand Control Of The Chillers 55,000 67.0 $8,956 $2,500 0.28
4.1.3Implement Chilled Water Temperature Reset 31,276 8.5 $3,085 $2,500 0.81
4.1.4Implement Automatic Pump Pressure Reset Control 47,000 8.1 $4,315 $2,500 0.58
4.1.5
Do Not Operate The Standby Primary Chilled Water Pump While In Ice Making Mode.
12,300 4.6 $1,295 $2,500 1.93
4.1.6Turn Off the Air-Handling Units during Unoccupied Periods 10,905 0 $872 $1,000 1.15
4.1.7Turn off the Cleaning Lights during Store Non-operation hours 76,287 0 $6,100 $2,400 0.39
4.1.8
Use Portable Lighting Fixtures for Localized Maintenance Operations During Store Non-business Hours
7,107 0 $568 $600 1.06
4.1.9
Turn Off Lighting in the Entrance Areas and Outside Canopy during Unoccupied Hours
47,120 0 $3,768 $1,608 0.43
4.1.10Turn Off Loading Dock Lighting during Store Unoccupied Hours
25,229 0 $2,017 $135 0.07
4.1.11
Turn Off the Battery Charging Area Exhaust Fan when the Batteries are not being Charged
4,088 0 $327 $350 1.07
4.1.12Turn Off Parking Lot Lighting during Unoccupied Hours 10,511 0 $840 $135 0.16
4.1.13Turn Off Air-compressor during Unoccupied Hours 4,435 0 $355 $350 0.99
7% PLANNING 432,257 109.4 $42,038 $19,078 0.456.5% VERIFIED 398,779 $39,175 $14,265 .36
© Sieben Energy Associates, LLC 16
Retail Project Target
Electric Reduction (kWh)
Planning Phase Target -436,638
Selected Measures Target -416,640
Verified Measures -392,976
© Sieben Energy Associates, LLC 17
Retail Project Lessons
•
From selected to verified…○6% of savings were not realized
•
Primary reason○Operational conflicts
•
Measure persistence○Limit opportunities to alter the measure (e.g., limit
access to the BAS) to prevent operators from changing setpoints and schedules.
○Request support from higher management.○Educating staff with respect to how the measures
save money and energy promotes buy-in.
© Sieben Energy Associates, LLC 18
Commercial Project Overview
Project: Office HeadquartersSize: 650,000 square feetDuration: June 2009 –
May 2010
Energy Saved (kWh) 479,654
Dollars Saved $50,757
Implementation Cost $17,544
Customer Payback (years) 0.34
Cost per kWh saved $0.0366
Verified Savings
© Sieben Energy Associates, LLC 19
Commercial Project Cost Analysis
Service Provider Cost $40,000
Implementation Cost $17,544
Payback (years) 1.1
Cost per kWh saved $0.12
* These do not include costs associated with program overhead.
Adjusted Costs with Service Provider Fee *
© Sieben Energy Associates, LLC 20
Commercial Project Measures
* Included CO2
control; outside air damper and actuator repair
*
All are BAS-related
© Sieben Energy Associates, LLC 21
Commercial Project MeasuresRCM No. Measure Description
Annual Electric Energy Savings
(kWh/yr)
Peak Electric Demand Savings
(kW/mo)
Annual Electric Energy Cost Savings ($/yr) Implementation
Cost ($)
Simple Payback (years)
1 Adjust and calibrate the positions of the outside air dampers 124,346 71 $14,932 $2,300 0.2
2 Optimize or create sequence of operation for CO2 control of AHUs 221,626 126 $26,566 $12,700 0.5
3 Adjust (lower) speeds on constant speed fans. 174,447 50 $16,106 $7,700 0.5
4 Control supply and exhaust fans for building garage with CO sensor 9,725 2 $724 $3,400 4.7
5 Turn off snow melt boiler according to calendar 77,493 0 $4,262 $400 4.7
6 Optimize operation of snow melt boiler in winter months 124,293 0 $6,836 $3,200 0.5
7 Identify & use standard space temperatures for spaces that house art and artifacts. 53,240 0 $2,928 $1,000 0.3
8 Disable bridge heating during cooling season 6,502 11 $464 $400 0.9
9 Turn off 1/2 of parking garage lights in sections leading to below grade parking 3,872 1 $316 $800 2.5
10 Turn off lights in the maintenance building based on photosensor 3,911 0 $215 $400 1.9
4% PLANNING REPORT 799,455 261 $72,548 $32,300 0.42.4% VERIFIED 479,654 $50,757 $17,544 .42
© Sieben Energy Associates, LLC 22
Commercial Project Target
Electric Reduction (kWh)
Planning Phase Target -799,455
Selected Measures Target -579,685
Verified Measures -479,654
© Sieben Energy Associates, LLC 23
Commercial Project Lessons
•
From selected to verified…○17% of savings were not realized
•
Primary reason○ Incomplete implementation of damper and
actuator replacement
•
Measure persistence○Calibrate devices, sensors, and actuators
annually○Monitor data and set alarms to raise
awareness of energy savings
© Sieben Energy Associates, LLC 24
Industrial Project Overview
Project: Injection Molding Plant and ShowroomSize: 250,000 square feetDuration: June 2009 –
May 2010
Energy Saved (kWh) 340,854
Dollars Saved $26,726
Implementation Cost $11,041
Customer Payback (years) 0.41
Cost per kWh saved $0.0324
Verified Savings
© Sieben Energy Associates, LLC 25
Industrial Project Cost Analysis
Service Provider Cost $40,000
Implementation Cost $11,041
Payback (years) 1.9
Cost per kWh saved $0.15
* These do not include costs associated with program overhead.
Adjusted Costs with Service Provider Fee *
© Sieben Energy Associates, LLC 27
Industrial Project Measures
RCM No. Measure Description
Annual Electric Energy Savings
(kWh/yr)
Peak Electric Demand Savings
(kW/mo)
Annual Electric Energy Cost Savings
($/yr)
Implementation Cost ($)
Simple Payback(years)
1Reduce air-pressure setting on the air-compressor system
20,657 3.1 $1,746 $135 0.08
2Use colder outside air for the air-compressor intake
35,568 8.3 $3,206 $500 0.16
3 Reduce the lighting usage in the cafeteria during periods of low occupancy
6,575 0 $487 $350 0.72
4 Lower the operating set-point on the RTUs for economizer operation
131,162 0 $9,721 $203 0.02
5 Adjust the cooling set-point on the RTUs by re-calibrating the temperature sensors in the conditioned spaces
158,375 0 $11,738 $1,600 0.14
6 Ensure that the door separating the plant hallway and the air- compressor room is closed
36,498 8.1 $3,262 $235 0.07
7 Set-forward the night cooling set-point temperature on the Liebert unit serving the showroom in EBC building
50,053 0 $3,710 $336 0.09
8 Modify Building Automation System (BAS) Demand Control Ventilation programming
51,492 10.0 $4,501 $1,600 0.36
9 Modify Building Automation System (BAS) programming for available economizer outside air
35,717 24.7 $4,345 $1,600 0.54
6.7% PLANNING 526,097 54.4 $42,717 $6,558 0.15
4.3% VERIFIED 340,854 $26,726 $11,041 41
© Sieben Energy Associates, LLC 28
Industrial Project Target
Electric Reduction (kWh)
Planning Phase Target -526,097
Selected Measures Target -480,939
Verified Measures -340,854
© Sieben Energy Associates, LLC 29
Industrial Project Lessons
•
From selected to verified…○29% of savings were not realized
•
Primary reason○Adverse impact on industrial processes; measures
were not completely abandoned, however, and adjustments are being considered
•
Measure persistence○Calibrate devices, sensors, and actuators annually○Monitor setpoints with respect to process controls
by feedback from plant manager○Limit access to compressor controls
© Sieben Energy Associates, LLC 30
Monitor Implementation
•
Hold weekly calls with key personnel featuring updates regarding progress
•
Solicit feedback about potential savings falloff
•
Identify solutions for any new concerns
•
Communicate with all stakeholders regarding measure status
Track measures during the implementation phase to reduce savings fall-off.
© Sieben Energy Associates, LLC 31
Monitoring-Based Commissioning
•
Monitoring-based commissioning can help achieve measure persistence
•
Requirement is that the building needs a robust BAS with these characteristics
○
Web-based platform
○
Simple and straightforward data collection
○
Assurance that the BAS is monitoring enough points throughout the building
Retro-commissioning can serve as an excellent precursor to monitoring-based commissioning.
© Sieben Energy Associates, LLC 32
AIA Quality Assurance
Portland Energy Conservation, Inc is a registered provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-AIA members are available on request.
This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
Michael KukDirector of Commissioning ServicesSieben Energy Associates, [email protected]
333 N. Michigan Avenue, Chicago, Illinois(312) 899-1000 SiebenEnergy.com