Retrocommissioning: Retail / Commercial / Industrial

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


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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

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Operates independently of energy suppliers and product manufacturers


Introduction

Three Building Types

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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


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

https://www.comed.com/Pages/home.aspx


Smart Ideas Retro-Commissioning Overview

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Emphasizes low-cost energy efficiency improvements to HVAC and lighting controls with simple payback of 1.5 years or less.

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Electricity Only.

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The Smart Ideas program funds 100% of the retro-commissioning service provider’s fees.

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The building owner is responsible for the total cost of improvements and must commit to a minimum spend (dependent on building size).


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.


Planning Phase

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Determine scope

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Outline systems

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Prepare list of measures

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Conduct detailed calculations

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Estimate costs

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Assemble total projected budget


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


Verification Phase

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Retro-commissioning service provider is responsible for confirming that measures are properly implemented and savings are achieved

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Inspect building visually

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Conduct functional testing

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Complete final trending


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


Retail Project Cost Analysis

Service Provider Cost $40,000


Payback (years) 1.4


* These do not include costs associated with program overhead.

Adjusted Costs with Service Provider Fee*


Retail Project Measures


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


Retail Project Measures


Retail Project Target

Electric Reduction (kWh)

Planning Phase Target -436,638

Selected Measures Target -416,640

Verified Measures -392,976


Retail Project Lessons

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From selected to verified…○6% of savings were not realized

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Primary reason○Operational conflicts

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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.


Commercial Project Overview

Project: Office HeadquartersSize: 650,000 square feetDuration: June 2009 –

May 2010






Verified Savings


Commercial Project Cost Analysis



Payback (years) 1.1



Adjusted Costs with Service Provider Fee *


Commercial Project Measures

* Included CO2

control; outside air damper and actuator repair

*

All are BAS-related


Commercial Project MeasuresRCM No. Measure Description


(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


Commercial Project Target






Commercial Project Lessons

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Primary reason○ Incomplete implementation of damper and

actuator replacement

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Measure persistence○Calibrate devices, sensors, and actuators

annually○Monitor data and set alarms to raise

awareness of energy savings


Industrial Project Overview

Project: Injection Molding Plant and ShowroomSize: 250,000 square feetDuration: June 2009 –

May 2010






Verified Savings


Industrial Project Cost Analysis



Payback (years) 1.9



Adjusted Costs with Service Provider Fee *


Industrial Project Measures

Most are BAS-related


Industrial Project Measures

RCM No. Measure Description


(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


Industrial Project Target






Industrial Project Lessons

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Primary reason○Adverse impact on industrial processes; measures

were not completely abandoned, however, and adjustments are being considered

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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


Monitor Implementation

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Hold weekly calls with key personnel featuring updates regarding progress

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Solicit feedback about potential savings falloff

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Identify solutions for any new concerns

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Communicate with all stakeholders regarding measure status

Track measures during the implementation phase to reduce savings fall-off.


Monitoring-Based Commissioning

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Monitoring-based commissioning can help achieve measure persistence

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Requirement is that the building needs a robust BAS with these characteristics

○

Web-based platform

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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.


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

Documents

Retrocommissioning: Retail / Commercial / Industrial