Retro-commissioning

Program Overview

Energy Efficiency Portfolio

Business Case for Energy Efficiency

RCx Program Overview

Measurement & Verification

Questions

Agenda

ComEd Smart Ideas for Your Business

Energy Efficiency Portfolio

1. Prescriptive Program

2. Custom Program

3. New Construction Program

4. Technical Assistance Service

5. ComEd RCx program – service is the incentive

6. Compressed Air Program

7. Residential Program

8. Load Response Program

9. Others Measures implemented in RCx do not qualify for or overlap with additional

incentives through other ComEd programs

A Business Case for Energy Efficiency:

The Triple Bottom Line

People (human capital):

• Industry leadership among peers

• Employee satisfaction

• Attract forward thinking tenants/customers

• Competitive edge among similar facilities

Planet (natural capital):

• Reducing CO2 emissions produced by electricity & gas reduces

the greenhouse effect

Profit (economic value):

• Real estate benefit, higher building value, tenant rates

• Lower operational costs, extends equipment life

• Reduced electric & gas bill

A business case for energy efficiency

• 8-9% operating costs*

• 7.5% building value increases*

• 6.6% return on investment improves*

• 3.5% occupancy ratio increases*

• 3% rent ratio increases**

Perceived Business Benefits to Green

5

Source:

*McGraw-Hill Construction, Key Trends in the European and U.S. Construction Marketplace

SmartMarket Report, 2008

**McGraw-Hill Construction, Greening of Corporate America SmartMarket Report, 2007

6

Source: E SOURCE; data from Lawrence Berkeley National Laboratory,

Portland Energy Conservation Inc., and Energy Systems Laboratory, Texas

A&M University

For projects where deficiencies were characterized, 63 percent of problems were related to the overall HVAC system in some fashion.

EMS3.1%

Envelope0.1%

Plug loads0.1%

Air Handling37.1%

Other30.1%

Cooling plant 11%

Heating plant6.3%

Terminal units4.4%

HVAC4.2%

Lighting3.6% 0%

Building system deficiencies

Retro-commissioning, what is it?

• Retro-commissioning (RCx)

– The process of bringing a building’s mechanical and electrical

systems, including building controls, to peak performance.

– Investigation of existing system performance, the adjustment of the

operating parameters and the repair of equipment.

• Goal: identify low-cost operational improvements that deliver high

energy savings

• Perform building tune-up and adjust existing systems, typically without

capital costs

• Collaboration between Building Operator & RCx Service Provider

7

Common Misunderstandings RCx:

• RCx is not an energy audit.

• RCx is not a facility evaluation.

• RCx is not a feasibility study.

• RCx is not a study to determine technical feasibility of capital-

investment type energy efficiency projects (co-generation unit)

8

Benefits to RCx, energy and non-energy

• Reduce building operating costs (energy, maintenance, premature

equipment replacement).

• Extend equipment service lifetime.

• Improve building performance and system integration.

• Increase asset value of the property.

• Reduce comfort complaints.

• Identify potential indoor environmental quality issues.

• Ensure building operations meet owner’s requirements.

• Can increase occupant productivity and safety.

• Provide building operator training.

9

Lawrence Berkeley National Laboratory study

• Median RCx costs (332 projects) were $0.30/ft2

• Median cost savings were $0.29/ft2 ­per year

• Median electrical demand savings from baseline consumption is 5%

• Median electrical annual energy savings from baseline is 9%

• Median total annual energy savings from baseline is 16%

The source of this information is Building Commissioning: A Golden Opportunity for

Reducing Energy Costs and Greenhouse Gas Emissions, Evan Mills, Ph.D., Lawrence

Berkeley National Laboratory, July 21, 2009, http://cx.lbl.gov/documents/2009-

assessment/LBNL-Cx-Cost-Benefit.pdf

10

Natural Gas

Joint Electric & Natural Gas Energy Efficiency program

• Nicor

• Peoples Gas

• North Shore Gas

Retro-commissioning:

• Electric and Natural Gas combined into program

• Pilot program last year

• Year 2 starting on June 1, 2011

RCx Program Overview

Program Overview

Application Phase: Screening, set goals

Planning Phase: Identify measures, operational adjustments

Investigation Phase: Baseline data

Implementation Phase: Customer installations

Verification Phase: Report final data to ComEd

Customer Commitments

Program Agreement signed after the RCx Plan is presented

Commit $10,000 minimum with Simple Payback < 1.5

Meet deadline specified in Program Agreement

Support the RSP team in their investigation

Select and manage the implementation team

Building Operator Certification, CC

Application Phase

Screening process for selecting successful projects

To help ensure program cost-effectiveness, an energy savings

target is set, average PY3 is 600,000 kWh / year

Planning Phase

Evaluate function, sequencing and scheduling of major systems

Interview with facility operation staff

Set up Building Automation System (BAS) trends

Spot check equipment on BAS

Plan critical items for investigation and verification phases

Identify sufficient measures to achieve target

Planning Phase milestone decision:

1. Proceed to Implementation Phase

2. Modify RCx scope if energy savings too low

3. End RCx project at Planning Phase

Click on a specific

day to narrow down

your costs.

View daily, weekly,

or monthly usage

trends

Planning Phase deliverables

Retro-commissioning Plan

Preliminary D&C Plans

Customer Selection Form

Building Equipment List*

Site Assessment Form*

*Alternative forms OK with pre-approval

Customer Selection Form

Investigation Phase

Detailed investigations by RSP Functional testing

Collect trend logs or data logs

Revise energy saving estimates

Define scope of work for candidate measures

Bi-Weekly Meetings

Diagnostic & Calculation Plans present findings

Investigation Phase deliverables

Investigation Report

D&C Plans

Customer Selection Form

Standard RCx Procedure Forms

Building Equipment List

Implementation Phase

Bi-Weekly Meetings

Customer responsible to implement measures Deadline set at 120 days from Program Agreement , or April 1

RSP provides technical support to implementation team

Verification Phase

Inspect RCMs for installed equipment and controls modifications

Execute measurement & verification (M&V) Plan from Diagnostic

and Calculation Plan

Set up trends depending on measure (one to four weeks)

Conduct functional test depending on measure

Perform spot measurements

Revise calculations as necessary

Verification Phase deliverables

Customer Selection Form for completion of RCMs

Verification Report

D&C Plans

Common RCx Measures

• Fixing ventilation dampers that are open when they should be closed (or vice versa).

• Adjusting chiller operation to better match building load conditions.

• Aligning zone temperature set-points to match the building's actual occupancy

• Reducing ventilation in over-ventilated areas.

• Eliminating simultaneous heating and cooling.

• Reducing supply air static pressure set points.

• Focus on cost-effective operation and maintenance improvements (education to staff on continuous building performance, digital controls with schedules, etc.)

• Properly tune equipment for maximum efficiency.

• Sustainability in optimum performance schedules (eliminate manual controls where human interference is more accessible)

• Optimize building systems as a whole, functioning together

• Free energy – use outside air and lighting when available

• Demand savings – operate equipment as needed or when occupied

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Measurement & Verification

Overview

Calculation and M&V Guidelines

• Adherence eases QC process for RSP and Nexant

• Adherence improves evaluation results

Measure tiers

Measure Impacts

(kWh/yr)

Percent of Total Site

RCx Savings

Measure Category

>75,000 Any Tier 1 (Large)

75,000 > 25% Tier 1 (Large)

75,000 25% Tier 2 (Small)

Measures tiers are defined at a strategy level

Why measure tiers?

• Focus RSP efforts on larger impacts!

• PY2 Results:

– 125 Measures in commercial buildings

– Small Measures (<75,000 kWh)

• Were only 26% of total impacts

• But covered 78% of the # measures we looked at

• Ways to decrease efforts on small measures:

– Provide calculators

– Reduce M&V requirements for small measures

Tier 1 requirements

• Savings calculations based on engineering principles

– “Rules of Thumb” not acceptable

• MS Excel based custom calculations

– Whole-building models not acceptable

– Modeling of buildings/systems with packaged software only with prior

approval

• International Performance Measurement and Verification Protocol

(IPMVP) Option A or B

– Based on field-measured data of both pre-install and post-install

– 2-3 weeks of trending on important parameters

– Spot measurements supporting trend data

Tier 2 requirements

• Savings calculations based on engineering principles

– “Rules of Thumb” not acceptable

• MS Excel based calculations

– Program provided calculators for 10 common measures

– Custom calculators developed by RSP for other measures

– Custom calculators developed by RSP where template calculator not fitting

• M&V for critical items

– Screen shots of pre- and post- install setpoints

– Spot measurements for select data

– Trending where critical

Tier 2 calculators

• Template calculators

– Adjust economizer setpoints

– Demand control ventilation

– Schedule single AHU

– Duct static pressure reset/reduce

– Schedule CHW or HW pumps

– Condenser water reset

– Chilled water reset

– Supply air temp reset

– Pump differential pressure reset/reduce

– Reduce minimum VAV box position

RCX Process Summary

Befo

re

RC

x

Submit

applicationScreening

Kick-off

Meeting

Site

Assessment

Interview

Operators Collect Data RCx Plan

Invest-

igations

Implement

Measures

Select

Contractors

Sign

AgreementD & CSign CSF

Thank you…

Questions?