Commissioning and Energy Savings

Presented By:

H. Kelly TisdaleEnergy Services General Manager

The Brewer-Garrett Company

OPFMA October 24th, 2011

AGENDARecent ProjectsWhy do we need commissioning / retro-

commissioningWho does this work?Keys to CommissioningBenefits of CommissioningTypes of CommissioningCommissioning and Energy SavingsSummary

Recent Commissioning Projects

Bridgestone Tech Center: Commissioning for LEED Certification.Size: 260,000 s.f. Cost: $100,000,000

Central chilled water plant upgrades, demand control ventilation and Building Automation system expansion and optimization; lighting retrofits, mechanical system upgrades, LED and solar power lighting, vending machine control,

utility metering, recycling and water conservation.Size: 3,132,544 s.f. Cost: $51,119,590

HVAC and mechanical systems upgrades, Building Automation system, Sequence of Operations.Size: 1,400,000 s.f. Cost: $28,000,000

Building Automation System, HVAC and mechanical system upgrades, and Sequence of Operations.Size: 810,000 s.f. Cost: $16,000,000

Cleveland Museum of Contemporary Art: Commissioning for LEED Certification. Size: 40,000 s.f. Cost: $ 17,000,000

The Brewer-Garrett Company

Why do we need Commissioning?

Design and Construction industries pressed to produce cheaper / faster

80% of new building problems are HVAC related

15% is building envelope60% to 70% of building energy is HVACOwners’ new buildings not meeting

expectations

Who does this work?

CM’s or GC’sEngineers/ArchitectsEquipment RepsOwnersContractors / TABBrewer-Garrett (Third Party) <- Best

Choice

Keys to Commissioning To Observe and Document Providers work for Owners Act as owner’s “resident expert” Improve the communication between Team

Members Owner- Retro Cx Architect / Engineer – Retro Cx CM Contractors Maintenance – Retro Cx

Types of Commissioning Commissioning

Full Blown OSFC Partial (A La Carte) LEED-NC (New Construction) Standard / Enhanced New Construction, no previous Cx done

Retro-Commissioning LEED-EB (Existing Buildings) Building built, no previous Cx done

Re-Commissioning (“One-Time Check-Up”) Cx previously done and now performed one time

Continuous Commissioning (“Annual Check-Up”) Cx previously done and periodically re-done

Benefits of commissioning It’s Required!

LEED prerequisite OSFC requirement

Establishes a energy BASELINE Potential savings for developers during

building resale or future construction projects “It pays for itself!”

Phases of CxConceptual PhaseDesign PhaseConstruction PhaseOccupancy Phase – Retro CxWarranty Phase – Retro Cx

Time

Opportunity to reduce life cycle cost by 10 - 20%100%

Design ConstructConcept Occupancy & Operations

20-25% of the cost of ownership is construction, 75-80% is operations and maintenance . . .

Design Reviews

Functional Testing

11-mo Walk-through

The Brewer-Garrett Approach

The Brewer-Garrett Approach

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Energy OpportunitiesOutdoor Air / VentilationFan PowerTime of Day / SchedulingBuilding EnvelopeHot Deck / Cold Deck

Outdoor Air / VentilationProblems

Disconnected, broken or deprogrammed operators

Are sensors in place, CO2, occupancy….are they calibrated

Do dampers close off Leakage on old dampers?

A 100,000 sq ft building may waste $30,000 annually due to processing to much or unneeded outdoor air

Fan PowerAre VFDs Locked outAre Supply and Return Air Dampers

synced100,000 sq ft may have 100hp Is duct pressure controlled correctlyReducing run times 50% can save $23K

Exhaust FansMany run 24 hours a

dayShould be tied into

timers or occupancy sensors

Often a victim of “value engineering”

Exhaust air is 100% Outdoor Air

Annual Savings = $10,000

Hardwired Exhaust

Fan

Scheduling – Temp. Set BackOriginal Schedule rarely followedExceptions (overrides) become the ruleCleaning schedules often treated as

occupiedLighting schedules…active ambient

sensorAggressive and realistic setback

schedule will save 3% on utility bills or approximately $10,000 in our example

Building Envelope15% of Original Commissioning issuesCaulkingTuck PointingExpansion JointsWindows / DoorsAir entering building through cracks

cannot be controlledMoisture in building…mold, energy waste3% to 10% in savings – $9,000 annually

Control StrategiesHot Deck/Cold DeckReset Deck TemperaturesEconomizersAir Balance = pressure at doorwaysSavings of approximately 5%$15,000 annually

Building Totals100,000 Sq. Ft. building$300,000 annual utility bill – gas/electricSavings

Outdoor Air - $30,000 Fan HP - $23,000 Exhaust Air - $10,000 Scheduling $10,000 Building envelope $ 9,000 Control Strategies $15,000Total $97,000

Commissioning SummaryCost for 100,000 sq ft buildingTypically $.50 to $1.50 per sq. ft.Commissioning Cost = $100,000Cost of repairs (envelope, controls, etc.

= $100,000) Total cost = $200,000Savings = $97,000Simple Payback = 2+ years

Take-AwaysCx saves money for new and existing

buildings (Labor, Materials, and Energy)Cx changes to match owner’s needsCx smoothes out construction process

and benefits everyoneCx satisfies the customers by giving

them the building they envisioned in the first place