EXISTING BUILDINGS

5 EXISTINGBUILDINGS

Slide header copyIn This Chapter

> Sustainable existing buildings> Planning green projects for

existing buildings> Measures to improve existing

buildings> Retrocommissioning and

ongoing commissioning

1-15-1

Slide header copyS

5-2

> According to Elefante, in a generation:20

Four out of five existing buildings will be renovated

But just two new buildings will be added to building stock

Slide header copyAssessing EB Project Goals

1-15-3

> Considerations: Client motive/priority The “going-in” state of the

building Cost threshold Challenges

Slide header copyAssessment Tools

5-4

> GBI’s CIEB Tool (pictured)

> ENERGY STAR Portfolio Manager

Slide header copySetting Performance Targets

> Realistic return on performance

> Realistic assessment of layout and design of building/leased spaces

> Set cost expectations> Comparable building

benchmarks

1-15-

Slide header copyMeasurement of Building Improvements

5-6

> Site energy use/Source energy use

> Carbon foot print > Water usage> Waste

Slide header copyCommon Mistakes for EB Upgrades

> Focus on sustainability goals, not certification goals

> Recognize danger of too many improvements made without overall planning

1-15-7

Slide header copyO&M Improvements

5-8

> Green cleaning> Green pest

management> Efficient lighting > Maintenance of HVAC

operations> Staff training

> Tenant education> Purchasing policies> Preventive

maintenance> Supporting commuting

alternatives> Optimizing water use

for landscaping

Slide header copyCapital Upgrades

1-15-9

> Considerations: Nature and length of building

operations disruptions Tenant support of upgrade Engineering limitations of building Expert consultation and

recommended options

Slide header copyCapital Upgrades for EB HVAC

5-10

> Fuel cell power generation> Chilled-water applied systems (chiller)> Off peak cooling and thermal storage

systems> Combined heat and power (CHP)

systems> Variable frequency drives (VFDs)

Slide header copyGetting the Word Out: Greenhouse Gas Savings

> EPA Greenhouse Gas Equivalencies Calculator

> www.epa.gov/solar/energy-resources/calculator.html

1-15-11

Slide header copyCommissioning for EB

5-12

Slide header copy

> Identifies and addresses system inefficiencies

> Improves building’s overall performance

> Helps drive operating expenses ↓, NOI ↑

> Identifies IEQ issues

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> Ensures owner expectations for operations

> Provides additional benefits

> Building staff well-trained

Retrocommissioning Benefits

Slide header copyRetrocommissioning Payback (Median)

5-14

Slide header copyRetrocommissioning as First Step

1-15-15

Slide header copyCommissioning Challenges

5-16

> Rent structure disincentive for some owners

> Potential impact to tenant improvements already in place

> Disruption of building operations potentially impacts tenant’s business operations

Slide header copyCase Study: Existing Building O&M

> California EPA headquarters in Sacramento

> Has become example of how small changes in building practices can significantly increase its sustainability and reduce operating expenses

1-15-17

Slide header copyExercise: Sustainable Existing Building Concepts

5-18

Variable frequency drives (VFDs)Ongoing commissioningThermal storage systemCFLsAPPA custodial effectiveness auditHow maintenance may pay off in greater energy efficiencyGeothermal heat generationIntegrated upgrade approach

E.

B.

A.

G.

F.

H.

D.

C.