CERT UPDATE TO GUILFORD COUNTY

ENERGY AUDITS OF

•BELLE MEADE BUILDING•BB&T BUILDING•HIGH POINT COURTHOUSE & DETENTION CENTER•HIGH POINT PUBLIC HEALTH BUILDING

APRIL 7, 2009

WORK TO DATE

• GATHERED ENERGY USE DATA

• REVIEWED EXISTING BUILDING CONDITIONS

• IDENTIFIED AND ANALYZED SEVERAL ENERGY CONSERVATION MEASURES

NORTH ELEVATION

GREENSBORO MENTAL HEALTH GREENSBORO MENTAL HEALTH BUILDINGBUILDING

• Building location Greensboro

• Built year 1991

• Total Area 99,935 ft2

SOUTHEAST CORNER

• In terms of operations the building is divided into three section:

– Main building: 87,421ft2;

12hr/6 days/week

– Computer: 6030ft2; 24hr/7days/week

– North Wing : 6030ft2; 24hr/7days/week

• Each sector has its own AC which runs 24hr/7days/week

Energy Source

Amount Consumed (BTU)

Cost ($)

Electricity 9,966,588,480 149,443.98

Natural gas 1,882,800,000 25,887.94

Energy Cost Index =$1.75/ft2/year

Energy Use Index =118.57/kBTU/ft2/year

ANNUAL ENERGY CONSUMPTIONANNUAL ENERGY CONSUMPTION

20082008

RETROFIT SAVINGS OPTIONSRETROFIT SAVINGS OPTIONS

Fixture Type # of Fixtures # of Lamps/FixtureA 567 3-T12 40 wattB 161 2-T12 40 wattC 83 2-T12 40 watt

COMMON LIGHTING FIXTURESCOMMON LIGHTING FIXTURES

Current Practice: T12, 40 watt, magnetic ballast; 3 different fixtures: A, B, and C Recommended: T8 32 watts; Electronic ballast

OPTION 1:OPTION 1: REPLACE EXISTING LAMP REPLACE EXISTING LAMP

WITH ENERGY EFFICIENT LAMPWITH ENERGY EFFICIENT LAMP

Implementation CostFixture type A = $49.00/fixtureFixture types B & C =$32.00/fixtureTotal implementation cost = $35,737.00Simple payback period = 4.5 yearsDollar Savings from Lamp Type A, B, &

C =$7,867/yr

RETROFIT SAVINGS FROM HVACRETROFIT SAVINGS FROM HVAC

Option 2B: Changing from Fixed to Variable Frequency Drive

•Estimated Savings: $ 4,335/year

•Estimated Cost: $ 10,500•Simple payback period: 2.4 yearsThis analysis assumed that the City will

provide their own labor.

Option 2A: Turn of Main Building AC from 10:00pm to 6:00am Weekends & Holidays•Estimated Savings: $ 12,315/year•Estimated Cost: $ 0.00•Simple payback period: Immediate paybackThis analysis assumed that the City will provide their own labor.

Current practice: The fan is being driven by 75 hp motor, efficiency of 0.925 Recommended: Replace the 75 hp motor with efficient motor of efficiency 0.955 Assume an average load factor (LF) of 0.8, operate for 8,760hrs/year

•Estimated Savings: $983/year•Estimated Cost: $4,505•Simple payback period: 4.6years•This analysis assumed that the City will provide their own labor.

OPtion2C: Replace the Existing Motor with OPtion2C: Replace the Existing Motor with Energy Efficient MotorEnergy Efficient Motor

SAVINGS FROM RESET CHILLED WATER SAVINGS FROM RESET CHILLED WATER TEMPERATURETEMPERATURE

Option 3: R eset Chilled Water Temperature

Estimated Savings: $ 2,937/yearEstimated Cost: $ 3,000Simple payback period: 1 yearThis analysis assumed that the City will provide

their own labor.

Conservation Measure Cost Savings(KWh)/yr Savings/yr

Replacing T12 with T8 Lamps

$ 35,737 131,117 $ 7,867

*Replacing 75 hp motor with energy efficient motor

$ 4,505* 16,383* $ 983*

*Using VFD for 75hp motor instead of fixed drive

$ 10,500* 72250* $ 4,335*

Shutting AC unit for the Main building from 10pm-6pm and weekends

205250 $ 12,315

Reset Chiller water temperature

$ 3,000 48,950 $ 2,937

Total 38,737 385,317 $ 23,119

Percentage Savings per year = 13%

SUMMARYSUMMARY

GREENSBORO BB&T BUILDINGGREENSBORO BB&T BUILDING

• Building location Greensboro

• Built year 1973• Total Area 64,301 ft2

Energy Source Cost ($)Electricity $95,000Natural gas $43,000

Energy Cost Index =$2.15/ft2/year

•Estimated Savings: $ 10,884/year•Estimated Cost: $ 58,140•Simple payback period:

5.3 years

Floor Total Number of bulbs

Fixtures

Basement 236 155First 522 300Second 742 306Third 770 201Forth 978 511Total 3230 1,473

OPTION 1: REPLACE EXISTING LAMP OPTION 1: REPLACE EXISTING LAMP

WITH ENERGY EFFICIENT LAMPWITH ENERGY EFFICIENT LAMP

RETROFIT SAVINGS OPTIONSRETROFIT SAVINGS OPTIONS

Option2: Reset chilled water temperatureEstimated Savings: $ 2,670/yearEstimated Cost: $ 3,000Simple payback period: 1.2 yearsOption 3:Reset Hot water

temperatureEstimated savings: $750Estimated cost: $3,000 Estimated pay back: 4 years

RETROFIT SAVINGS FROM HVACRETROFIT SAVINGS FROM HVAC

Conservation Measure Cost Savings(KWh)/yr

Dollar Savings/yr

Replacing T12 with T8 Lamps

$58,140 181,400 $ 10,884

Reset Chiller water temperature

$ 3,000 44,500 $ 2,670

Reset Hot water temperature

$ 3,000 15,500 $ 750

Total $67,140 241,400 $14,304

SUMMARYSUMMARY

Percentage Savings per year = 8%

HIGH POINT COURTHOUSE & JAIL HIGH POINT COURTHOUSE & JAIL BUILDINGBUILDING

High-Point Courthouse Front View

• Building location High Point• Built year 1988• Total Area 227,044 ft2

• Annual Energy use 21,454MBTU

• Annual Energy Cost $346,612.29

Building Energy and Building Energy and Cost IndexCost Index•94.5 kBTU/SF/YR •1.5 $/kBTU/SF/YR

RETROFITSAVINGS OPTIONSRETROFITSAVINGS OPTIONS

Option 1: Replace the Existing Lamp with T8 25 wattEstimated Savings: $ 29,534Estimated Cost: $ 142,528Simple payback period: 4.8 yearsThis analysis assumed that the City will provide their own labor.

•Replacing T12, 34 watt fluorescence tubes with T8 25 watt and electronic ballast:•Number of fixtures in Detention Center = 780; burning continuously throughout the year•Number of fixtures in Courthouse = 1316; burning 12 hour/day and 5days a week

Option 2A: Repair/Replace controls in CourthouseEstimated Savings: $ 19,825/yrEstimated Cost: $ 129,600Simple payback period: 6.5 years

Option 2B: Repair/Replace Controls in Detention CenterEstimated Savings: $ 4,637/yrEstimated Cost: $ 204,750Simple payback period: 44.2yearsOption 2C: Add VFD to AHUs in the CourthouseEstimated Savings: $ 12,253Estimated Cost: $ 60,000/yrSimple payback period: 4.9 years

RETROFITSAVINGS FROM HVACRETROFITSAVINGS FROM HVAC

Option 2E: Install Water Side EconomizerEstimated Savings: $2000-3000Estimated Cost: $ 35,000Simple payback period: 17.5-11.7years

Option2D: ReplaceVAV with Terminal Reheat in Courthouse with FPVAV Estimated Savings: $ 4,749Estimated Cost: $ 160,000Simple payback period: 33.7 years

*Option3 Installing Solar Panel in the Detention CenterEstimated Savings: $ 12,800.00/yr @ 65% efficiencyEstimated Cost: $250,000 and $300,000 ***Simple payback period: 19.5yearsThis system will offset 50 tons of CO2 per year.

Option2F : HVAC Re-Commissioning Estimated Savings: $1,413Estimated Cost: $60,000.00(DC)/

$82,500.00(CH)Simple payback period: years

Conservation Measure Cost Savings (kWh)/yrDollar

Savings/yr1. Replace Existing Lamps 142,528 492233 29,5342A. Repair/Replace Controls in Courthouse 129,600 330417 19,8252B. Repair/Replace Controls in Detention Center 204,750 77283 4,6372C. Add VAV to AHUs 60,000 204217 12,2532D Replace VAV with FPVAV 160,000 79150 4,7492E Install Water Side Economizer 35,000 33,333-50,000 2000-3000

2 F Re-commissioning HVAC60,000(DC)82,500(CH) 23550 1,413

SUMMARYSUMMARY

• Building location High Point

• Built year 1990• Total Area 34,446 ft2

HIGH POINT PUBLIC HEALTH BUILDINGHIGH POINT PUBLIC HEALTH BUILDING

Building Energy and Building Energy and Cost IndexCost Index•190.81 kBTU/SF/YR •$3.32/kBTU/SF/YR

Option 1: Replace T12, 34 watt fluorescence tubes with T8 25 watt and electronic ballast:Estimated Savings: $ 5,647.00/yearEstimated Cost: $ 21,119.00Simple payback period: 4.0 years

Option 2: Reset Chilled Water from Outside AirEstimated Savings: $ 1446.00/yearEstimated Cost: $ 3,000.00Simple payback period: 2.1yearsThis analysis assumed that the City will provide their own labor

SAVINGS FROM RETROFITSAVINGS FROM RETROFIT

•Repair and Use the Existing Solar Water Heaters Estimated Savings: $ 983/yearEstimated Cost: $ 4505.00Simple payback period: 4.6yearsThis analysis assumed that the City will provide their own labor

SAVINGS FROM RETROFITSAVINGS FROM RETROFIT

Conservation Measure CostSavings (kWh)/yr

Dollar Savings/yr

1. Replace Existing Lamps 21,119 94117 5,6472. Reset Chilled Water from OA 3000 24100 14463.Repair and Used the Existing Solar Thermal System 4,505 16383 983

SUMMARYSUMMARY

NEXT STEPS

• COMPLETE FINAL REVIEW OF IDENTIFIED MEASURES

• SELECT MEASURES TO BE IMPLEMENTED

• IDENTIFY FUNDING SOURCES

• OBTAIN DESIGN ASSISTANCE WHERE NEEDED TO IMPLEMENT MEASURES