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EarthWise™ Systems National Building Commissioning Conference April 22, 2008

Kenyon HolmesSenior Account Executive

Southern California Trane

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EarthWise™ Systems?

EmissionsEmissions

EnergyEnergy EfficiencyEfficiency

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Clinton Climate Initiative

“Goal: to Reduce Carbon Emissions and Increase Efficiency In Largest Cities Across the World”

$5 Billion Dollars - 40 major Cities

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Buildings use 39% of the Primary Energy Consumed in the United States

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U.S. Buildings = 9.8 percent of Total Global CO² Emissions

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Number of EarthWise SystemsChilled water/VAV systems

Low flow, low temperaturehigh efficiency systems• What do they do?

• How do they do it?

• Why use them?

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Low Flow, Low Temperature, High Efficiency Systems

+/+/--$$air handlers

+/+/--$$

+/+/--$$controls

chillers+/+/--$$piping

~/~/––$$

ductwork

~/~/––$$

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How?

Temperature differential

Supply temperature Flow rates Fans

Ductwork

Pump

Piping

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Why Use LLH Systems?Good for business: Offers the potential to lower first cost and/orand/or operating cost whileenhancing comfort, IAQ, and acousticsEnvironmentally responsible: Reduced utility generated greenhouse gas emissions and uses less natural resourcesIdeal for use in health care, institutional, governmental, office building, education, and other markets where VAV systems are used

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Chilled Water/VAV Systems

% o

f HVA

C e

nerg

y co

nsum

ptio

n

83%93%70%83%89%80%

Trane EarthWise™ System

AtlantaMinneapolisLos AngelesDenverPhiladelphiaPortland

100%100%100%100%100%100%

Conventional System

100

95

90

85

80

75

70

65

60

LEED®

EAc1

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ChillerCooling towerWater pumps

Chilled Water/VAV Systems

1970’s

73%

9%

18%

2007

51%

31%

17%

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8.0

ASHRAE Standard 90.1

Chill

er e

ffic

iency

, CO

P

6.0

4.0

2.0

0.0“best”

available

Centrifugal >600 tonsScrew 150-300 tonsScroll <100 tonsReciprocating <150 tons

1977 1980 1989 1999

History of Chiller Performance

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chilled water plant design...

Old “rules of thumb”44°F chilled water supply

10°F delta T across the evaporator -that’s at 2.4 GPM/ton

10°F delta T across the condenser -that’s at 3.0 GPM/ton

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chilled water plant design...

New “rules of thumb”41°F chilled water supply

16°F delta T across the evaporator -that’s at 1.5 GPM/ton

15°F delta T across the condenser -that’s at 2.0 GPM/ton

Potentially downsized the cooling tower

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Yeah, but….

Cold downdrafts

Condensation

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three keys to… Eliminating Cold Downdrafts

Parallel fan-powered units on the perimeter…

Cooling-only boxes on the interior…

Both with linear slot aspirating diffusers...

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Linear Slot Diffuser vs. Typical

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What about Condensation?

Cold surfaces must be kept inside the humidity controlled envelope

Night set back and morning pull down controlled off of “interior dew point”

Positive building pressure is critical for “no” condensation and IAQ

Install a vapor barrier with reasonable construction

Design the “P” traps and pitch the condensate drains correctly LEED - WEc1.2

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Optimized Controls

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Fan Pressure Optimization

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Fan Pressure Optimization

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Pump Pressure Optimization

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Wireless zone sensors

Auto-commissioning

Auto-calibration

next generation VAV box control Capabilities That Are Available Today!!

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Reduce installed costLower riskAbility to handle churn

Wireless Zone Sensors

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Auto-Commissioning

Do you remember? Retro-commissioning…Why not automatically?

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Auto-Calibration

Automatically calibrates the flow transducer, air valve, and hot-water valve• Calibration occurs on the transition to unoccupied

The calibration can also be scheduled• Necessary for 24/7 applications

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Graphical Interface Floor Plan

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Floor Plan

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Chiller-Water VAV Systems

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Chiller-Water VAV Systems

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Yeah but, show me the money!

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New Construction Project

J. D. Edwards, Denver, CO

Owner occupied office campus

Each building 190,000 sq. ft

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Owner Focus: Reliability and Cost

Job specifics:

2 chillers at 250 tons each

7 size 40 AHUs, one per floor

240 fan-powered VAV boxes

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Waterside Installed Cost

labor

pipe and fitting

valves/special

insulation

pumps

chillers

cooling towers

electrical

total

($ 5,011)

($33,466)

($14,529)

($ 1,150)

($ 1,428)

$ 2,760*

($ 1,280)

($ 460)

($57,324) or

$.30/sq. ft.

$31,649

$88,177

$36,977

$ 7,038

$ 4,519

$26,639

$54,711

$22,448

$ 5,888

$ 3,091

Difference10°F ΔT18°F ΔTComponent

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Airside Installed Cost

labor

AHUs

VAVs

sheet metal

sub total

electrical

total

($6,759)

($28,176)

($6,868)

($16,362)

($58,164)

($5,950)

($64,114) or

$.34/sq. ft.

$174,715

$208,520

$165,242

$ 86,456

$634,932

$167,956

$180,343

$158,374

$ 70,095

$576,768

Difference55°F cost45°F costItem

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Total System Installed Cost

airside

wetside

subtotals

electrical (airside)

electrical (wetside)

total

($ 58,164)

($ 56,864)

($115,028

($ 5,950)

($ 460)

($121,438) or

.64/sq. ft.

$634,932

$168,361

$803,293

$576,768

$111,497

$688,265

Difference55°F cost45°F costItem

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Annual Energy Savings JD Edwards/First Cost Focus

supply fans

chillers

FVAV boxes

pumps

reheat with reset

total

6.8

(0.5)

(1.2)

0.7

(2.2)

$11,000

(890)

(1,940)

1,170

(3,700)

¢ per ft2DollarsComponent

3.6 or 4%

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What Did We Say Regarding Low Flow, Low Temperature, High Efficiency Systems?

What they do?

How they do it?

Why use them?Emissions

Energy Efficiency

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Questions or Comments?