national building commissioning conference - bcxa.org · chilled water plant design... new “rules...
Post on 03-Apr-2018
225 Views
Preview:
TRANSCRIPT
s u s t a i n a b I l I t y
EarthWise™ Systems National Building Commissioning Conference April 22, 2008
Kenyon HolmesSenior Account Executive
Southern California Trane
s u s t a i n a b I l I t y
EarthWise™ Systems?
EmissionsEmissions
EnergyEnergy EfficiencyEfficiency
s u s t a i n a b I l I t y
Clinton Climate Initiative
“Goal: to Reduce Carbon Emissions and Increase Efficiency In Largest Cities Across the World”
$5 Billion Dollars - 40 major Cities
s u s t a i n a b I l I t y
Buildings use 39% of the Primary Energy Consumed in the United States
s u s t a i n a b I l I t y
U.S. Buildings = 9.8 percent of Total Global CO² Emissions
s u s t a i n a b I l I t y
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?
s u s t a i n a b I l I t y
Low Flow, Low Temperature, High Efficiency Systems
+/+/--$$air handlers
+/+/--$$
+/+/--$$controls
chillers+/+/--$$piping
~/~/––$$
ductwork
~/~/––$$
s u s t a i n a b I l I t y
How?
Temperature differential
Supply temperature Flow rates Fans
Ductwork
Pump
Piping
s u s t a i n a b I l I t y
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
s u s t a i n a b I l I t y
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
s u s t a i n a b I l I t y
ChillerCooling towerWater pumps
Chilled Water/VAV Systems
1970’s
73%
9%
18%
2007
51%
31%
17%
s u s t a i n a b I l I t y
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
s u s t a i n a b I l I t y
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
s u s t a i n a b I l I t y
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
s u s t a i n a b I l I t y
Yeah, but….
Cold downdrafts
Condensation
s u s t a i n a b I l I t y
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...
s u s t a i n a b I l I t y
Linear Slot Diffuser vs. Typical
s u s t a i n a b I l I t y
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
s u s t a i n a b I l I t y
Optimized Controls
s u s t a i n a b I l I t y
Fan Pressure Optimization
s u s t a i n a b I l I t y
Fan Pressure Optimization
s u s t a i n a b I l I t y
Pump Pressure Optimization
s u s t a i n a b I l I t y
Wireless zone sensors
Auto-commissioning
Auto-calibration
next generation VAV box control Capabilities That Are Available Today!!
s u s t a i n a b I l I t y
Reduce installed costLower riskAbility to handle churn
Wireless Zone Sensors
s u s t a i n a b I l I t y
Auto-Commissioning
Do you remember? Retro-commissioning…Why not automatically?
s u s t a i n a b I l I t y
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
s u s t a i n a b I l I t y
Graphical Interface Floor Plan
s u s t a i n a b I l I t y
Floor Plan
s u s t a i n a b I l I t y
Chiller-Water VAV Systems
s u s t a i n a b I l I t y
Chiller-Water VAV Systems
s u s t a i n a b I l I t y
Yeah but, show me the money!
s u s t a i n a b I l I t y
New Construction Project
J. D. Edwards, Denver, CO
Owner occupied office campus
Each building 190,000 sq. ft
s u s t a i n a b I l I t y
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
s u s t a i n a b I l I t y
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
s u s t a i n a b I l I t y
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
$576,768
Difference55°F cost45°F costItem
s u s t a i n a b I l I t y
Total System Installed Cost
airside
wetside
subtotals
electrical (airside)
electrical (wetside)
total
($ 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
s u s t a i n a b I l I t y
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%
s u s t a i n a b I l I t y
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
s u s t a i n a b I l I t y
Questions or Comments?
top related