earthwise powerbreakfast 2010
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Earthwise System and Green Mark Version 4 Update
,
8:00 to 11:00am
Venue: Riverfront Ballroom 1, Level 2
Lee Poh Seng
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EarthWise Systems?
EnergyEnergyEfficiencyEfficiency
EmissionsEmissions
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Number of EarthWise Systems
Chilled water/VAV systems
Low flow, low temperatureg e c ency sys ems
a o ey o
Wh use them?
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Low Flow, Low Temperature,High Efficiency Systems
+/+/--$$ ~/~/ $$
+/+/--$$
air handlers ductwork
--controls
--i in
~~
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chillers
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Number of EarthWise Systems
Chilled water/VAV systems
Low flow, low temperatureg e c ency sys ems
a o ey o
Wh use them?
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How?
Supply temperature Flow rates Fans
Ductwork
Temperature differential Pump
Piping
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Number of EarthWise Systems
Chilled water/VAV systems
Low flow, low temperatureg e c ency sys ems
a o ey o
Wh use them?
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Why Use LLH Systems?
Good for business: Offers the potential tolower first cost and/orand/oroperating cost whileenhancin comfort IAQ and acoustics
Environmentally responsible: Reduced utilitygenera e green ouse gas em ss ons anuses less natural resources
Ideal for use in health care, institutional,governmen a , o ce u ng, e uca on, another markets where VAV systems are used
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Chilled Water Systems
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Chilled Water Systems
9%
51%17%
Cooling tower
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History of Chiller Performance
8.0
PCentrifugal
y,
CO
6.0
Screw150-300 tons
icienc
Scroll
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Cool More or Pump More?
Pump efficiency 70%
COP 0.7
Chiller COP 7.0
Chiller COP 10x the pump COP
Conclusion work your most efficient
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Show Me the Impact
Cooling towers
Cooling coils
Pumps
Chillers
Air handlers
Controls
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waterside example
Cooling Tower Performanceons
95/85/78 98/83/78
2400 GPM 1600 GPM
10F range 15F range
7F approach
5F approach
40 hp
40 hp
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waterside example
Cooling Tower: Size?, Cost?
95/85/78 98/83/78 100/85/78
2400 GPM 1600 GPM 1600 GPM
10F range 15F range 15F range
7F approach 5F approach 7F approach
40 hp
40 hp
p
Same Tower Smaller Tower
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lessons learned
Cooling Tower Performance
!Tower waters ou e o
Towers should use
inverters
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Show Me the Impact
Cooling towers
Cooling coils
Pumps
Chillers
Air handlers
Controls
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Cooling Coil
MBH 504 504
WTR 10F 16F
.
.
GPM 101 63.0
.
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Chilled Water Pump (800 tons)
Flow rate 1920 gpm 1200 gpm
Pump head 110 feet
49 feet
Pump efficiency 80 pct
80 pct
Pump power 52 kW
16 kW
a 37.5% reduction in flow =
nearly 70% reduction in chilled waterum in ener consum tion
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lessons learned:
Cooling Cool Performance
!Chilled water
s ou e co
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Show Me the Impact
Cooling towers
Cooling coils
Pumps
Chillers
Air handlers
Controls
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Cooling Coil
MBH 504 504
WTR 10F 16F
.
.
GPM 101 63.0
.
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waterside example
Chiller Energy (800 tons)
Ca acit 800 tons
LWT 44F
Power 464 kW
Power 490 kW
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lessons learned
Chiller Performance
Factory witness tested
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Show Me the Impact
Cooling towers
Cooling coils
Pumps
Chillers
Air handlers
Controls
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Airside: What is different?
Common Low air
prac ce emp.sys em
Room setpoint 75F
77F
Airside delta T 20F 32F
Interior zone SAT 55F 55 60F
Lowers the re uired air flow b 30-40%
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air handler options
Fan Room Floor Area
$$$
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Air Handler Options
Air CFM area velocity velocity hp
55F 18,750 34.1 2514 550 17.8
45F 11,360 20.8 2225 546 12.8 , . .
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EarthWise System
Airside Benefits
ma er s, an co s, oxes
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What about Condensation?
Cold surfaces must be kept inside thehumidity controlled envelope
Night set back and morning pull down
no condensation and IAQ
Install a vapor barrier with reasonablecons ruc on
drains correctly LEED - WEc1.2
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HVAC Equipment
Draw-Thru Trapping
Total Trap Height T = D + H
where D = trap depth = H + dH = air-handler casing pressure + 1 in. wg
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d = drain pipe diameter
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For more information:
This document coversthese key points:
Provide a good moisture barrieraround controlled spaces
Put indoor HVAC equipment inside
Actively control the space dew
SYS-AM-15
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Show Me the Impact
Cooling towers
Cooling coils
Pumps
Chillers
Air handlers
Controls
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Optimized Controls
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Chiller tower optimization
400
kW
300
tion,
chiller
sum
200 control point
yco
100
ener
27 28 29 30 31260
32
con enser waer empera ure,
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EWS is a design processWaterside & Airside
Low flow
Low temperature
ductworkductworkair handlersair handlers
First Cost Operating Cost
+$+$con roscon ro s
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p png,pumps
p png,pumps
chillerschillers
++
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What Did We Say RegardingLow Flow, Low Temperature,
What they do?
How they do it? EnergyEfficiencyWhy use them?
Emissions
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ues ons or
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