“condenser water heat recoverycondenser water pump chilled water pump cooling tower 3-way bypass...
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““Condenser Water Heat Condenser Water Heat Recovery"Recovery"
Julian de BulletASHRAE Distinguished Lecturer
Director of Industry Relations
McQuay International
703-395-5054
PLEASE MUTE CELL PHONES
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What Is Sustainability ?
“ sustainable development meets the needsof today without compromising the ability of future generations to meet their own needs”
World Commission on Environment and Development 1987
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ASHRAE Position
“supports building sustainability as a means to provide safe, healthy, comfortable indoor environment while simultaneously limiting the impact on the Earth’s natural resources”
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Why Sustainable Design?
• Buildings In The US Consume 39% Of Our Total Energy
• 70% Of Our Electricity Annually• 5 Billion Gallons Potable Water Per Day For
Toilets• Typical Construction Generates 2.5 lbs. Of
Solid Waste Per Square Foot• High Performance Building Practices Can
Reduce These Negative Environmental Impacts
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• 6 Sections of LEED– Sustainable Sites– Water Efficiency– Energy & Atmosphere– Materials & Resources– Indoor Environmental Quality– Innovation & Design Process
What Is LEED?
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ASHRAE Standard 90.1
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Single Chiller Design
2400 Usgpm 95F
Cooling Tower40 kW
800 Ton Load3 Way Valves
44F Chilled WaterSupply
85FSupply To Chiller
800 Ton Chiller0.55 kW/ton
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Range Vs. Supply Water Temperature
• Change To 14F Range– Smaller Pumps, Pipes etc.
• Maintain Supply Water Temperature
• LMTD Increases– Improves Chiller
Performance• Hurts Chilled Water Coil
Performance– Deeper Coils Required– Increased Fan Static
Pressure
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Why Consider Heat Recovery?
• Green Is GoodConservation of Natural Resources
• Lower Annual Energy Usage– Reduce Operating Cost
• Provide a Good Life Cycle Analysis
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Green
• ANSI/ASHRAE/IESNA Standard 90.1– LEED requires you comply with 90.1 and
exceed it for more points.– LEED requires some water conservation and
reducing evaporation from towers qualifies.– Heat Recovery chiller in the condenser
stream reduces water evaporation.
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Heat Recovery Requirements
• The Potential Heat Recovery At Any Point In Time Is The Lesser Of The Heat Source Or The Heat Load
Simultaneous Heating And CoolingSimultaneous Heating And Cooling
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
BTU
/ft2
Cooling Heating
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Critical !!!
Must have a heat sourceMust have a heat source
Cooling & heating loads are coincidentCooling & heating loads are coincident
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Single Condenser HR Design
Heat ExchangerPump
Heat Exchanger
Condenser WaterPump
Chilled WaterPump
Cooling Tower
3-Way BypassValve
Boiler Loop
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Split Condenser HR Design
Boiler Loop
Heat RecoveryPump
3 Way BypassValve
Cooling Tower
Chilled WaterPump
Split CondenserHeat Recovery
Chiller
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Looks like a normal chiller!
They are!!!
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Heat Pump Chiller Design
3-Way BypassValve
Cooling Tower
Heat Pump
Pump85 °F
85 °F95 °F
Std. Chiller
140 °F130 °F
Boiler Loop
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Tertiary Loop Design
• Allows Different Flowrates And Temperature Ranges In HR Loop From Boiler Loop
• Can Reclaim Max. Energy• Isolates Loops• Pump Only Operates When
Required– Std 90.1 Requires Pump
Pressure Drop Exceeds 20 ft
Tertiary Loop10°F T.D
Main Loop20°F T.D.
DifferentTemperatures
Same Temperature
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Heat Recovery Design
• Generally Design Boiler Load Greater Than Design Chiller THR (Total Heat of Rejection)– Actual Design Heat Recovery Rate Requires Annual Energy
Analysis– Almost Never Boiler Or THR Design Capacity – Load Will Be Met By Combination Of HR And Boiler
• THR = 1.25 x Chiller Capacity• Only One Chiller Need Be HR Type In Multiple Chiller
Plant– Must Be First On, Last Off
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Heat Recovery Control
““During Heat Recovery Mode, Maintain Boiler During Heat Recovery Mode, Maintain Boiler Return Water Temperature At 95Return Water Temperature At 95ººFF””– Boiler Supply Water Temperature Will “Float” Depending On
Actual Heating Load In Building– 25% Boiler Load = 100°F SWT (5°F Temperature Range)
NotNot““During Heat Recovery Mode, Maintain Boiler During Heat Recovery Mode, Maintain Boiler
Supply Water Temperature At 105Supply Water Temperature At 105ººFF””– 25% Boiler Load = 100°F RWT– Entering Condenser WT will be 5°F Higher Than Above – Boiler Will Still Be Required– Same Amount Of Energy Will Be Recovered– Chiller will Work A Lot (10%) Harder
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Results
0
2000000
4000000
6000000
8000000
10000000
12000000
14000000
Chillers Pumps Towers Fans Boiler HW Pumps
kWh
Base Building Templifier HR ChillerHeat Pump
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Geothermal HeatingGeothermal Heating
65°F 55°F
120120°° -- 160160°°FF
ReheatReheatDomestic HeatDomestic HeatDomestic Hot H2ODomestic Hot H2OProcess HeatProcess Heat
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Heat Pump Benefits– Recovers Waste Heat
– Heats Water Economically
– Saves Water
– Saves Chemical Treatment
– Reduces Blowdown & Sewer Charges
– Improves Chiller Efficiency
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Analysis is a MUST!Analysis is a MUST
BIM
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