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1 Condenser Water Heat Condenser Water Heat Recovery" Recovery" Julian de Bullet ASHRAE Distinguished Lecturer Director of Industry Relations McQuay International 703-395-5054 PLEASE MUTE CELL PHONES
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“Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

Mar 16, 2020

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Page 1: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 2: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 3: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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”

Page 5: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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

Page 6: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

• 6 Sections of LEED– Sustainable Sites– Water Efficiency– Energy & Atmosphere– Materials & Resources– Indoor Environmental Quality– Innovation & Design Process

What Is LEED?

Page 7: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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ASHRAE Standard 90.1

Page 8: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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Page 9: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 10: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 11: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 12: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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.

Page 13: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 14: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

Critical !!!

Must have a heat sourceMust have a heat source

Cooling & heating loads are coincidentCooling & heating loads are coincident

Page 15: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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Single Condenser HR Design

Heat ExchangerPump

Heat Exchanger

Condenser WaterPump

Chilled WaterPump

Cooling Tower

3-Way BypassValve

Boiler Loop

Page 16: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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Split Condenser HR Design

Boiler Loop

Heat RecoveryPump

3 Way BypassValve

Cooling Tower

Chilled WaterPump

Split CondenserHeat Recovery

Chiller

Page 17: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

Looks like a normal chiller!

They are!!!

Page 18: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 19: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 20: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 21: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 22: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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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

Page 23: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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Geothermal HeatingGeothermal Heating

65°F 55°F

120120°° -- 160160°°FF

ReheatReheatDomestic HeatDomestic HeatDomestic Hot H2ODomestic Hot H2OProcess HeatProcess Heat

Page 24: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

Heat Pump Benefits– Recovers Waste Heat

– Heats Water Economically

– Saves Water

– Saves Chemical Treatment

– Reduces Blowdown & Sewer Charges

– Improves Chiller Efficiency

Page 25: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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Analysis is a MUST!Analysis is a MUST

BIM

Page 26: “Condenser Water Heat RecoveryCondenser Water Pump Chilled Water Pump Cooling Tower 3-Way Bypass Valve Boiler Loop. 16 Split Condenser HR Design Boiler Loop Heat Recovery Pump 3

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