Facilities Management Utilities & Engineering Services Duke CHWP-2 RECLAIM WATER DU-107-PP.

Facilities ManagementUtilities & Engineering ServicesDuk

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CHWP-2 RECLAIM WATER

DU-107-PP


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PURPOSE The purpose of the Operations and Maintenance Training Program

is to train Operations and Maintenance Technicians in the operation of the Duke University Chiller and Steam Systems.

OBJECTIVES Trainees will demonstrate knowledge of

– Chilled Water Plant #2 (CHWP-2) Reclaim Water System Components

– CHWP-2 Reclaim Water System Components Operation– CHWP-2 Reclaim Water System Configuration– CHWP-2 Reclaim Water System Controls and Instrumentation


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PURPOSE The purpose of CHWP-2 Reclaim Water is to:

– Reduce dependence on City of Durham water– Reduce costs– Reduce impact on the environment – Prevent loss of services during drought conditions


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CHWP-2 RECLAIM WATER SYSTEM Reclaimed water supplies the CHPW-2 cooling tower basin. Reclaim

water comes from:– Air Handler Unit (AHU) cooling coil condensate– Wells– Creek– Storm drainage system and reclaim pond– Rainwater

The Control Room controls distribution of reclaim water to the cooling tower basin and irrigation system.


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WHY RECLAIM WATER? In 2007 drought conditions in

Durham NC reached record low levels in water supplies. Duke helped lead the response.

Duke University growth from 2006 – 2010 of 7.4%.

Central Chiller System load increase from 2005 – 2010 of 60%.

Duke University is the largest user of water in the City of Durham.


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At 30% of all water used, the Chilled Water System is the largest single consumer of water at Duke University.

CHWP-2 can use 100 million gallons of water per day.


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HOW DUKE HAS RESPONDED October 2007, Duke University convened Water Conservation

Steering & Working Groups, which analyzed all potable water use on campus.

In 2009 CHWP-2 underwent major renovation, resulting in Leadership in Energy & Environmental Design (LEED) Gold certification


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The reclaim water project supports the Governor Deval L. Patrick of North Carolina’s “Leading by Example” initiative (Executive Order 484).

As of 2010, 43 million gallons of water per year have been saved. When the Reclamation Pond is completed, an additional 100 million

gallons of water per year will be saved.


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RECLAIM WATER PRINCIPLES Reclaimed water is used for makeup feedwater and irrigation. The CHWP-2 Reclaim System

– Reduces reliance on City of Durham water– Saves money– Reduces waste and impact on the environment


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Water from the following sources is distributed through the CHWP-2 Reclaim Water System:– AHU cooling coil condensate– Two Wells– Creek – Storm Drainage System with Reclaim Pond(being constructed in-

stream during 2014)– Rainwater collected from the CHWP-2 rooftop


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QUESTIONHow much of all water used at Duke is consumed by the

Chilled Water System?– 9%– 15%– 30%– 25%


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ANSWER30% of all water used on campus is consumed by the Chilled

Water System.


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QUESTIONWhat Gold level certification has CHWP-2 been awarded?

– EPA– LEED– Malcolm Baldrige– NOA


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ANSWER In 2009 CHWP-2 underwent major renovation, resulting

in LEED Gold certification


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QUESTIONWhat was the percentage of growth for Duke University from

2006 to 2010?– 14.7%– 17.4%– 7.4%– 4.7%


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ANSWERDuke University grew by 7.4% between 2006 and 2010.


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QUESTIONThe reclaim water project supports which initiative of the

Governor of North Carolina?– Leading by Example– Keep North Carolina Green– Water Conservation Initiative– Esse Quam Videri


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ANSWERThe reclaim water project supports the Governor of

North Carolina’s “Leading by Example” initiative.


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QUESTIONWhat is LEED an acronym for?

– Land Environment Ecology Designation– Leading Ecologists to Energize our Destination– Leadership in Ecology and Energy Design– Leadership in Energy and Environmental Design


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ANSWERLeadership in Energy and Environmental Design


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PURPOSE Systems that make up the CHWP-2 Reclaim Water System efficiently

and responsibly supply water for:– The CHWP-2 Cooling Towers basin to help cool the basin and

provide makeup feedwater– Irrigation on campus


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SYSTEM COMPONENTS The Duke University CHWP-2 Reclaim Water System includes the

following equipment and locations:– Reclaim Water Supply– Reclaim Water Tanks– Reclaim Pumps – CHWP-2 Cooling Tower Basin– Irrigation System


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RECLAIM WATER SUPPLYCreek and WellsAHU Cooling Coil CondensateStorm WaterReclamation PondRainwater


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CREEK AND WELLS Reclaiming creek water saves 22 million gallons per year. Two wells save 1.5 million gallons per year


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AHU COOLING COIL CONDENSATE Reclaiming condensate from air handler cooling coils saves 15

million gallons per year.

CONDENSATE DRAIN


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STORM WATER Storm water runoff is collected in the storm drainage system. The storm drainage system consists of nearly 32 miles of storm

pipes and drainage ditches.


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RECLAMATION POND The storm water reclamation pond is being constructed in-stream of

the storm drainage system. The pond will save approximately 100 million gallons of water per

year.


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RAINWATER Rainwater is collected from the CHWP-2 roof and piped to the

Reclaim Tanks in the basement. Rainwater collected from campus buildings saves 9 million gallons

per year.


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QUESTIONWhat does reclaim water do in the cooling tower basin?

– Cools the basin and provides makeup feedwater– Preheats water in the basin and provides makeup feedwater– Reclaim water is not supplied to the basin– Rinses old feedwater from the basin and provides makeup

condensate


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ANSWERReclaim water cools the basin and provides makeup

feedwater.


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QUESTIONHow many millions of gallons of water may be saved annually

by the reclamation pond?– 22– 100– 15– 60


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ANSWERThe reclaim pond will save approximately 100 million

gallons of water per year.


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QUESTIONApproximately how many miles of storm pipes and

drainage ditches are in the storm drainage system?– 100– 25– 32– 17


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ANSWERThe storm drainage system consists of nearly 32 miles of

storm pipes and drainage ditches.


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QUESTIONHow many millions of gallons of water are saved by

reclaiming rainwater?– 7.4– 22– 9– 14


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ANSWERRainwater collected from campus buildings saves 9

million gallons per year.


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QUESTIONHow many millions of gallons of water are saved by

reclaiming creek water?– 7.4– 22– 32– 1.5


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ANSWERReclaiming creek water saves 22 million gallons per

year.


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QUESTION How many millions of gallons of water per year can be saved by

reclaiming condensate from AHU cooling coils?

– 22

– 32

– 9

– 15


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ANSWERReclaiming condensate from air handler cooling coils

saves 15 million gallons per year.


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RECLAIM WATER TANKS Reclaim Water Tanks 1 and 2 are located in the basement of

CHWP-2.


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RECLAIM PUMPS Reclaim Pumps P1 and P2 are located next to the Reclaim

Water Tanks.


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RECLAIM PUMP CONTROLS Manual controls for Reclaim Pumps P1 and P2 are located to

the right of the pumps.


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COOLING TOWER BASIN The cooling tower basin is located below the cooling towers.

EAST CAMPUS STEAM PLANT


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IRRIGATION SYSTEM Reclaim water reduces or eliminates reliance on City of Durham water for

landscape irrigation.

EAST CAMPUS STEAM PLANT


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QUESTIONWhere are the Reclaim Water Tanks located?

– Below the cooling towers– Outside CHWP-2– Control Room– Basement of CHWP-2


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AnswerReclaim Water Tanks 1 and 2 are located in the basement of

CHWP-2.


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QUESTIONWhere are the Reclaim Pumps located?

– Below the cooling towers– Control Room– Next to the Reclaim Water Tanks– Mezzanine


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ANSWERReclaim Pumps P1 and P2 are located next to the Reclaim

Water Tanks.


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QUESTIONWhere are the manual controls for the Condensate Reclaim

Pumps located?– Below the cooling towers– To the right of the pumps– Control Room– Outside CHWP-2


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ANSWERManual controls for the Condensate Reclaim Pumps P1 and P2

are located to the right of the pumps.


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CHWP-2 RECLAIM WATER CONFIGURATION AND PROCESS FLOW


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Reclaim water from AHUs, the creek, wells, and rainwater is collected in the Reclaim Water Tanks.

RECLAIM SUPPLY

RECLAIM WATER TANK 1 RECLAIM WATER TANK 2


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When the water level in the tanks reaches 4 feet, the reclaim pumps turn on, sending water to the CWP2A and CWP2B cooling tower basins.

When the level drops below 2 feet, the pumps automatically shut off.

CWP2A CWP2B RECLAIM WATER

RECLAIM PUMP P-1

RECLAIM PUMP P-2

TOWER FILL VALVE

TOWER FILL METER


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When the water level in the tanks reaches 4 feet, water is also pumped to the irrigation system.

IRRIGATION SYSTEM

IRRIGATION VALVE

IRRIGATION METER


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QUESTIONAt what level do the reclaim pumps turn on?

– 4 feet– 7 feet– 2 feet– 5 feet


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ANSWERWhen the water level in the tanks reaches 4 feet, the reclaim

pumps turn on.


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QUESTIONAt what level do the reclaim pumps automatically shut off?

– 4 feet– 7 feet– 2 feet– 5 feet


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ANSWERWhen the water level in the tanks reaches 2 feet, the reclaim

pumps automatically shut off.


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AHU COOLING COIL CONDENSATE FLOW Moisture laden air passes through the chilled

water coil.

CONDENSATE DRAIN

ENTERING AIR

CHILLED WATER COIL


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AHU COOLING COIL CONDENSATE FLOW The moisture condenses on the coil and is

captured in the drain pan.

CONDENSATE DRAIN

ENTERING AIR

CHILLED WATER COIL

CONDENSATE

DRAIN PAN


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AHU COOLING COIL CONDENSATE FLOW The booster pump injects condensate into

the condenser water line to the cooling tower basin.

CONDENSATE DRAIN

ENTERING AIR

CHILLED WATER COIL

CONDENSATE

DRAIN PAN

BOOSTER PUMP

CONDENSER PUMP

COOLING TOWER BASIN


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OPERATIONS MONITORING– Operation of the CHWP-2 Reclaim Water System is monitored through

the Control Room on the top floor of CHWP-2.– The Digital Control System (DCS) provides operators with information

on system operation and control over system parameters.


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PLANT ROUNDS– During an Operator’s routine shift, Rounds are accomplished to

record key information and visually assess Chilled Water System operation.

– Each Plant has a Rounds Sheet to be filled out by the Operator.– Each plant has different requirements for plant rounds.– The information is recorded, not only for the current status, but

also to record system trends.


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CHWP-2 DAILY ROUNDS– The following is recorded, during operator rounds, specifically

for the CHWP-2 Reclaim Water System:• Tank #1 Level (inches)• Tank #2 Level (inches)• Reclaim Pump P-1 (ON/OFF)• Speed (HZ/Amps)• Reclaim Pump P-2 (ON/OFF)• Speed (HZ/Amps)• Suction PSI• Discharge PSI


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EXAMPLE CHWP-2 ROUNDS SHEET (front and back)


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TYPICAL PROBLEMS ASSOCIATED WITH CHWP-2 RECLAIM WATER– Reclaim pumps leaking

• Most likely cause is packing failure.– Failed Flow Meters

• Most likely cause is failure or clogging of meter.– Flooding of basement

• Most likely cause is sump pump has failed or drain is clogged.

– Failed Flow Control Valves• Most likely cause is clogged valve or failed actuator


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QUESTIONWhere does Operations Monitoring take place?

– Control Room in each steam plant– Control Room in West Campus Steam Plant– Control Room in CHWP-2– Control Room in CHWP-1


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ANSWER In the Control Room in CHWP-2


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QUESTIONWhy is it necessary to reclaim water?

– Reduce dependence on city water– Reduce costs– Reduce impact on the environment– All of the above


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ANSWERAll of the above. The purpose of CHWP-2 Reclaim Water

is to reduce the dependence on city water, reduce costs, reduce impact on the environment.


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QUESTIONReclaim water supplies what and irrigation?

– Hospital– Reclamation pond– Creek– Cooling tower basin


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ANSWERReclaim water supplies the cooling tower basin as

makeup.


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QUESTIONHow many millions of gallons of water can CHWP-2 use in a

day?– 7.4– 100– 15– 60


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ANSWERCHWP-2 can use 100 million gallons of water per day.


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QUESTIONHow many water reclaim tanks are located in CHWP-2?

– 4– 1– 2– 10


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ANSWERTwo water reclaim tanks are located in CHWP-2.


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QUESTIONHow many water reclaim pumps are located in CHWP-2?

– 4– 1– 2– 10


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ANSWERTwo water reclaim pumps are located in CHWP-2.


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QUESTION In which year did drought conditions in Durham NC reach

record low levels and stimulate Duke’s response?– 2006– 2007– 1998– 2001


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ANSWER In 2007 drought conditions in Durham NC reached

record low levels in water supplies. Duke helped lead the response.


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QUESTIONHow much did the Central Chiller System’s load increase

between 2005 to 2010?– 30%– 15%– 60%– 7.4%


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ANSWERBetween 2005 and 2010 Central Chiller System load

increased 60%.


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QUESTIONWhere is the Reclamation Pond being constructed?

– Under the cooling towers– In-stream of the storm drainage system– In the basement– Eno River State Park


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ANSWERThe Reclamation Pond, is being constructed in-stream of

the storm drainage system.

Facilities Management Utilities & Engineering Services Duke CHWP-2 RECLAIM WATER DU-107-PP.

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Transcript of Facilities Management Utilities & Engineering Services Duke CHWP-2 RECLAIM WATER DU-107-PP.