facilities management utilities & engineering services duke chwp-2 reclaim water du-107-pp
TRANSCRIPT
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CHWP-2 RECLAIM WATER
DU-107-PP
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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
RECLAIM WATER SUPPLYCreek and WellsAHU Cooling Coil CondensateStorm WaterReclamation PondRainwater
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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
QUESTIONHow many millions of gallons of water are saved by
reclaiming rainwater?– 7.4– 22– 9– 14
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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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
CHWP-2 RECLAIM WATER CONFIGURATION AND PROCESS FLOW
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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
ANSWERWhen the water level in the tanks reaches 4 feet, the reclaim
pumps turn on.
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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
QUESTIONReclaim water supplies what and irrigation?
– Hospital– Reclamation pond– Creek– Cooling tower basin
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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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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CHWP-2 RECLAIM WATER
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.