Transcript Duke - Laughing Bear Newsletter

Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
DU-109-PP
PLANT HVAC SYSTEMS
 PURPOSE
 The purpose of the Operations and Maintenance Training Program
is to train Operations and Maintenance Technicians in the operation
of the Duke University Plant Heating, Ventilation, and Air
Conditioning (HVAC) Systems.
 OBJECTIVES
 Trainees will demonstrate knowledge of
– HVAC System Components
– HVAC System Components Operation
– HVAC System Configuration
– HVAC System Controls and Instrumentation
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 PURPOSE
 The purpose of the Heating, Ventilation, and Air Conditioning
(HVAC) System is to:
– Provide heat and cooling climate control for plant, office/control
room, and electrical room areas of the steam and chiller plants
– Maintain Interior Air Quality (IAQ)
– Maintain air pressure
– Provide emergency exhaust
Duke
Facilities Management
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PLANT HVAC SYSTEMS
 HVAC AIR FUNCTIONS
 To understand how HVAC works, you need to be familiar with the
six functions of HVAC air.
 Return Air
– Air inside the building drawn back into the air handlers
 Outside Air
– Fresh air drawn into the air handlers from outside
 Supply Air
– Air blown into the building from the air handlers
Duke
Facilities Management
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PLANT HVAC SYSTEMS
 HVAC AIR FUNCTIONS
 Makeup Air
– Air blown into the building by Makeup Air Unites (MAUs) to
maintain air pressure balance when pressure is low
 Relief Air
– Air exhausted from the building to maintain air pressure balance
when air pressure is high
 Exhaust Air
– Air expelled to remove contaminants from areas where
chemicals, hazardous materials, and toxic gases are present
– Air exhausted from the building in case of emergency
Duke
Facilities Management
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PLANT HVAC SYSTEMS
 WHY AIR BALANCE IS IMPORTANT
 Over Pressure and Under Pressure conditions negatively affect
building efficiency.
 Over Pressure
– When air pressure inside a building is higher than pressure
outside, the conditioned air inside the building is pushed
outside.
– High air pressure can require excess energy to condition the air
in the building and compensate for energy lost.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 WHY IS AIR BALANCE IMPORTANT?
 Under Pressure
– When building pressure is lower than pressure outside, the air
outside is drawn inside.
– Outside air may come from undesirable sources (trash bins,
open doors, cracks, construction, and so forth).
– Unfiltered or unconditioned air can affect the HVAC system’s
ability to maintain the desired environment.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What does IAQ stand for?
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Duke
International Air Quality
Industrial Air Quality
Interior Air Quality
In-duct Air Quality
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 IAQ stands for Interior Air Quality.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What kind of air is blown into building from air handlers?
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Duke
Return Air
Outside Air
Makeup Air
Supply Air
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 Supply Air is recirculated through the air handlers.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What kind of air is added when air pressure is low?
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Duke
Return Air
Outside Air
Makeup Air
Supply Air
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 Makeup Air is blown into a building when air pressure is
low.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What causes Over Pressure?
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Duke
Pressure is higher on the lower level than on the mezzanine
Pressure is lower in the building than outside
Pressure is higher in the building than outside
Pressure is lower on the lower level than on the mezzanine
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 Over Pressure is the condition when pressure inside the
building is higher than outside.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What causes Under Pressure?
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Duke
Pressure is higher on the lower level than on the mezzanine
Pressure is lower in the building than outside
Pressure is higher in the building than outside
Pressure is lower on the lower level than on the mezzanine
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 Under Pressure is the condition when pressure inside
the building is lower than outside.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 PLANT HVAC COMPONENTS
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Air Handler Units (AHUs)
Makeup Air Units (MAUs)
Fan Coil Units (FCUs)
Exhaust fans
Supply fans
Emergency exhaust fans
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 AHU COMPONENTS
 The Mixing Box section contains:
– Return Air Damper which connects to the Return Air Duct
• The Relief Air Damper also connects to the Return Air Duct
– Outside Air Damper which connects to the duct to the building
exterior
RETURN AIR
DAMPER
RELIEF AIR
DAMPER
OUTSIDE AIR
DAMPER
MIXING BOX
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 AHU COMPONENTS
 The Filter section contains:
– Access door for filter element replacement
– W.C. Meter mounted in door
• Filter is replaced when air pressure reaches maximum resistance
RETURN AIR
W.C. METER
RELIEF AIR
OUTSIDE AIR
FILTER
Duke
Facilities Management
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MIXING BOX
PLANT HVAC SYSTEMS
 AHU COMPONENTS
 The Cooling Coil section contains:
– In and Out connections for chilled water
– Cooling coil heat exchanger
RELIEF AIR
RETURN AIR
OUTSIDE AIR
Duke
COOLING FILTER
COIL
Facilities Management
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MIXING BOX
PLANT HVAC SYSTEMS
 AHU COMPONENTS
 The Heating Coil section contains:
– In and Out connections for steam
– Heating coil heat exchanger
RETURN AIR
RELIEF AIR
COOLING
COIL
OUTSIDE AIR
HEATING
COIL
Duke
Facilities Management
Utilities & Engineering Services
FILTER
MIXING BOX
PLANT HVAC SYSTEMS
 AHU COMPONENTS
 The Fan section contains:
– Fan and motor
– Starter Box mounted on
exterior or nearby
RETURN AIR
OUTSIDE AIR
Duke
HEATING
COIL
Facilities Management
Utilities & Engineering Services
COOLING FILTER
COIL
MIXING BOX
PLANT HVAC SYSTEMS
 QUESTION
 What is accomplished in the AHU mixing box?
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Duke
Return air is mixed with relief air
Supply air is mixed with return air
Supply air is mixed with outside air
Return air is mixed with outside air
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 Return air is mixed with outside air in the AHU mixing box.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What kind of meter is mounted in the filter section door of an
AHU?
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Duke
Temperature sensor
Pressure gauge
W.C. meter
Anemometer
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 A W.C. meter is mounted in the door of the filter section. The
W.C. (Water Column) meter measures resistance through the
filter in inches to indicate when the filter needs to be
changed.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 Where is the starter box located for an AHU?
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Duke
Exterior of the fan section or nearby
Mixing box
Control Room
AHUs do not need starters
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 The starter box is mounted on the fan section of the AHU or
nearby.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 MAU COMPONENTS
 The Fan section contains:
– Fan and motor
– Outside Air Damper which connects to the duct to the building
exterior
OUTSIDE AIR
DAMPER
FAN
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 MAU COMPONENTS
 The Coil section contains:
– In and Out connections for
steam and chilled water
– Heating and cooling coil heat
exchangers
OUTSIDE AIR
DAMPER
HEATING COOLING
COIL
COIL
Duke
Facilities Management
Utilities & Engineering Services
FAN
PLANT HVAC SYSTEMS
 MAU COMPONENTS
 The Filter section contains:
– Filters
– Supply Air Damper
SUPPLY AIR
DAMPER
FILTER
OUTSIDE AIR
DAMPER
Duke
HEATING COOLING
COIL
COIL
Facilities Management
Utilities & Engineering Services
FAN
PLANT HVAC SYSTEMS
 MAU COMPONENTS
 The Starter box is located next to the MAU.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What is one way an MAU differs from an AHU?
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Duke
The MAU takes in return air and outside air
The MAU takes in relief air only
The MAU takes in outside air only
The MAU takes in return air only
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 The MAU takes in outside air only.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What does MAU stand for?
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Duke
Main Air Unit
Maximum Air Unit
Mini Air Unit
Makeup Air Unit
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 MAU stands for Makeup Air Unit.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What is another way an MAU differs from an AHU?
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Duke
The MAU has a mixing box
The MAU does not have a mixing box
The MAU has a cooling coil
The AHU has a cooling coil
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 The MAU does not have a mixing box.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 FCU COMPONENTS
 Outside Air Damper
 Electric Duct Heater
RETURN AIR
SUPPLY AIR
ELECTRIC DUCT
HEATER
OUTSIDE AIR DAMPER
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 FCU COMPONENTS
 Filter
 Cooling Coil
 Fan and Motor
FAN
COOLING COIL
FILTER
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What does the FCU use to heat supply air?
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Duke
Steam
Hot water
Electricity
Friction
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 The FCU uses an Electric Duct Heater to heat air in the supply
air duct.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What does FCU stand for?
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Duke
Forced Cooling Unit
Facilities Control Unit
Furnace Coil Unit
Fan Coil Unit
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 FCU stands for Fan Coil Unit.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 PLANT HVAC SYSTEMS CONFIGURATION AND PROCESS FLOW
 The flow for Chiller Plant #2 is used as an example.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 Temperature Transmitters on the Return Air Duct, Supply Air Duct,
and Mixing Box of AHU-21 send readings to the Local Controller
Digital Control System (DCS).
LOCAL CONTROLLER
DCS
RETURN AIR DUCT
AHU-21
SUPPLY AIR DUCT
Duke
Facilities Management
Utilities & Engineering Services
MIXING BOX
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 The local DCS controls heating and cooling by modulating the
Cooling Coil chilled water control valve and the steam valve
supplying the Heating Coil.
LOCAL CONTROLLER
DCS
COOLING
COIL
HEATING
COIL
MIXING BOX
CHILLED WATER CONTROL VALVE
Duke
Facilities Management
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STEAM VALVE
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 The Outside Air Damper is set at 2,000 CFM.
 The Return Air Damper is set at 30,000 CFM.
SUPPLY AIR DAMPER
D-21E
AHU-21
MIXING BOX
Duke
Facilities Management
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OUTSIDE AIR DAMPER
D-21F
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 1,000 CFM exhausted continuously from Chemical Treatment area
by Exhaust Fan EF-23.
 350 CFM exhausted continuously from the Break Room, Men’s and
Women’s Restrooms, Shower, and Janitor’s Closet by Exhaust Fan
EF-24.
BREAK ROOM
JANITOR’S CLOSET
SHOWER
WOMEN’S RESTROOM
EXHAUST FAN
EF-24
EXHAUST TO OUTSIDE
MEN’S RESTROOM
LOUVER L-28
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 Supply Fans SF-21 and SF-22 run continuously to recirculate air
within the plant.
AHU-21
SUPPLY FAN
SF-21
SUPPLY FAN
SF-22
EF-24
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 Economizer Operation
 Based on outside air enthalpy and outside air temperature, when less
than 60°F AHU-21 operates in economizer cycle modulating the
outside and return air dampers to maintain 60°F supply air
temperature.
LOCAL CONTROLLER
DCS
RETURN AIR DAMPER
OUTSIDE AIR DAMPER
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 Economizer Operation
 The chilled water valve to AHU-21 is closed during economizer cycle.
 In the event of damper failure or mixed air temperature below 35°F,
a freezestat shuts down AHU-21 and sends an alarm.
LOCAL CONTROLLER
DCS
FREEZESTAT
CHILLED WATER VALVE
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 Economizer Operation
 Relief Air Damper RD-21 is controlled by differential pressure to
maintain a 0.05 inch W.C. positive pressure in the building by
modulating the damper.
AHU-21
RELIEF DAMPER RD-21
Duke
PRESSURE SENSOR A7
AT 0.05” W.C.
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 Emergency Exhaust
 During emergency when refrigerant accumulates above 100 PPM due
to leak or rupture, air recirculation dampers to Exhaust Fans EF-21 and
EF-22 close and exhaust dampers open forcing the refrigerant from
the building.
EMERGENCY
EXHAUST DAMPER
L-26
EMERGENCY
EXHAUST DAMPER
L-25
SOUTH
EMERGENCY
EXHAUST
EF-22
NORTH
EMERGENCY
EXHAUST
EF-21
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 Emergency Exhaust
 Supply Fans SF-21 and SF-22 shut down.
 The outside air damper to AHU-21 opens fully and the return air
damper closes.
 Additional outside air (30,000 CFM) brought into the building from
AHU-21 is exhausted through Positive Relief Damper RD-1.
 When the refrigerant detectors no longer sense a low refrigeration
concentration of 100 PPM, exhaust air dampers to EF-21 and 22 close
and the air recirculation dampers open. SF-21 and 22 then energize
and AHU-21 returns to a modulating damper cycle.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-21 SYSTEM
 Emergency Exhaust
 If an emergency occurs when the supply air temperature is less than
60°F, a temperature sensor opens steam valve TCV-AHU-21B to
maintain a supply air temperature of 60°F.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 Based on outside air enthalpy and outside air temperature,
what is the lowest temperature at which AHU-21 will operate
before entering the economizer cycle?
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Duke
80°F
40°F
60°F
72°F
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 Based on outside air enthalpy and outside air temperature,
when less than 60°F AHU-21 operates in economizer cycle.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 When do Supply Fans SF-21 and SF-22 run?
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Duke
Only when building pressure is low
Continuously
Only when building pressure is high
Only at night
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 Supply Fans SF-21 and SF-22 run continuously to recirculate
air within the plant.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 Where do the temperature transmitters on the ducts and
mixing box on AHU-21 send readings?
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Duke
Local Controller DCS
AHU-22
Directly to the Control Room
Chiller Plant #1
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 Temperature Transmitters on the Return Air Duct, Supply Air
Duct, and Mixing Box of AHU-21 send readings to the Local
Controller Digital Control System (DCS).
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-22 SYSTEM
 AHU-22 supplies 10,000 CFM of cooling to the Electric Room.
 The local DCS modulates the cooling coil chilled water valve in response to
temperature sensors in the supply and return air ducts and mixing box.
LOCAL CONTROLLER
DCS
COOLING
COIL
COOLING COIL CHILLED
WATER VALVE TCV-AHU22A
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-22 SYSTEM
 The Outside Air Damper is set at 9,940 CFM.
 60 CFM is exhausted continuously through the Gravity Relief Damper in
the mezzanine floor.
OUTSIDE AIR
DAMPER
L-23
AHU-22
GRAVITY RELIEF
DAMPER
RD-22
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-22 SYSTEM
 Economizer Operation
 Based on outside air enthalpy and outside air temperature, when less
than 60°F AHU-22 operates in economizer cycle modulating the
outside and return air dampers to maintain 60°F supply air
temperature.
LOCAL CONTROLLER
DCS
OUTSIDE AIR DAMPER
RETURN AIR DAMPER
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-22 SYSTEM
 Economizer Operation
 Relief Air Damper RD-21 is controlled by differential pressure to
maintain a 0.05 inch W.C. positive pressure in the building by
modulating the damper.
RELIEF DAMPER RD-21
PRESSURE SENSOR A7
AT 0.05” W.C.
AHU-22
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 AHU-22 SYSTEM
 Economizer Operation
 The chilled water valve to AHU-22 is closed during economizer cycle.
 In the event of damper failure or mixed air temperature below 35°F,
a freezestat shuts down AHU-22 and sends an alarm.
LOCAL CONTROLLER
DCS
FREEZESTAT
CHILLED WATER VALVE
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What area is cooled by AHU-22?
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Duke
Control Room
Janitor’s closet
Chemical Treatment Area
Electric Room
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 AHU-22 cools the Electric Room.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 Where Is the Gravity Relief Damper located?
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Duke
Control Room
Mezzanine floor
Electric Room
Operating floor
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 The Gravity Relief Damper is in the mezzanine floor.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 What volume of cooling air is supplied to the Electric Room by
AHU-22?
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Duke
1,250 CFM
2,000 CFM
10,000 CFM
30,000 CFM
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 AHU-22 supplies 10,000 CFM of cooling to the Electric Room.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 FCU-21 SYSTEM
 FCU-21 supplies 1,285 CFM of cooling to the Control Room, break
room, office, and vestibule.
 Cooling is controlled by modulating the cooling coil chilled water
valve in response to a temperature sensor in the Control Room.
LOCAL CONTROLLER
DCS
CONTROL ROOM
Duke
COOLING COIL CHILLED
WATER VALVE
FCU-21A
Facilities Management
Utilities & Engineering Services
COOLING
COIL
PLANT HVAC SYSTEMS
 CHILLER PLANT #2 FCU-21 SYSTEM
 Outside air is set at 175 CFM during cooling with 1,110 CFM of return air.
 Heating is provided by a 6 KW Electric Duct Heater located in the supply
air duct.
ELECTRIC DUCT
HEATER DH-21
FCU-21
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 Where is the Electric Duct Heater located?
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Duke
In the return air duct
In the supply air duct
In the relief air duct
In the makeup air duct
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 The Electric Duct Heater is located in the supply air duct.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 Which of the following areas is cooled by FCU-21?
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Duke
Operating floor
Chemical treatment area
Electric Room
Control Room
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 FCU-21 supplies cooling to the Control Room, break room,
office, and vestibule.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 OPERATIONS MONITORING
– Operation of the Plant HVAC Systems is monitored through the Control
Room on the top floor of Chilled Water Plant #2.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 PLANT ROUNDS
– During an Operator’s routine shift, Rounds are accomplished to
record key information and visually assess HVAC 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.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 EXAMPLE ROUNDS SHEET (front and back)
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 HVAC DAILY ROUNDS
– Chiller Plants #1 and #2
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•
•
•
•
•
Duke
Outside temperature
Outside humidity
Outside enthalpy
AHU (On/Off)
Supply Fans (On/Off)
Exhaust Fans (On/Off)
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 HVAC DAILY ROUNDS
– West and East Campus Steam Plants
• Outside temperature
• AHU
• Online/Offline
• Space temperature
• Supply air temperature
• Supply Fan
• Online/Offline
• Space temperature
• Supply air temperature
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 HVAC DAILY ROUNDS
– West and East Campus Steam Plants
• Exhaust Fan (not all exhaust fans are checked for all conditions)
•
•
•
•
•
•
Duke
Online/Offline
Space temperature
Supply air temperature
Firm alarm OK
Gas alarm OK
E-Stop alarm OK
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 TYPICAL PROBLEMS ASSOCIATED WITH PLANT HVAC
SYSTEMS
– Stuck dampers
• Most likely cause is corrosion or debris
– Blocked coils
• Most likely cause is corrosion, faulty filters
– Malfunctioning control components
• Components damaged or out of calibration
– Clogged condensate drains
• Most likely cause is debris or damage to pipes
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 Where does Operations Monitoring take place?
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Duke
Control Room in each steam plant
Control Room in West Campus Steam Plant
Control Room in Chilled Water Plant #2
Control Room in Chilled Water Plant #1
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 Operations Monitoring takes place In the Control Room in
Chilled Water Plant #2.
Duke
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 QUESTION
 Which air pressure condition in a building is preferable?
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Duke
Under Pressure
Over Pressure
Balanced
Air pressure is not a concern of HVAC
Facilities Management
Utilities & Engineering Services
PLANT HVAC SYSTEMS
 ANSWER
 Operations Monitoring takes place In the Control Room in
Chilled Water Plant #2.
Duke
Facilities Management
Utilities & Engineering Services