Pulse webinar, 5 HVAC Energy Wasters
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Transcript of Pulse webinar, 5 HVAC Energy Wasters
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Pulse Energy Webinar:
5 Common Energy
Wasters in HVAC Systems
3 Things You Want to Know About This Presentation
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• The presentation will be 45-60
minutes, including Q&A
• You can sand your questions to
us via the GoToWebinar control
panel at any time
• We are recording the webinar
Agenda
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• Intro
• 5 Common Energy Wasters• Bad marriage of pneumatic and electronic control
• Inappropriate temperatures in HW loops
• Duct leakage
• Simultaneous heating & cooling
• Forgotten overrides
• Quick overview of Pulse
• Q&A
Intro: James Smith
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• 18 years experience as a factory trained controls
technician
• Installed and serviced HVAC automation systems
for Siemens Building Technologies and Johnson
Controls in office towers, universities and
hospitals
• Presenting 5 common issues which lead to
energy waste
#1: Pairing Pneumatic & Electronic Control
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• Problem: DDC computer may not accurately
reflect the device position in the field
#1: Pairing Pneumatic & Electronic Control
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• Problem: DDC computer may not accurately
reflect device position in the field
#1: Pairing Pneumatic & Electronic Control
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• Problem: DDC computer may not accurately
reflect device position in the field
0 – 100% Open
0 – 5 VDC
#1: Pairing Pneumatic & Electronic Control
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• Problem: DDC computer may not accurately
reflect device position in the field
0 – 100% Open
0 – 5 VDC
• Reliable
• Repeatable
#1: Pairing Pneumatic & Electronic Control
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• Problem: DDC computer may not accurately
reflect device position in the field
0 – 100% Open
#1: Pairing Pneumatic & Electronic Control
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• Large stock of pneumatic devices
0 – 100% Open
#1: Pairing Pneumatic & Electronic Control
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• Problem: DDC computer may not accurately
reflect device position in the field
0 – 100% Open
0 – 5 VDC
0 – 20 PSI
3 – 8 PSI
#1: Pairing Pneumatic & Electronic Control
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• Problem: DDC computer may not accurately
reflect device position in the field
0 – 100% Open
0 – 5 VDC
4 – 9 PSI
3 – 8 PSI
#1: Pairing Pneumatic & Electronic Control
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• Problem: DDC computer may not accurately
reflect device position in the field
0 – 100% Open
0 – 5 VDC
4 – 9 PSI
3 – 8 PSI
#1: Pairing Pneumatic & Electronic Control
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• Problem: DDC computer may not accurately
reflect device position in the field
0 – 100% Open
0 – 5 VDC
0 – 20 PSI
3 – 8 PSI
#1: Pairing Pneumatic & Electronic Control
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• Problem: DDC computer may not accurately
reflect device position in the field
0 – 100% Open
0 – 5 VDC
0 – 20 PSI
3 – 8 PSI4 – 9 PSI
20 PSI
#1: Pairing Pneumatic & Electronic Control
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• One way to identify this problem: look for
unbelievable temperatures
0 – 100% Open
0 – 5 VDC
0 – 20 PSI
3 – 8 PSI4 – 9 PSI
20 PSI
#1: Pairing Pneumatic & Electronic Control
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• Possible solutions:
• schedule both trades to work together
• cross train
#2: Heating Water Loop Temperature
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• Problem: inappropriate water temperatures for
terminal units
#2: Heating Water Loop Temperature
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• Most Boilers
• Consider manufacturers limits
• Consider terminal units
#2: Heating Water Loop Temperature
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• Local set point
#2: Heating Water Loop Temperature
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• Reset based on external variable
#2: Heating Water Loop Temperature
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• Reset based on external variable
• Possible to use Valve positions
#2: Heating Water Loop Temperature
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• Within the mfg limits for the boiler
#2: Heating Water Loop Temperature
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• Radiant Panels
Primary Loop Secondary Loop
#2: Heating Water Loop Temperature
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• Secondary Loop control
• Reduces losses on low demand
• Allows for set points that reflect the end devices
Primary Loop Secondary Loop
#2: Heating Water Loop Temperature
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• Radiant Panels typically require
175 to 185 deg F water (79 - 85 deg C)
Primary Loop Secondary Loop
#2: Heating Water Loop Temperature
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#2: Heating Water Loop Temperature
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#2: Heating Water Loop Temperature
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#2: Heating Water Loop Temperature
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#2: Heating Water Loop Temperature
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• Loop is reset based on outdoor temperature
• Loop is running at 60 deg C (20 less than typical)
• Even primary water is too cool for radiant panels
#2: Heating Water Loop Temperature
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• Loop is reset based on outdoor temperature
• Loop is running at 60 deg C (20 less than typical)
• Even primary water is too cool for radiant panels
#2: Heating Water Loop Temperature
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• Possible solutions:
• Read manufacturers literature on acceptable
operating temperatures for your terminal units
• Set up reset schedules based on these limits
• If you have radiant panels – run them hot
#3: Duct leakage
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• Problem: conditioned air leaking out of ducts
#3: Duct leakage
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• Indicator is ceiling space or return air path cooler
than the spaces served
• Seals fail over time
• Tenant retrofits do not always complete this detail
#3: Duct leakage
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• Seems harder to justify
• Definitely harder to quantify
• Absolutely wasted energy
• Protect your energy source
• Think of your conditioned air as energy
• Night job resealing ductwork
#4: Simultaneous Heating & Cooling
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• Problem: poor sequencing
• Correct sequencing of heating & cooling is critical
• For high humidity control, enthalpy must be a
factor in your free cooling calculation
• Delays in switching off consume excess
mechanical cooling
• Delays in switching on fail to take advantage of
available free cooling
#4: Simultaneous Heating & Cooling
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• Mixed Air Temp set points
• Difficult to set correctly
• Invite operator intervention
• Require tuning
• Add a layer of complication
• Get rid of them. Sequence your mixing
dampers directly with your heating and cooling
#4: Simultaneous Heating & Cooling
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• Hot and Cold Deck setpoints
• Use zone demand to calculate
• Create “just enough” heating or cooling to
satisfy your highest demand zone
• This applies to resetting your static pressure
#5: Forgotten overrides
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• For all sorts of good reasons operators override
devices temporarily.
• Too often, when the need has passed, the
override is long forgotten.
• When it is an entire system left running the cost
can add up quickly.
#5: Forgotten overrides
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#5: Forgotten overrides
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#5: Forgotten overrides
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#5: Forgotten overrides
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#5: Forgotten overrides
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• When you have an energy monitoring system
you can see the results of what you do.
• Alerts can notify you when demand exceeds
predictions by a defined threshold.
Pulse EMS: Occupant Engagement
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Measuring and Reporting Energy Savings
Pulse EMS: Understanding Your Building
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Pulse EMS: Understanding Your Building
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Questions?
Thank you!
•Additional questions? Contact Pulse Energy
•1-877-331-0530
•http://www.pulseenergy.com/company/contact
•More energy management best practices
•On-demand webinars:
http://www.pulseenergy.com/resources/energy-
management-webinars/
•Pulse blog: http://blog.pulseenergy.com/
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