James Smith, Pulse Energy’s Building Automation System (BAS) expert, presented this informative webinar on how you can identify and fix five common sources of energy waste in Heating, Ventilating, and Air Conditioning (HVAC) systems. James is a factory trained controls technician with over 18 years of hands-on experience installing and servicing HVAC automation systems for Siemens Building Technologies and Johnson Controls in office towers, universities and hospitals. During the webinar he: - presented five common sources of energy waste in these important building systems - shared ways to address them to lower energy costs, improve building performance and occupant comfort

1. Pulse Energy Webinar:
5 Common Energy
Wasters in HVAC Systems
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2. 3 Things You Want to Know About This Presentation
• 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
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3. Agenda
• 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
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4. Intro: James Smith
• 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
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5. #1: Pairing Pneumatic & Electronic Control
• Problem: DDC computer may not accurately
reflect the device position in the field
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6. #1: Pairing Pneumatic & Electronic Control
• Problem: DDC computer may not accurately
reflect device position in the field
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7. #1: Pairing Pneumatic & Electronic Control
• Problem: DDC computer may not accurately
reflect device position in the field
0 – 5 VDC
0 – 100% Open
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8. #1: Pairing Pneumatic & Electronic Control
• Problem: DDC computer may not accurately
reflect device position in the field
0 – 5 VDC
0 – 100% Open
• Reliable
• Repeatable
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9. #1: Pairing Pneumatic & Electronic Control
• Problem: DDC computer may not accurately
reflect device position in the field
0 – 100% Open
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10. #1: Pairing Pneumatic & Electronic Control
• Large stock of pneumatic devices
0 – 100% Open
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11. #1: Pairing Pneumatic & Electronic Control
• Problem: DDC computer may not accurately
reflect device position in the field
0 – 5 VDC
0 – 20 PSI
0 – 100% Open
3 – 8 PSI
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12. #1: Pairing Pneumatic & Electronic Control
• Problem: DDC computer may not accurately
reflect device position in the field
0 – 5 VDC
4 – 9 PSI
0 – 100% Open
3 – 8 PSI
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13. #1: Pairing Pneumatic & Electronic Control
• Problem: DDC computer may not accurately
reflect device position in the field
0 – 5 VDC
4 – 9 PSI
0 – 100% Open
3 – 8 PSI
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14. #1: Pairing Pneumatic & Electronic Control
• Problem: DDC computer may not accurately
reflect device position in the field
0 – 5 VDC
0 – 20 PSI
0 – 100% Open
3 – 8 PSI
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15. #1: Pairing Pneumatic & Electronic Control
• Problem: DDC computer may not accurately
reflect device position in the field
0 – 5 VDC
0 – 20 PSI
0 – 100% Open
4 – 9 PSI
3 – 8 PSI 20 PSI
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16. #1: Pairing Pneumatic & Electronic Control
• One way to identify this problem: look for
unbelievable temperatures
0 – 5 VDC
0 – 20 PSI
0 – 100% Open
4 – 9 PSI
3 – 8 PSI 20 PSI
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17. #1: Pairing Pneumatic & Electronic Control
• Possible solutions:
• schedule both trades to work together
• cross train
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18. #2: Heating Water Loop Temperature
• Problem: inappropriate water temperatures for
terminal units
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19. #2: Heating Water Loop Temperature
• Most Boilers
• Consider manufacturers limits
• Consider terminal units
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20. #2: Heating Water Loop Temperature
• Local set point
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21. #2: Heating Water Loop Temperature
• Reset based on external variable
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22. #2: Heating Water Loop Temperature
• Reset based on external variable
• Possible to use Valve positions
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23. #2: Heating Water Loop Temperature
• Within the mfg limits for the boiler
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24. #2: Heating Water Loop Temperature
Primary Loop Secondary Loop
• Radiant Panels
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25. #2: Heating Water Loop Temperature
Primary Loop Secondary Loop
• Secondary Loop control
• Reduces losses on low demand
• Allows for set points that reflect the end devices
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26. #2: Heating Water Loop Temperature
Primary Loop Secondary Loop
• Radiant Panels typically require
175 to 185 deg F water (79 - 85 deg C)
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27. #2: Heating Water Loop Temperature
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28. #2: Heating Water Loop Temperature
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29. #2: Heating Water Loop Temperature
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30. #2: Heating Water Loop Temperature
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31. #2: Heating Water Loop Temperature
• 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
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32. #2: Heating Water Loop Temperature
• 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
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33. #2: Heating Water Loop Temperature
• 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
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34. #3: Duct leakage
• Problem: conditioned air leaking out of ducts
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35. #3: Duct leakage
• 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
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36. #3: Duct leakage
• 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
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37. #4: Simultaneous Heating & Cooling
• 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
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38. #4: Simultaneous Heating & Cooling
• 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
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39. #4: Simultaneous Heating & Cooling
• 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
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40. #5: Forgotten overrides
• 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.
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41. #5: Forgotten overrides
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42. #5: Forgotten overrides
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43. #5: Forgotten overrides
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44. #5: Forgotten overrides
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45. #5: Forgotten overrides
• 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.
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46. Pulse EMS: Occupant Engagement
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47. Measuring and Reporting Energy Savings

48. Pulse EMS: Understanding Your Building
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49. Pulse EMS: Understanding Your Building
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50. Questions?
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51. Thank you!
•Additional questions? Contact Pulse Energy
•1-877-331-0530
•info@pulseenergy.com
•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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