Download pdf - 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


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reflect device position in the field


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0 – 100% Open

0 – 5 VDC


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0 – 100% Open

0 – 5 VDC

• Reliable

• Repeatable


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0 – 100% Open


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• Large stock of pneumatic devices

0 – 100% Open


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0 – 100% Open

0 – 5 VDC

0 – 20 PSI

3 – 8 PSI


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0 – 100% Open

0 – 5 VDC

4 – 9 PSI

3 – 8 PSI


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0 – 100% Open

0 – 5 VDC

4 – 9 PSI

3 – 8 PSI


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0 – 100% Open

0 – 5 VDC

0 – 20 PSI

3 – 8 PSI


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0 – 100% Open

0 – 5 VDC

0 – 20 PSI

3 – 8 PSI4 – 9 PSI

20 PSI


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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


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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


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• Most Boilers

• Consider manufacturers limits

• Consider terminal units


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• Local set point


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• Reset based on external variable


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• Reset based on external variable

• Possible to use Valve positions


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• Within the mfg limits for the boiler


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• Radiant Panels

Primary Loop Secondary Loop


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• Secondary Loop control

• Reduces losses on low demand

• Allows for set points that reflect the end devices



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• Radiant Panels typically require

175 to 185 deg F water (79 - 85 deg C)



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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


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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


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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


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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


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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.


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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

•[email protected]

•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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mailto:[email protected]

http://www.pulseenergy.com/company/contact

http://www.pulseenergy.com/resources/energy-management-webinars/





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