Prism Engineering - This version of the presentation includes the … · 2018. 5. 3. · 1 •This...
Transcript of Prism Engineering - This version of the presentation includes the … · 2018. 5. 3. · 1 •This...
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• This version of the presentation includes the theory portion of the session. Examples from Prism projects and clients are not included. For further information or details, please contact the presentor
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SPONSOR: Heather Scholefield, Program Manager Commercial Marketing Reid Arkinstall , Marketing Specialist, Conservation and Energy Management
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Prism Engineering provides consulting services to address technical, behavioral and organizational aspects of Energy Management We design and implement cost effective approaches to address comfort, efficiency and reliability.
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• Schedules
• Setpoints
• Sequences
• O&M Practices
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Item Measure 1 Reduce Equipment Runtime
2 Optimize Economizer Operation
3 Eliminate Simultaneous Heating and Cooling
4 Optimize Supply Air Temperature
5 Optimize Zone Temperature Setpoints
6 Eliminate Unnecessary Lighting Hours
7 Optimize Ventilation Rates
8 Volume Control for Pumps and Fans
9 Add / Improve Chilled Water Temperature Reset
10 Eliminate Passing (leaky) Valves
Schedules
Sequences
Sequences
Sequences
Sequences
Setpoints
Setpoints
Setpoints
O&M
Schedules
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• Real examples from Prism Engineering energy audits, COp, Energy Manager roles and DDC optimization contracts
• Practical scenarios that can be applied to your buildings
• Sectors include MURBs, education, health care, municipalities, offices, retail/hospitality
• 50 screen shots from a wide variety of DDC system providers
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• Weekly Schedules
• Occupancy Feedback
• Exception Schedules
–Holidays
–After Hours Use
–Special Events (ie Voting Day)
• Optimal Start
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• Optimal start/stop setback / setup
– In heating mode: Bring systems on earlier on colder days when needed and later on warmer days
–Can amount to 3% of heating energy savings
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1. Align system schedule with occupancy
2. Ensure target temperature setpoint aligns with room temperature setpoint
3. Set reasonable maximum start limits
School
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• Maintain Energy Efficient Space Temperatures with a deadband
– Heat to 21C
– Cool to 24C
– Revise based on particular space needs
• Maintain Humidity and Pressure
– Meet requirements of space
Overheating or overcooling of spaces results in higher ventilation loads and thermal losses
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• Reset Temperatures (Water and Air)
• Outside and mixed air damper controls
• Simultaneous Heating and Cooling
• Shut down pumps
• Static Pressure Reset
• Zone Isolation
• Optimize VAV Operation
• Demand Control Ventilation
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• Full recirculation mode for warm up / set back period
– Reduce outside air that needs to be heated when there are no occupants
• Automatic supply temperature reset on demand
– Varying reset with season & occupancy
– Avoids unnecessary reheating during spring & fall
– Typical savings of 3% of heating energy required
• Reset of heating water temperature on OAT
– Applies to heating water systems (boilers) and radiation systems
– Reduces overheating
– Can reduce boiler standby if boiler water temperature is also reduced
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Proper operation of mixing dampers
–Bring in only as much outside air as is needed
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• Air handling systems are designed to provide adequate fresh air to meet code and guidelines (ASHRAE 62.1)
• Minimum damper setting should be sufficient to provide these ventilation requirements
• Install CO2 transmitters and provide feedback to modulate outside air damper
• Under periods of low occupancy, reduce outside air rate
• Works best for spaces with variable occupancy (gymnasiums, auditoriums, etc.)
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• Warm weather shut down:
– Typical standby losses: 5-6% of rated input if boiler is pumped continuously
– 1MBH boiler on hot standby: 60,000 BTU/h of losses
• Multiple Boiler sequencing
• Run boiler pumps only when boiler is firing
• Optimize Condensing
• Ensure heat recovery is recovering heat!
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• Reduce compressor cycling
• Optimize multiple chiller sequence
• Optimize the condenser loop
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• Calibrate / commission sensors
– Temperature
– Pressure
– CO2
– Flow
• Identify / repair broken dampers
• Identify / repair passing valves
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• A management system is needed to establish: Who does what and when?
• Need to track activities. Log books?
• Engage DDC operators, maintenance staff, planning (work orders?) and the relationship between these parties
• Caution: do not make any changes without considering impact on codes
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• Graph shows natural gas savings but there are lower runtime hours for the 50 HP fan so electrical savings as well.
• DDC changes made:
– Monday start up time was 02:30h which we moved to 06:30h.
– T-F weekday start up time for the building was at 04:30h on weekdays - we moved it 06:30h.
– There was a schedule to heat the building for the occasional weekend. We changed that schedule from 8-16:00h Sat and Sunday to 9-12:00h
1000 GJ savings in last 12 months
Municipal Hall
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• two of our most energy intensive buildings at UNBC
• combination of scheduling changes to more closely match occupancy times (lighting, air exchange, temperature), and staged pump control.
• As lab buildings, they have significantly greater energy consumption needs.
• DDC is the place to start for scheduling automated building controls.
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• Schedules – Align Equipment Operating Schedules with Occupancy
– Use Holiday and exception scheduling effectively
• Setpoints – Ensure Temperature Setback/Setup during Unoccupied periods
– Put in place optimal temperature and pressure setpoints
– Ensure that all outside ambient lock outs have correct set points
• Sequences – Use air and water reset schedules
– Ensure that all heating and cooling pumps are shut down when not needed
– Reduce or eliminate simultaneous heating and cooling
– Temperature and ventilation reset on demand
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• O&M practices – Ensure that outside air sensors are calibrated and reading correctly. An
outside air sensor is used in various programs for scheduling.
– Ensure proper operation of dampers and valves
– Ensure proper outside air quantities
• Process and Procedures – Need management process for optimizing DDC
– WHO needs to do WHAT and WHEN
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Robert Greenwald, P.Eng., MBA, President
@Rob_Prism
Tel: 604-205-5500
www.prismengineering.com
320 - 3605 Gilmore Way, Burnaby, BC V5G 4X5