Rmes load based control
Transcript of Rmes load based control
10/2/12
Load Based Control
Jeff Lucas, C.E.M
Rocky Mountain Energy Services
Ennovate Corporation
Building Automation Gone Wrong
Agenda
About RMESProduct OfferingsWhat We DoCore Beliefs and ObjectivesWhat We Do DifferentExample Load Based Controls StrategiesExample Projects
About Rocky Mountain Energy Services
• Founded in 2006• Based out of Centennial• 12 full time and 2 part time employees• More than 125 years of combined experience• Factory authorized KMC Controls dealer• Niagara Integrator
Product Offerings
KMC Controls Started in the controls business in 1955 Make building automation components including valves
and actuators Made in the USA BACnet open protocol Web services are supported All products carry 5 year warranty RMES is not the only Denver dealer
Niagara Integration Allows integration to many legacy protocols Web access to protocols other than BACnet
www.kmccontrols.com
What We Do
Building automation systems design and installation
Existing building retro-fitsProject specification and design consulting VFD installationLighting upgradesSystems integrationEnergy auditingBuilding automation system commissioningRetro-commissioning Third party M&V
Core Beliefs and Objectives
Optimization of control systems from installationFull utilization of control system dataDocument everythingAvoid system lockdown. This allows our customers
to choose to do business with usQuality before profit100% perfect start-upsCustomer service is key to our success
What We Do Different
We don’t leave until it worksFully document system checkout24/7 system monitoring free for 1 yearExtensive documentationEmployee trainingProfit sharingAttention to detailFixed markupsOpen book pricing availableWe leave our systems openPostmortem meetings
Load Based Control
Typical Boiler Control Sequence
HVACHVAC
OATOAT
Building LoadBuilding Load
IF OAT < 57 THEN START BOILER SYSTEMENDIF
IF OAT > 60 THEN STOP BOILER SYSTEMENDIF
Load Based Boiler Control Sequence
HVACHVAC
OATOAT
Building LoadBuilding Load
OAT used only as a check.
Control is based on building load. Use only what is needed.
Example Control Strategies (Boiler)
Boiler enable Enable boiler plant when average space heat PIDs > 20% OAT < 50º
Boiler supply reset (example condensing boiler) VAV heat PID loop reset schedule (0% = 90º , 100% = 180º) ∆ T reset schedule (design min ∆ T = 90º , max ∆ T = 180º) OAT reset schedule ( 60º OAT = 90º , 10º OAT = 180º) Average all three resets for final setpoint
Disable boiler plant when building is unoccupied and OAT > 37º Continue running pumps for 30 min after shutdown Predictive weather data
Example Control Strategies (Chiller)
Chiller enable Enable chiller plant when average space cooling PIDs > 20% Average economizer position > 85% for 30 minutes OAT > 57º
Chilled water supply reset VAV cooling PID loop reset schedule (0% = 52º ,100% = 42º) Average CHWV position reset schedule(0% = 52º ,100% = 42º) OAT reset schedule ( 57º OAT = 52º , 90º OAT = 42º) Average all three resets for final setpoint
Condenser water reset Condenser water pump speed Flatplate HX changeover Real time KW per ton
Example Chiller Control Strategies
Chiller staging
Example Control Strategies (AHU RTU)
Supply air reset VAV cooling PID loop reset schedule (0% = 67º , 100% = 55º)
Duct static reset VAV damper position VAV CFM setpoint error
Economizer modulates to maintain supply air reset + fan gain Economizer enabled if OAT < RAT Never allow simultaneous heating and cooling
HWV controls to SAT SP – 3º When unoccupied modulate hot water valve to maintain 42º
mixed air temperature Control return fan off pressure Demand based ventilation Morning warm-up, optimum start/stop
Example Control Strategies (VAV)
Allow occupant adjustment limited to 4º Close re-heat valve when unoccupied and OAT > 37º Open re-heat valve 30% when unoccupied and OAT < 35º Schedule VAVs in zones and close when possible
Example Control Strategies (Demand Limiting)
#1 Goal is to have a low impact on occupant comfort Shed loads in stages based on a PID Setpoint changes monthly based on baseline First step shed non-necessary equipment like exhaust fans Second step slow down fans Third step slow pumps Fourth step begin shedding cooling loads Fifth step begin turning off fans
How Much Energy Will Be Saved?
6 projects saw a 20%-32% savings programming only
4 projects saw a 27%-47% saving with VFD retrofits
Example Projects
Lockheed Martin Deer Creek– A partial energy audit was performed on this building in 2010.
The building is 750,000 sq ft. Rocky Mountain Energy Services implemented several energy saving measures. Details of this project are confidential. 4.75 month payback on
$150,000 Elizabeth High School
– A full energy audit was performed on this school in 2008. Several energy saving opportunities were identified. Rocky Mountain Energy Services implemented several energy saving measures. 4 month payback. Energy use down 32%
Example Projects (full DDC Conversions)
6860 Yosemite Street– A full energy audit was performed on this building in 2010.
Rocky Mountain Energy Services determined that a new DDC system needed to be installed. The system was installed, programmed and commissioned by Rocky Mountain Energy Services. Customer is on target to realize a 2.75 year ROI.
Singing Hills Elementary– A full energy audit was performed on this school in 2009.
Rocky Mountain Energy Services determined that a new DDC system needed to be installed. The system was installed, programmed and commissioned by Rocky Mountain Energy
Services. Customer is on target to realize a 3.4 year ROI.
Installation Pictures
Training
Warehouse
Control Panel Building
Example AHU Graphic
Example Floor Plan Graphic
Questions?
Thank You!