Energy Efficient Operations Presentation to ASHRAE Energy Expo October 2 2013 Center for Energy and Environment During commissioning projects the commissioning agent develops a deep understanding of the facility ID: 769318
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Energy Efficient Operations Presentation to ASHRAE Energy ExpoOctober 2, 2013 Center for Energy and Environment
During commissioning projects the commissioning agent develops a deep understanding of the facilityMechanical systemsBuilding envelopeLightingOccupant patternsThose systems that work right don’t generate recommendationsEnergy efficient operations is a part of all systemsBut, much of the knowledge is not transferred to anyone by the commissioning agent A Valuable Addition to the Building Commissioning Process
Assumes Existing Building Commissioning (EBCx) Transfer of knowledge is needed Adds value to the customerDemonstrates expertise of the commissioning agentLeads to high performing buildingsPeter Herzog has been the driving force in this field for over 40 yearsFor Existing Buildings
Understand the building structure and systems (EBCx)Analyze the operations (EBCx)Train the staff Document the results in a manualContinue the cycleEnergy Efficient Operations: The Process
80:20 ruleEnergy intensive operationsCommon types of deficiencies Needs of the operatorBased on observations during EBCx projectSystemsStaffOperationsIndividualized training
Depends on operator’s level of expertise What to check is often less important than how to check it.Remove barriers related to intermittent activitiesUtilize established training methods Repeat three times Break down into simple steps Clearly state the objective Training Module Example: Checking performance with the BAS
Using the BAS to Review Schedules Goal: On at 7AM, off at 10 PM
Based on interviews and documents in new buildingsOwners, occupants and operatorsExisting buildings (when occupied) should define OFR Building must be operating at equilibrium Agreement between owners, operators and occupantsDoes not mean it is energy efficientOccupant complaints or unstable conditions indicate non-equilibrium conditionsMay be due to equipment or design issuesTypically a focus of EBCx project Owner’s Facility Requirements
Energy efficient operations will be identified in the equilibrium operations through rigorous investigationNon-equilibrium operations will be investigated and solutions identified Commissioning agent’s scope covers bothEnergy Efficient Operations Manual is the tangible record of these findings, even after prescribed measures are implementedValue of integrating with EBCx
Manual must be comprehensiveLevel of detail depends to some degree on the operatorCheck sheets must be tailored to the operator How many things can they check, and how often?What level of detail is needed in the instructions?What is the logging system?What is done with the results?Facility size may provide a rule of thumbLarge 24x7 facility probably has a full staff with specialistsSmall 50 hr/week facility may have a part time staff, or it may be a secondary responsibility of someone else Operators will differ in competency
State of Minnesota Buildings: Most common energy saving opportunities
Description Average SavingsNumber ObservedBoiler retrofit 8.1 kbtu/sq. ft. 3 Heat recovery retrofit 3.9 kbtu/sq. ft. 5 Stuck or leaky valve 3.9 kbtu/sq. ft. 14 Time of day enabling is excessive 3.3 kbtu/sq. ft. 135 Measures with the largest impact These observations are based on 218 buildings at 49 sites containing 18.5 million square feet Average EUI (site energy use) of these buildings is 107 kbtu/sq. ft.
Why Customize? Heating Systems
Program developed for building operators to assure persistence of savings following SB2030 new construction and PBEEEP projectsSite specific Half day of hands on trainingManual and Check Sheets providedSeries of monthly webinars on general energy efficient operations management topicsAHU’s Economizers, Fans, Motors, VFD’sBuilding automation systemsHeating and cooling plants Summary: Energy Efficient Operations
Requires a relationshipProvide requested Job Instruction sheetsReminder to submit check sheets (or in PM system)Maintained in a databaseProvide long term supportMechanical engineering expertiseControls issuesGeneral energy management Sharing of new developments and best practices Energy Efficient Operations: After the Visit
Verification Check sheet Check mark under Section 41.2 if delta T is greater than 10 degrees: N o corrective action is needed.
Chris PlumCenter for Energy and Environment 612-335-5825cplum@mncee.orgThank you