assess target deliver measure understanding building energy audits joe hofstetter p.e., cem, leed ap...
TRANSCRIPT
ASSESSTARGETDELIVER
MEASURE
Understanding Building Energy Audits
Joe Hofstetter P.E., CEM, LEED APKarpinski Engineering
Terms
• ASHRAE – American Society of Heating Refrigeration and Air-Conditioning Engineers
• AEE – Association of Energy Engineers• PEA – Preliminary Energy-use Analysis• ENERGY AUDIT/ASSESSMENT – An overall study of building
operation, energy end-use, and energy consuming equipment over a specified period of time.
• ECM – Energy Conservation Measure• IPMVP – International Performance Measurement and
Verification Protocol• RETRO-COMMISSIONING (RCx) – Capturing an existing
building’s owners requirements, and putting a plan in place to identify, resolve and document that these requirements are being met
Getting Prepared
Selecting the Right Tool
Length of Time
Level of Detail
Reason for Audit
What questions do you need to be prepared to
answer?
Types of Audits
LEVEL IIILEVEL IILEVEL IACCURACY
COST
Audit Process
Conduct PEA
Conduct Initial Walk through
Initial onsite interviews
LEVEL IIILEVEL IILEVEL I
Audit Results
Identify straight forward or low cost recommendations
Identify capital improvement needs
Provide order of magnitude potentials based on benchmarking and targeting
LEVEL IIILEVEL IILEVEL I
Audit Results
Preliminary Scopes of work with Cost Estimates
Detailed energy calculations for specific ECMs
Listing of improvement measures with payback
Audit Process
Review building documents and conduct detailed interviews with facilities
Measure key parameters
Detailed interviews with facilities and Analyze capital/O&M budgets
LEVEL IIILEVEL IILEVEL I
Audit Results
More detailed scopes of work
Total building energy modeling (impact of multiple ECMs working together)
Schematic layouts for recommendations
Audit Process
Energy Model simulations
Extended time equipment monitoring / data logging
Refined analysis
Preliminary Energy-Use Analysis
Preliminary Energy-Use Analysis
Combined Fuel End-Use Breakdown
Field Work and Measurement Tools
• Thermography testing• Basic level equipment testing
and balancing• Measurement tools for trending
Modeling
The interaction between
improvement measures can have a significant impact
on the overall building
performance
Types of Improvements
• Lighting upgrades
• Building management systems
• System controls
• Water conservation measures
• Chiller and boiler optimization upgrades
• Renewable energy
• Building envelope Improvements
• Site engagement programs
• GHG reduction planning
• Master energy planning
• Fans, air distribution and A/C
• Central plants
• Computer power management
• Fire & safety systems
• LEED certification
• Electrical demand response
• Electrical load shedding
Average Cost of Auditing
• Level 1 Audit = Free to $0.05 / Square Foot
• Level 2 Audit = $0.10-$0.15 / Square Foot
• Level 3 Audit =$0.25-$0.50 / Square Foot
As a rule of thumb, typical auditing services should not exceed approximately 10% of the total annual energy spend
ECM Sheet
Life Cycle Analysis
Setting Up for Success
• What’s our payback?• How fast do we want to
implement?• What other factors can be
considered that ECMs may impact both positive and negative?
• How will the project be funded?
• Will the implementation of these services interrupt the flow of business?
• Do I need my savings to be guaranteed?
• How do I explain “savings” when my utility bill goes up?
TARGET
DELIVER
MEASURE
QUESTIONS?