Phoenix Convention Center Phoenix, Arizona Facility Energy Audits Mike Gutowski Johnson Controls August 12, 2015 Agency Energy ManagerEnergy Audits: Implementing

Phoenix Convention Center • Phoenix, Arizona

Facility Energy AuditsMike Gutowski

Johnson ControlsAugust 12, 2015

Agency Energy Manager Energy Audits: Implementing Audits and Turning Audits into Projects

Energy Exchange: Federal Sustainability for the Next Decade2

Agenda

• Concept of Energy Audit• Overview of ASHRAE Approach• Before you get into the buildings• The “Walk Thru”• Compiling everything into something

meaningful• ECMs/EEMs/FIMs• What next?


• Why am I being asked to audit these buildings?– Inventory/Assessment– Capital projects list– Certification of some kind– My boss is making me do this– Goals– Part of an established contracting vehicle

The Energy Audit


• Fundamental results of an energy audit– Establishing current usage, or baseline– Allocating current usage to different functions– Comparison of results to similar facilities in similar climate

areas– Identification (and possibly implementation) of Energy

Conservation Measures (ECMs)– Short version – establish where, when,why, and how, and then the best way to implement based on client goals

The Energy Audit


Level 1 Audit - Walk-Through Analysis/Preliminary Audit

Level 2 Audit - Energy Survey and Analysis

Level 3 Audit - Detailed Analysis of Capital Intensive

Modifications

- Level of detail adequate to prioritize energy efficiency projects

- Walk thru of facility- Typically uncovers major or

“glaring” problem areas- High level review of utility

data- Findings compiled to a

report showing low cost/no cost measures, and those which should be studied further

- Next level of energy calculations and financial analysis of proposed measures

- 2-3 years of monthly utility analysis, establishing rate structure

- Presentation of measures by cost and savings, recommendations and prioritization

- M&V support (measurement & verification)

- Focus on capital intensive projects

- Further detail in field analysis

- Design drawings, specifications to support decisions

- Calibrated building models and calculations to support findings

Overview of ASHRAE Methodology


• “Procedures for Commercial Building Energy Audits”

• Audit sheets included

ASHRAE Documents


• Energy use data– Utility bills– Spreadsheets– Annual or monthly

• Electricity and fossil fuels compose Energy Use Intensity (EUI)– kBtu/sf/yr

• Compare to similar buildings in similar geographies• CBECS (Commercial Energy Building Consumption

Survey)• Energy Star

Before Going Onsite


• Commercial Buildings Energy Consumption Survey– 2003 was last

complete effort– 2007 data not

“valid statistical sets”

– 2012 results now being released

CBECS


• Census Regions (Apples to Apples)

CBECS - Continued


• Uses CBECS Data!

Energy Star Portfolio Manager


• Prioritize buildings– Function– Outliers– Customer requests

• General understanding of systems• Heating/Cooling

– Controls– Schedules– What’s broken

• Decent plan of attack– Have the right team

Before going onsite - continued


• SAFETY– Protective gear– Fall protection– Ladder safety– Space awareness– Bump cap/hardhat

The Walk Thru


The Walk Thru

• Not the most promising first impressions…..


• Arrival onsite– Escort– Finding “the guy”– Quick “sit down”

• Document as much as possible with photos– Plans– Nameplates– Model numbers

• Building walk-around– Envelope– Irrigation

• Mechanical rooms– HVAC airside/waterside

The Walk Thru - Continued


• Central plant(s)– Front end workstation– Find the operator

• Pipe and insulation• Steam traps• Plug loads

The Walk Thru - Continued


• Photos, notes, measurements• Suggested practices picked up over the years– Title photos as soon as possible (ie CH-2, B-1)– Rewrite notes in Word– Tabulate data in Excel– Group as much as possible by building– Going back through your items will trigger more

thoughts• Correlate utility data to what you saw in the

buildings– Calibration to end uses (HVAC, Lighting, Plug Load etc.)

Compiling / Analyzing Data


Compiling / Analyzing Data Continued

• Important to understand how a building is operating

• Adjust level of detail based on final deliverable

• Basic principle – the closer your model is to the utility data, the more confident you can be in your savings potential


Measure Energy Type(s)

Units Saved

$/Year Saved Install Cost Simple

PaybackCost of O&M

Cost of M&V

Adjusted Simple

Payback

Hi Bay Lighting kWh 2,300,000 $149,500 $1,196,000 8.0 $ 27,000 $ 9,500 8.2

VFDs on AHU Fans kWh/therm 450,000 $ 29,250 $ 204,750 7.0 $ 18,000 $12,500 8.0

Boiler Controls MMBtu 27,500 $ 16,500 $ 165,000 10.0 $ 12,000 $ 9,500 11.3

New Water Cooled Chiller

kWh 1,500,000 $ 97,500 $1,950,000 20.0 $ 167,000 $45,000 22.2

Night Setback in

OfficeskWh/Therm 400,000 $240,000 $ 480,000 2.0 $ 7,000 $12,500 2.1

ECM Identification


• Reviewing results with your client– Clarify goals– Prioritize projects• Metric specific• Building specific• Deferred capital projects

• Funding streams that can support the ECMs– Operational savings– Avoided cost of capital– One time planned budget items

What Now?


• Questions? Thank You!

Wrap Up