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Advanced RTU Campaign
Technical Resources: Evaluating PerformanceDecember 10, 2013
Agenda
Overview of the Advanced RTU Campaign
Resources for RTU Evaluation
RTU Evaluation Application
RTU Upgrade Case Study
Better Buildings Alliance1
Overview of the Advanced RTU Campaign
Marta Milan, Waypoint Buildings Group
Better Buildings Alliance2
Advanced RTU Campaign (ARC) Overview
National campaign for promotion and support of high-efficiency RTU replacements and retrofits
Partnership between DOE, ASHRAE, RILA, and several supporting organizations
Launched May 30, 2013 and runs through November 2014
Eligible Technologies
High-Efficiency Replacements– For units > 10 years old– CEE Tier 2 and above
Advanced Control Retrofits– For units < 10 years old and > 7 tons– Primarily add variable speed fan control
Better Buildings Alliance3
www.advancedrtu.org
Benefits of Joining ARC
• Business opportunity – gain credibility from the experiences of a national
campaign
• Leverage DOE technical resources in evaluating savings opportunities
• Qualify for discounts from supporters, including on ASHRAE technical guides
• Stay informed on innovative RTU technologies and resources produced
through the campaign
• Gain recognition, achievement awards, and participate in case studies
based on energy savings
• Save energy and money – Older RTUs can waste from $1,000 to $3,700 per
unit annually, depending on the building size and type
4
Resources for RTU Evaluation
Michael Deru, National Renewable Energy Laboratory
Better Buildings Alliance5
Decision Tree for Evaluating RTUs
Better Buildings Alliance6
Questions
to guide
evaluation Resources
RTU Evaluation Process
1. Initial RTU Inventory: gather basic information in the RTU Inventory Spreadsheet
2. Preliminary Screening: Bin RTUs: retrofit, replacement, needs further analysis, or no action
3. Detailed Inventory: Gather additional information in the RTU Inventory Spreadsheet
4. Field Evaluation: Visual-based field evaluation using the RTU Field Evaluation Checklist
5. Analysis: Energy and economic analyses to make the business case and prioritize actions.
RTU Incentives Database, RTU Comparison Calculator, 179D DOE Calculator, RTU Sizing
Guidance, and ARC Case Studies.
6. Project Planning: Develop a plan for replacements and retrofits. See the list of ARC
Supporting Partners for manufacturers and service providers.
7. Procurement: Prepare a procurement specification(s) with quality installation and quality
maintenance requirements see Procurement Specifications for guidance.
8. Measurement and Verification (M&V): Use the M&V Guidance to determine the appropriate
level of M&V for the project and develop and M&V plan.
Better Buildings Alliance7
RTU Inventory Spreadsheet
Combines Preliminary
Screening, Detailed Inventory,
and results of Field Evaluation
Meant to be a starting point –
modify to fit your needs
Better Buildings Alliance8
Preliminary Screening
Better Buildings Alliance9
Gather data from site visit, drawings, asset inventory, etc. May not need all of the fields.
Access general condition and place RTUs into Bins – Replace, Retrofit, Needs Further
Evaluation, No Action
Preliminary Screening Example
Better Buildings Alliance10
Detailed Inventory and Field Evaluation
Better Buildings Alliance11
RTU Field Evaluation Checklist
Better Buildings Alliance12
Visual based inspection,
no measurements required
Need to be familiar with RTUs
but not a trained technician
RTU Field Evaluation Checklist
Better Buildings Alliance13
Analysis Resources
RTU Incentives Database, DSIRE,
RTU Comparison Calculator
www.pnnl.gov/uac/
179D DOE Calculatorhttp://apps1.eere.energy.gov/buildings/commercial/179d
Case Studieshttp://www.advancedrtu.org/case-studies--guidance.html
Better Buildings Alliance14
Planning and Procurement
Project Planning
– This is where you save money
– Avoid costly emergency replacements
– Optimize long-term energy, maintenance, and economic performance
Procurement
– Short and long specifications are coming soon
– Integrate Quality Installation and Quality Maintenance programs• ANSI/ACCA 5 QI – 2010, HVAC Quality Installation Specification
• ANSI/ASHRAE/ACCA Standard 180-2012, Standard Practice for Inspection and Maintenance of Commercial
Building HVAC Systems
Better Buildings Alliance15
Project Measurement and Verification
Do you need M&V?
– Do you need to determine the project
savings or justify future projects?
What accuracy do you need and how much are
you willing to spend?
– guidance document to help determine the
best approach
Better Buildings Alliance16
RTU Evaluation Application
Bill Reynolds, Benchmark Group
Better Buildings Alliance17
Why Establish a Commercial Building Program
1. 51% of RTUs are over ten years old and are nearing the end of their useful age.
2. The majority of RTUs are poorly maintained.
3. There is a lack of control strategies with operating schedules that cause unnecessary
operation.
4. Multitude of problems : 91% had one Problem & 41% had two or more
Source: nbi
Better Buildings Alliance18
new building
institute
Opportunities for RTU Energy Improvements
1. Retro Commissioning - maintenance, re-establish a baseline
2. Retro Fits – Controls, drives, heat recovery, staging of compressors
3. Replacements – More efficient units, resizing
Better Buildings Alliance19
Implement a Process
1. Prioritize the buildings to be audited based on age and maintenance records
2. Conduct a RTU survey – condition, age
3. Units that are 10 years and older should be evaluated for replacement
4. Units less than 10 years olds are candidates for retro fits or Retro-Commissioning
5. Provide an Energy Saving Analysis for Return on Investment
6. Based upon the surveys and analysis, schedule the required services to update the systems.
Better Buildings Alliance20
RTU Upgrade Case Study
JCPenney Store 2921, Flower Mound, Texasand subsequent 126-store rollout including approximately 1300 rooftop units
Better Buildings Alliance21
Ken Logsdon, NexRev
Pat Trlica, NexRev
VFD Retrofits as RTU Efficiency Upgrade
Better Buildings Alliance22
Most commercial rooftop HVAC units are equipped
with multiple stages of cooling and heating.
In most cases, those units only operate at full-load
conditions less than 5% of the time.
However, the blower fans can only run at full-speed
…. regardless of the “stage” of unit operation.
Retrofitting those unit blower fans with VFD’s
represents a significant energy-saving opportunity.
Utilize Variable Frequency Drives (VFDs) to
convert RTU blower fan operation from constant
speed to multiple speeds that more closely
match the actual load as indicated by the
thermostat or control system “calls” to the unit.
VFD Retrofits as RTU Efficiency Upgrade
the Concept
Why do this?
#1 reason = Save Energy
Fan Motor @ 80% Speed uses 47% less power
Fan Motor @ 60% Speed uses 78% less power
VFD Retrofits as RTU Efficiency Upgrade
90%
80%
70%
60%
50%
100%
40%
30%
20%
10%
100%
6.6%
75.2%
52.8%
35.4%
22.3%
0%
12.9%
90%
80%
70%
60%
50%
100%
Speed
Power
The Fan Affinity Law with regard to Power
Better Buildings Alliance26
Case Study: Flower Mound, TX
Background:
JCPenney was actively seeking energy efficiency initiatives
Evaluated retrofit product offerings and vendors
Selected by for pilot store
Case Study: Flower Mound, TX
Better Buildings Alliance27
• Typical Prototype
• Built in 2006
• 100,000 square feet
• 12 RTUs: 2-stg Cool, 1-stg Heat
o Ten (10) 25 ton / 7.5 hp blower
o One (1) 15 ton / 5 hp blowero One (1) 10 ton / 3 hp blower
JCP Store 2921…
60,000
80,000
100,000
120,000
140,000
160,000
180,000
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov
2009 kWh 2010 kWh 2011 kWh
En
tire
Sto
re k
Wh
17%
16%
11%9%
18%
19%
22%
17%
15%16%
16%
Better Buildings Alliance28
Savings = 16%
2011 kWh consumption vs. 2009/2010 Average
VFD Retrofit on January 3, 2011
Case Study: Flower Mound, TX
Better Buildings Alliance29
Case Study: Flower Mound, TX
Simple Payback… Estimated = 1.57 yrs Actual = 0.66 yrs (8 mos)
Better Buildings Alliance30
Case Study: Flower Mound, TX
10 point improvement from 65 to 75 in December = Energy Star Certified!
Better Buildings Alliance31
DrivePak™ Rollout Project
Rollout:
Installation of began in June 2011
Based on pilot store results, rollout schedule was accelerated
Contract awarded to for 126 stores
Project completed in September, approx 1300 units in all
Annualized project results: 12.9% kWh reduction
$2,628,000 avoided cost
Contacts
Advanced RTU Campaign: www.advancedrtu.org
Michael Deru, 303-384-7503 [email protected]
Marta Milan, 231-598-2332 [email protected]
Benchmark Group:
Bill Reynolds, 479-636-5004 [email protected]
NexRev:
Ken Logsdon, 972-303-8502 [email protected]
Pat Trlica, 405-340-1622 [email protected]
JC Penney:
David D. Sergeant, 972.431.1865 [email protected]
Better Buildings Alliance32