hvac duct and air leakage testing for commercial and industrial applications
TRANSCRIPT
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The Role of New Coil Restoration Technology in TAB and Retro-
Commissioning
Jeff Seippel, president of GreenAir Environmental
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NEBB Conference Agenda
• Company overview • GreenAir® HVAC coil cleaning and
restoration process • GreenAir® case studies • Bio-Film Problem • Environmentally Friendly Microorganisms
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GreenAir® Environmental Services • Established in 2006 as extension of HVAC restoration
and duct cleaning business – Certified Air Systems Cleaning Specialists (NADCA)
• Through restoration experience, developed proprietary and environmentally safe HVAC coil cleaning and verification process – Returns industrial and commercial HVAC coils to “like new” condition
• Scalable, national operation handling more than 30+ major-loss restoration projects
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Where We Can Help • TAB in major renovation projects • Retro-Commissioning • Implementation of Energy Audit
Recommendations
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GreenAir® Coil Cleaning Method
• Wet steam used to penetrate coil matrix and soften binding agents
Step One
• Non-corrosive cleaning agent added to wet steam
• pH balanced and environmentally safe
Step Two
• Proprietary cleaning techniques are used to ensure complete restoration
Step Three
• Tracking and measurement of psychometric data is used to verify cleaning
Step Four
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GreenAir® Coil Cleaning Video
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Measurement and Verification Process
• University of Michigan College of Engineering
• U.S. Department of Energy
• National Institute of Standards and Technology
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Equipment Specifications
HVAC System Seven, 30-ton refrigerant-based units
Filtration 2 inch pleated media pre-filter Coil Type Low-density two rows of coil approximately two inches thick. Coil Condition
Heavily soiled and damaged by standard coil cleaning method
• Canton High School • September 2009 • HVAC contractor hired to correct
air balance issue; tried standard coil cleaning method – two times; no success
• Applied GreenAir method • Air balance corrected and validated using
3rd party resource
HVAC Energy Case Study
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Canton High School Results
AHU1 AHU2 AHU3 AHU4 AHU5 AHU6 AHU7 Avg.
Before cleaning 1.20 .93 .85 1.07 .89 1.32 1.15 1.05
After cleaning .25 .17 .18 .21 .17 .20 .19 .19
Average pressure differential of coil was reduced 80%
Average CFM was increased by 40%
Pressure differential inches/wc
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• Two, 11-story towers with common first floor
• Commercial office space
Equipment Specifications HVAC System Four AHU and four chillers in penthouse Filtration
2 inch pleated media pre-filter followed by standard bag filters
Coil Type Each unit has two 10 ft. x 8 ft. coils. High-density six row coil approximately 10 inches thick.
Coil Condition
Excellent maintenance of unit with regular filter changes. Very little visible build-up on coil surface.
Ford Land
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Relative Humidity +15%
Temperature +19%
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Average Air Velocity
Average Air Velocity
Average Air Velocity Reduced 60 %
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Cooling Coil
Chiller
Cooling Tower
Cooling Tower Circuit
Chilled Water Circuit
Supply Air Return Air
Pre-Cleaning Chiller Water Temperature • Output to coils
was 44° • Return from
coils was 54-56 °
• Water temperature was raised 10-12 °
Post-Cleaning Chiller Water Temperature • Output to
coils was 44° • Return from
coils was 58-59°
• Water temperature was raised 14-15 °
HVAC Coil Cleaning Process Resulted in an Efficiency Gain of 20 – 40%
Ford Land – Chiller System
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Ford Land Chiller System Energy Usage Data
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Chillers Return Fan Drives Supply Fan Drives Circulation Pumps 1 chiller uses 216 kWh
1 drive uses 30 kWh 1 drive uses 73 kWh 1 pump uses 13 kWh
x 4 chillers x 8 drives x 4 drives x 8 pumps 865 kWh 239 kWh 293 kWh 106 kWh x 12 hours of operations
x 12 hours of operations
x 12 hours of operations
x 12 hours of operations
10,375 kWh per day 2,872 kWh per day 3,512 kWh per day 1,277 kWh per day
Daily System Energy Usage 18,036 kWh Daily Cost @ $0.07 per kWh $1,263 Annual Cost (Based on approx. 150 days of operation from May to Sept.)
$189,380
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Example of Return on Investment for Ford Land
Annual System Cost $189,380
Coil efficiency gain 20 – 40%
Percent of Energy Savings Annual Financial Savings
10% $18,938
15% $28,407
20% $37,876
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Marcus Garvey Academy
AHU Pre-Clean Velocity
Avg (ft/min) Post-Clean Velocity
Avg (ft/min) % Increase
1 217 664 206 2 197 715 262 3 178 767 331 4 38 761 1926 5 77 748 876 6 231 884 282 7 4 331 7476 8 578 670 16 9 646 667 4
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Coleman A. Young Municipal Center
Unit Pre-Clean Velocity
Avg (ft/min) Post-Clean Velocity
Avg (ft/min) % Increase
1 466 627 47 2 551 603 9 3 568 627 11 4 553 589 7 5 495 699 41 6 458 548 18 7 425 600 41 8 see AHU 8 details 570 see AHU 8 details 9 381 434 13
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Today’s HVAC Cleaning Methods are Unproven and Unreliable
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Today`s standard methods only reach into the first row of the coil structure leaving the inner majority un-affected by
the cleaning process
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Biofilm Challenge
• Bacteria grow in/on coils and fins clogging them and reducing the efficiency of a system
• Bacteria on coils and fins can generate odors that become a severe irritant and may lead to health issues
Cleaning Protocols Do Not Remove Biofilm 19
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Biofilm Challenge
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Close-up of coil after conventional cleaning (note black tar like substance is biofilm)
Microscopic cleaning of coil using engineered EFM after conventional cleaning
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What Is Biofilm? • Biofilms are aggregates of predominately bacterial cells attached to and growing on
a surface (Costerton J.W. and Stewart, P.S., 2001 Battling Biofilms. Sci. Am., 285:74-81. )
• A biofilm forms when bacteria begin to excrete a slimy, sticky substance that allows them to adhere to surfaces
• This extracellular polymeric substance (EPS),is what provides the biofilm with increased resistance to antimicrobial agents, heat/cold and cleaners
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Micro-organisms (bacteria, fungi, algae…) Biofilm EPS binding matrix (exopolysaccharides, proteins…) BIOFILM
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Our Solution to Bio Film • Environmentally-friendly surfactants, enzymes and Environmentally Friendly
Microorganisms (EFM) break down biofilm and release trapped dirt • We clean at the microscopic level • After cleaning we restore and maintain a healthy balance of EFM by
automatic delivery tied into the HVAC system controls • Our EFM products are naturally biodegradable and do not use harsh
chemicals – Agent constituents are on the Generally Recognized as Safe (GRAS)
list • Return HVAC systems to “like new” condition
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Coleman A. Young Municipal Center EFMs Show Dramatic Results
686 605 109 311
786 805 295 360
749 870 392 249
One Year After Initial GreenAir Process
Velocity (ft/min)
1241 677 521 721
763 1184 560 557
1018 962 727 724
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Results of second cleaning and EFM Treatment Velocity (ft/min)
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Coleman A. Young Municipal Center Probiotic Results
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Performance curve mimics geometric biological reproduction curve
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∆T Pre-EFM Treatment
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Return Air 76°
Supply Air 50°
∆T = 26°
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Return Air
Supply Air
78°
48°
∆T increased to 30°, an increase of 15 %
∆T Post-EFM Treatment
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Questions?
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