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The Future of Refrigerants
Charles Allgood, PhDRefrigerants Technology Leader – Chemours2017 HVAC Excellence, Orlando FL
@refrigchemours
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“Prediction is very difficult; especially if it’s about the
future.”
- Neils Bohr
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Agenda
The Chemours Story A Historical View of Refrigerants Environmental Concerns and Regulations HFO’s – Why and How Optimizing for the Future Available Resources Q & A
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Inventors ofInventors of
The Chemours Story
New company created from
DuPont Performance
Chemicals
July 2015
New company created from
DuPont Performance
Chemicals
July 2015Industry Leader
…with over 85 years of
experience in refrigeration
Industry Leader
…with over 85 years of
experience in refrigeration
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What is the Future of Refrigerants?
Finding the Right Solution Functionality Cost Availability
Installed Systems & New Equipment
Evolving Regulatory Landscape
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Agenda
The Chemours Story A Historical View of Refrigerants Environmental Concerns and Regulations HFO’s – Why and How Optimizing for the Future Available Resources Q & A
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1800 – 1920’s
Ammonia (NH3), Methyl Chloride (CH3Cl), and Sulfur Dioxide
1920’sFatal Accidents with CH3ClPeople moved refrigerators to their backyards
Collaborative Search for Safer Refrigerants byGeneral Motors, Frigidaire, & DuPont
1928 Thomas Midgley and Charles Kettering invent a “miracle compound” called Freon®
A Brief History of Refrigerants
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The Freon® Age Begins
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Agenda
The Chemours Story A Historical View of Refrigerants Environmental Concerns and Regulations HFO’s – Why and How Optimizing for the Future Available Resources Q & A
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Worldwide focus on:
“Ozone Depletion” “Climate Change”
Why Do We Need New Refrigerants Now?
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100% -7%
-37%-55%
-69% -76%-79%
050
100150200
Regulations Driving Change
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The Regulatory Challenge for Refrigeration
R-22 is getting phased out R-404A/507 will soon be unacceptable for retrofit & new equipment
Please consult local country-specific regulations. HFC unacceptability described is based on US EPA SNAP Program change of status for refrigerants, issued July 20, 2015, and applies to refrigeration racks. For complete overview of SNAP program regulations by product and application, please consult www.epa.gov/significant-new-alternatives-policy-snap
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US Regulations: EPA Section 608
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“Predicting rain doesn’t count. Building arks does.”
- Warren Buffet
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15
Selection of Refrigerants for the Future Will Need to Balance Performance (Capacity and Efficiency), Safety and Sustainability, and Total Cost of System Ownership.
1930s
CFCs(R-12)
ChlorineSingle Bond
High ODPHighest GWP
1950s
HCFCs(R-22)
Less ChlorineSingle Bond
Lower ODPHigh GWP
1990s
HFCs(R-134a)
No ChlorineSingle Bond
No ODPHigh GWP
TODAYHFOs and
HFO Blends(R-1234yf, 1234ze, R-449A, 513A, etc.)
No ChlorineDouble Bond
No ODPVery Low GWP
1800s–1920s
Industrial Chemicals
(Methyl Chloride, Ammonia, CO2, etc.)
Industrial Chemicals
(CO2, Hydrocarbons, Ammonia)
+
History of Refrigerant Transitions
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• Not new, some of the earliest refrigerants
• Used currently where they make sense (safety and efficiency concerns)
• Rebranding as “natural “ products, but:
− The so-called “natural” refrigerants are actually industrial gases produced in large chemical processing facilities
− These facilities use energy to create or isolate, purify CO2, hydrocarbons and ammonia
− They also use feedstocks and generate wastes similar to other chemical manufacturing processes
Industrial Gases as Refrigerants – Food for Thought
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Hydrocarbon Manufacture – e.g. propane, isobutane
• Hydrocarbons are produced in an oil refinery or natural gas processing plant
• There are several process steps to produce high purity refrigerants such as propane:
Source: https://en.wikipedia.org/wiki/Natural-gas_processing
Example Processing steps: Condensate and water removal Acid gas removal Dehydration Mercury removal Nitrogen removal Natural gas liquid recovery Fractionation Sweetening purification units
Natural Gas Process StepsStart
Finish
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Ammonia Manufacture
• Ammonia is primarily produced by reaction of nitrogen with hydrogen
• However, there are several steps preceding this, starting with natural gas feedstock:
Ammonia Plant
1. Sulfur removal from natural gas feedstock:H2 + RSH → RH + H2S (gas)
2. Hydrogen sulfide absorption through beds of zinc oxide:H2S + ZnO → ZnS + H2O
3. Catalytic steam reforming to form hydrogen plus carbon monoxide:
CH4 + H2O → CO + 3H2
4. Catalytic shift conversion to carbon dioxide and more hydrogen:CO + H2O → CO2 + H2
5. Carbon dioxide is then removed by absorption.6. Catalytic methanation to remove small amounts of CO and CO2
CO + 3H2 → CH4 + H2OCO2 + 4H2 → CH4 +2H2O
7. Hydrogen is then catalytically reacted with nitrogen to form anhydrous liquid ammonia, and purified
3H2 + N2 → 2NH3
Source: https://en.wikipedia.org/wiki/Ammonia_production
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CO2 Manufacture
CO2 is primarily produced by:• Combustion of fossil fuel (e.g. coal, oil, gas)• Separation of the CO2 from the combustion product stream (e.g. flue gas)• Several purification steps
CO2 separation and purification from power plant flue gas
Herzog, H, “The Economics of CO2 Separation and Capture, MIT Energy Laboratory, Journal of the Franklin Institute, 2000.
CO2 Production Options
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ADJECTIVE1. existing in or caused by nature; not made or caused by humankind:
"carrots contain a natural antiseptic that fights bacteria"
2. of or in agreement with the character or makeup of, or circumstances surrounding, someone or something:
"sharks have no natural enemies"
3. (of a parent or child) related by blood:"such adopted children always knew who their natural parents were"
Naturaladjective nat·u·ral \ˈna-chə-rəl, ˈnach-rəl\
What is “Natural”?
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“Natural” – Not a scientific or engineering term• Not something that can be measured, tested
− i.e. US FDA – no real definition• Controversial usage in advertising/marketing hype
− “All-natural”, “Natural”− Foods, supplements, cosmetics, cleaners, disinfectants, etc.
“Occurring in Nature” is a low and not very useful criteria:Water, Helium, Air, Carbon DioxideSulfur Dioxide, Ammonia, Natural Gas, Methylene ChlorideLead, Arsenic, MercuryStrychnine, Anthrax, Botulinum
What is “Natural”?
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…should be based on:• Measurable data and objective chemical, physical, thermodynamic
and environmental properties
• Standard and reproducible engineering principles, measurementsand testing
For Example:− Boiling Point− Vapor Pressure− Heat Capacity− Ozone Depletion Potential− Atmospheric Lifetime
Not on ill or undefined, marketing hype or political buzz words, i.e. Natural
Evaluation of Working Fluids in Refrigeration Systems…
− Global Warming Potential− Toxicity (Acute, Chronic, etc.)− Flammability (LFL, UFL, Burning Velocity)− Heat of Combustion)− Energy Efficiency
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Selection of Refrigerants for the Future Will Need to Balance Performance (Capacity and Efficiency), Safety and Sustainability, and Total Cost of System Ownership.
1930s
CFCs(R-12)
ChlorineSingle Bond
High ODPHighest GWP
1950s
HCFCs(R-22)
Less ChlorineSingle Bond
Lower ODPHigh GWP
1990s
HFCs(R-134a)
No ChlorineSingle Bond
No ODPHigh GWP
TODAYHFOs and
HFO Blends(R-1234yf, 1234ze, R-449A, 513A, etc.)
No ChlorineDouble Bond
No ODPVery Low GWP
1800s–1920s
Industrial Chemicals
(Methyl Chloride, Ammonia, CO2, etc.)
Industrial Chemicals
(CO2, Hydrocarbons, Ammonia)
+
History of Refrigerant Transitions
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Agenda
The Chemours Story A Historical View of Refrigerants Environmental Concerns and Regulations HFO’s – Why and How Optimizing for the Future Available Resources Q & A
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Atmospheric Life rates of destruction reactions ( hydroxyl radical )
Huge Variation between different molecules
k
.[OH-]HFC
= Atmospheric Lifetime x Infrared Absorbance
What Exactly is a Global Warming Potential (GWP)?
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Designing a Low GWP Molecule
Molecule Structure Atmospheric Lifetime
GWP
PFC-116 CF3-CF3 No hydrogen
HFC-134a CH2F-CF3 2-H atoms
HFO-1234yf CH2=CF-CF3 “Olefin”
10,000 years 11,100
13 years 1300
10 days < 1
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HFCHydro fluorocarbon
HFOHydro fluoro olefin
Double bond in HFOs Quicker breakdown in the atmosphere,
yet stable in systems
How HFOs Work
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R-134a HFO-1234yf
Formula CH2FCF3 CF3CF=CH2
Molecular Weight 102 114
ODP 0 0
GWP100 (AR5) 1300 <1
T Critical Point 102 ºC 95ºC
Boiling Point -26ºC -29ºC
Same operating conditions as 134a (similar P/T curve)
Capacity and efficiency similar to HFC-134a
Vapor Pressure
0
0.5
1
1.5
2
2.5
3
3.5
-40 -20 0 20 40 60 80 100
134a
1234yfPre
ssur
e, M
Pa
Temperature, oC
Very low GWP but Mildly Flammable
HFO-1234yf Similar to HFC-134a
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A Brief Introduction to Flammable Refrigerants
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Refrigerant Flammability Classifications
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Highly Flammable
Non-Flammable
Moderately Flammable
Mildly Flammable
Flammability Classification
Examples:
Propane, Isobutane
R-152a
R-1234yf, R-452B
R-134a, R-410A1
2
3
To meet 2L flammability, burning velocity must be ≤ 10 cm/s
2L
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Primary Flammability Parameters
• Lower / Upper Flammability Limits (LFL / UFL)– Minimum / Maximum concentrations of a substance
in air that exhibit flame propagation (usually shown as volume % in air).
• Minimum Ignition Energy (MIE)– Minimum energy required to ignite a flammable
gas / air mixture. Sources with energy levels below this value will not result in an ignition.
• Burning Velocity (BV)– The velocity of a laminar flame under given values
of composition, temperature and pressure.
• Heat Of Combustion (HOC)– Heat per unit mass (or mole) released by the
combustion of a substance.
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Parameter Risk Trend
Lower LFL
Larger (UFL – LFL)
Lower MIE
Higher UFL
Higher HOC
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Flammable Property Comparison
R-290(Propane) R-152a R-717
(Ammonia) R-1234yf
Safety Rating A3 A2 B2L A2L
LFL (vol. %) 2.2 3.9 15.0 6.2
UFL (vol. %) 10.0 16.9 28.0 12.3
UFL – LFL (vol. %) 7.8 13.0 13.0 6.1
MIE (mJ) 0.25 0.38 100 - 300 > 5,000
BV (cm/s) 46 23 7.2 1.5
HOC (kJ/g) 46.3 16.5 18.6 10.7
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Understanding Pressure Rise on Ignition
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Reference: B. Hill, MACS January 21, 2010
t = 63 ms 125 msec 250 msec 500 msec 750 msec
IsobutaneElect. Arc4 vol%
R-152aElect. Arc8 vol%
HFO-1234yfElect. Arc – no ignLighter – above 4 vol%, no ignElect. Arc + butane → ign8 vol%, orange flame is butane
Watch the ping pong balls for pressure rise
HFO-1234yf flames can best be characterized as “lazy and unstable” with low energy release
1 m3 enclosed spacedenotes event
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Codes & Standards Activities
• Standards updates required to address flammable refrigerant needs
• Code updates also required– UMC, IMC, IRC, NFPA
• EPA activities– SNAP
• Industry activities supporting flammable refrigerants– Joint ASHRAE-AHRI-DOE research
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Working Safely with Flammables
• Identification
• Controlling charge size / room area
• Eliminating ignition sources
• Leak detection
• Mitigation strategies
• Best work practices
• Education & training
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Changes to Service Equipment for A2Ls
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SAE International – HFO-1234yf accepted - Safe for use; low environmental impact
HFO-1234yf selected by Auto OEMs globally to meet EU MAC Directive
Million’s of 1234yf cars on the road, but:
What about Stationary Refrigeration ?
Global Adoption of HFO-1234yf by Automotive Ind.
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Agenda
The Chemours Story A Historical View of Refrigerants Environmental Concerns and Regulations HFO’s – Why and How Optimizing for the Future Available Resources Q & A
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Opteon™ Offers the Optimal Balance of Properties
Capital Costs + Operation Costs
______________Total Cost of Ownership
Efficiency +Capacity
_____________Performance
Zero ODP Low GWP No or low
flammability
Commercially Available
Safety & Sustainability
Commercial Availability
Total Cost of Ownership
Performance
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Opteon™ Low GWP HFO Products for Refrigeration
R-22(HCFC)
GWP: 1760
XP40(R-449A)
GWP: 1282
XL20(R-454C)
GWP: 146
R-404A/R-507(HFC)
GWP: 3943
XP40(R-449A)
GWP: 1282
XP44(R-452A)
GWP: 1945
XL40(R-454A)
GWP: 237
XL20(R-454C)
GWP: 146
R-134a(HFC)
GWP: 1300
XP10(R-513A)
GWP: 573
YF(R-1234yf)GWP: <1
Incumbent Gas
Non-Flammable Replacement
Mildly Flammable Replacement
Not Yet Commercial for
Refrigeration in US
Not Yet Commercial for
Refrigeration in US
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Meeting Regulatory Goals with an Optimal Balance of Performance and Sustainability
Meets regulatory requirementsNon-ozone depletingSNAP listed; 67% lower GWP vs. R-404A/507
Reduces energy consumptionUp to 12% energy savings
Extends life of existing equipment
Replaces R-22,404A,507,408A,HP80Major OEM approvals: Emerson, Bitzer, Carlyle
Commercially available• Emerson (Copeland), Bitzer & Tecumseh Approved• Thousands of supermarkets & commercial
refrigeration systems already using R-449A globally
Opteon™ XP40 (R-449A)
Non-flammable, Non-toxic (A1)
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ASHRAE #: R-449ABlend Components: R-1234yf/134a/125/32 Blend Composition: 25.3/25.7/24.7/24.3
Replaces R-22 & R-404A
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R-22 Retrofit Success
Conversion from R-22 to Opteon™ XP40 (R-449A)October 2015
• Average Energy benefit of 8% (5-12% range, depending on rack & ambient)
• Changed Lubricant to POE
• No changes to equipment or piping
• Tweaked TXVs for optimized performance
• Met cooling demand
• Stable operation
Daily Energy Usage Pre & Post Retrofit
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R-404A/CO2 Cascade System Retrofit Success
R-404A/CO2 hybrid cascade system R-404A MT rack with six screw
compressors System has programmable EEVs Covers 73 cabinets and 7 cold store
rooms Filter drier replaced, EEVs
programmed, no other changes
7%
Energy Consumption
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Environmental Benefit of Retrofitting to Opteon™ XP40
Consider 100 stores running on R-22, approx. 1 ton refrigerant charge/store, leaking 10%/yr• Conversion to R-407A 1,630 tons higher greenhouse gas emissions each year• Conversion to Opteon™ XP40 4,780 tons lower greenhouse gas emissions each year
Consider 100 stores running on R-404A, approx. 1 ton refrigerant charge/store, leaking 10%/yr• Conversion to Opteon™ XP40 26,610 tons lower greenhouse gas emissions each year• Added indirect benefit of up to 12% reduced energy consumption
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Lot’s of Choices
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Agenda
The Chemours Story A Historical View of Refrigerants Environmental Concerns and Regulations HFO’s – Why and How Optimizing for the Future Available Resources Q & A
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Resources from Chemourswww.freon.comwww.opteon.com
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General Replacement Guide
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Product Bulletins
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Retrofit Guidelines
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R-22 to Freon™ MO99 On-line Training Videos
*Freon™ MO99 Retrofit Guidelines &Freon™ MO99 Retrofit Video – www.freon.com
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Case History
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Technical InformationThermodynamic & Transport Properties
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Technical InformationPressure-Temperature Data & Pressure-Enthalpy Diagrams
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Technical Information – P/T Calc AppAll the information you need in the field, right on your mobile device!
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Technical Information – Refrigerant Expert Tool
Designing or evaluating a system? Our FREE software can help!
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Do you have a plan?
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Refrigerant Management
Five R’s:1. Record-keeping2. Repair Leaks3. Recover & Reclaim4. Replace old equipment e.g., R-410A5. Retrofit to Zero ODP refrigerants
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Summary of Low GWP Products for Refrigeration
R-22(HCFC)
XP40(R-449A)
XL20(R-454C)
R-404A/R-507(HFC)
XP40(R-449A)
XP44(R-452A)
XL40(R-454A)
XL20(R-454C)
R-134a(HFC)
XP10(R-513A)
YF(R-1234yf)
Environmentally sustainableInfrastructure ready
Trained work-forceOEM’s, Components, ToolsDecades of experience in system design and
optimizationManufacturing and supply chain ready
Comparable to Improved Energy EfficiencyCompetitive on total cost basisCommercial products compatible with new, remodel & installed base
R-22R-404A/507R-134aR-407A/407F
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Chemours Invests in the Future
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Chemours Announces Major Investments in New U.S. HFO-1234yf PlantInnovative Opteon™ YF Process in Corpus Christi to Triple Chemours’ World-Leading Capacity
WILMINGTON, DE; May 2, 2016 – Chemours will invest $230 million over 3 years to construct the new facility at the Corpus Christi site in Ingleside, Texas, with start-up expected in 3rd quarter of 2018.
This investment will triple the capacity of Opteon™ products, enabling Chemours to capitalize on a cornerstone growth opportunity. This investment will create the world’s largest facility for manufacturing HFOs, and the location will allow Chemours to efficiently service the growing market in North America and Europe, as well as the rest of the world. Today Chemours is the capacity leader for HFO-1234yf based products, a position that will be maintained through this investment.
Chemours Announces Major Investments in New U.S. HFO-1234yf PlantInnovative Opteon™ YF Process in Corpus Christi to Triple Chemours’ World-Leading Capacity
WILMINGTON, DE; May 2, 2016 – Chemours will invest $230 million over 3 years to construct the new facility at the Corpus Christi site in Ingleside, Texas, with start-up expected in 3rd quarter of 2018.
This investment will triple the capacity of Opteon™ products, enabling Chemours to capitalize on a cornerstone growth opportunity. This investment will create the world’s largest facility for manufacturing HFOs, and the location will allow Chemours to efficiently service the growing market in North America and Europe, as well as the rest of the world. Today Chemours is the capacity leader for HFO-1234yf based products, a position that will be maintained through this investment.
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“I Touch the Future. I Teach.”
- Christa McCauliffe
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Acknowledgements
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Thank you!Thank you!
Chuck Allgood, PhDRefrigerants Technology Leader