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AHRI_Refrigeration_Alternatives_Overview
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The Future of Refrigerants For Commercial Refrigeration Applications
David B. Calabrese General Counsel
Sr. Vice President, Public Policy Air-Conditioning, Heating, and Refrigeration Institute
Representing
ICARHMA
Established 1991
Purpose − Unite and strengthen
the voice of global industry
− Focus on energy efficiency and environmental stewardship
Members AREMA -- Australia ABRAVA – Brazil HRAI – Canada CRAA – China EUROVENT – Europe EPEE – Europe JRAIA – Japan KRAIA – Korea AHRI – United States
Refrigerants Are Vital
Used in Air-conditioning − Vital for personal Health, Comfort, and Well-being
Used in Refrigeration − Prolong life of perishable food
− Keep life-saving medicines safe
They Improve: − Health, Productivity, and Safety
What is Commercial Refrigeration?
It is the “R” in HVACR
Ubiquitous in developed world; increasingly widespread use in developing nations
Benefits: − Health
− Environmental
− Economic
Refrigeration Applications diverse − Differing temperatures, system architecture, charge amounts, leak
potential
Semi-Vertical Display Case
A medium temperature merchandiser with multiple display levels arranged in a staggered configuration used for the display and sale of fresh meat, deli, dairy, or produce products. − No doors or covers.
Multi-Deck, Vertical Display Refrigerated Merchandiser
A medium temperature merchandiser with multiple display levels used for the display and sale of fresh meat, deli, dairy, or produce products. − No doors or covers.
Chilled Transparent Vertical Door Display Cabinets
Accessible for removal by the customer by opening a hinged or sliding transparent door. − The unit may or may not be
self-contained and include a condensing unit.
Multi-Deck, Vertical Display Frozen Food Merchandiser
A low temperature merchandiser with multiple display levels used for the display and sale of ice cream or frozen products. − No doors or covers.
Frozen Transparent Vertical Door Display Cabinets
Low temperature or application product temperature vertical display case accessible for removal by the customer by opening a hinged or sliding transparent door. − The unit may or may not be
self-contained and include a condensing unit.
What Refrigerants are Used Today?
In stand-alone or self-contained systems (est. 32M + 21M vending machines):
− R-22; R134A; R404A (most common in Europe)
In remote refrigeration systems (est. 34M worldwide)
− R-134A; R-22; R404A R-407C; R-507; other HFC or HCFC blends
In multiplex rack systems (est. 15M worldwide)
− R-22 (most common); R-12; R-502; R-404A; R-507A;
R407A; several HCFC and HFC blends designed to retrofit CFC or HCFC systems
How About Alternatives?
Hydrocarbons: − Isobutane (R-600A) (Primarily used in northern Europe) − Propane (R-290) (Growing use in self-contained equipment) − Propylene (R-1270) (Used in condensing unit and indirect multiplex rack
systems in northern Europe)
Ammonia (R-717) − Introduced as primary refrigerant in indirect systems in northern Europe
and Africa
CO2 (R-744) − Increasing use in vending machines − Secondary refrigerant in indirect systems in U.S.
HFCs and HFOs − Recent use in multiplex rack systems
Refrigeration System Designs
Direct Expansion Systems − Most Common Type
− Refrigerant directly cools
− 404A transitioning to 407A and 407F
− Disadvantages: High refrigerant charge; parasitic losses (temp/pressure); refrigerant leaks
Refrigeration System Designs
Distributed Systems
− Array of separate compressor racks
− Can lower refrigerant charges 30-50%
− Still account for 40% of new U.S. installs; indirect systems gaining significant market share
Refrigeration System Designs
Indirect Systems − Lower refrigerant charges
50-90%
− Chiller to cool secondary fluid to cases/coolers
− Now the norm in Europe
− Low leak potential (5% or less); low pressure loss; but fluid issues/losses
Refrigeration System Designs
Distributed secondary loop − can use HFCs or
hydrocarbons, ammonia C02
− compact chiller
− cascade designs
• C02
• High first cost
• More precise
Things to think about:
Maintaining refrigerant choice
Evaluating refrigerant characteristics for informed choices
Making transition predictable, smooth and informed
Goal – Appropriate Successor Refrigerants to HFCs
No ozone depletion
Low total global warming potential (LCCP/TEWI) − Direct
− Indirect
Safe
Economical
Choosing a Refrigerant
Cannot be based on one factor
Must be based on an analysis of all factors: − Safe
− Energy efficient
− Widely available
− Economical
Will be different for different applications
Ammonia
Benefits
Economical
Low GWP (<1)
Efficient
Available
Drawbacks
Flammable
Highly toxic
Incompatible with copper and copper alloys
Hydrocarbons
Benefits
Efficient
Low Toxicity
Economical
Low GWP
Drawbacks
Highly flammable
Prohibited by some building codes
CO2
Benefits
Low GWP
Economical
Non-flammable
Drawbacks
Operates at higher pressures
Expensive System
Prone to leaks
Not efficient at high ambients
ICARHMA Policy Statement
Many factors go into decisions on refrigerants:
Not just GWP but also, − Cost effectiveness for intended application
− Energy efficiency
− Safety
− Operating pressures
− Capital and operating costs
− Operating temperatures
In addition, national, regional, and local laws
Law of Unintended Consequences
Most economic sectors are inter-connected
Policy makers need to be sure that: − Policies do not reduce emissions in one sector while increasing in
another
− Low emissions should not be at expense of overall efficiency
− Efficiency must be maximized in all situations
Planning for Phase-Down of High GWP Refrigerants
Business needs predictability
Research into new generation of refrigerants
Determining positives and negatives for alternatives
Barriers to Use of Alternative Refrigerants
Recently completed project summarizes barriers region-by-region − CO2, Ammonia, Hydrocarbons, R-32, and HFO-
1234yf
Conclusion: Most would be restricted in Japan, U.S., EU.
Not just technical barriers but also legislative and regulatory barriers
Low-GWP Alternative Refrigerant Evaluation
Program (Low-GWP AREP)
Cooperative research program to identify suitable alternatives to high GWP Refrigerants
Research strongly desired by OEMs − Assess research needs
− Accelerate industry’s response to environmental challenges
− Avoid duplicative work
Objectives − Identify low GWP alternative refrigerants − Establish testing protocols − Conduct tests − Publish results
.
Low-GWP Alternative Refrigerants Evaluation Program (Low-GWP AREP)
Thirty-eight low-GWP refrigerant candidates are being tested.
Twenty-one entities are conducting tests globally:
Low-GWP AREP Program
Testing is nearly complete
Interim report was released in September 2012
Technical papers presented at
− Purdue Conference
− ASHRAE/NIST Refrigerants Conference
− Kobe Conference
First test reports released late November
Remaining reports will be available to the public in early 2013.
Summary
Different situation than when transitioned from HCFCs to HFCs
Still searching for alternatives
Broadened our consideration to include refrigerants that were disqualified before because they were toxic and/or flammable
We have the time to do the necessary research
But we must be serious and expend the resources commensurate with challenge
We have a good record as an industry
Thank You!