ACtion Magazine - March 2013 - (Page 18)
SAE International’s CRP continues to study
safety of R-1234yf use in automobiles
The SAE International Cooperative Research Project
(CRP1234-4) team, which formed last year, met faceto-face during the week of February 4th, 2013. As the
CRP continues to review relevant research and testing to
finalize the risk assessment, the high level of confidence
that R1234yf can be used safely in automotive applications
continues to grow. The findings of the original CRP1234
remain well founded in that R-1234yf poses no greater risk
than other engine compartment fluids.
The CRP continues its process of carefully reviewing the
use of R1234yf by using universally accepted engineering
methods, including analysis of recent OEM testing from
actual vehicle crash data, on-vehicle simulations, laboratory
simulations, bench tests, and over 100 engine compartment
refrigerant releases. Based on this testing the CRP has found
that the refrigerant is highly unlikely to ignite and that
ignition requires extremely idealized conditions.
The SAE CRP team of OEMs has also identified that
the refrigerant release testing completed by Daimler was
18
Reader Reply
ACTION • March 2013
unrealistic by creating the extremely idealized conditions
for ignition while ignoring actual real world collision
scenarios. These conditions include specific combinations of
temperature, amount and distribution of refrigerant, along
with velocity, turbulence, and atomization, which are highly
improbable to simultaneously occur in real-world collisions.
The CRP continues to populate the fault trees to insure
completeness of the risk assessment through pragmatic
and factual input based on the latest and most accurate
data available. Fault tree analysis as conducted by the
CRP is the most appropriate approach for evaluating risks
of new alternative refrigerants. This approach has been
recommended and employed by numerous public and private
organizations including the U.S. Environmental Protection
Agency, the U.S. Department of Energy, the International
Electrotechnical Commission, the European Union Joint
Research Centre and the United Kingdom Health and Safety
Executive.
The CRP notes with disappointment the recent decision
by Daimler to discontinue its participation in the group.
This was followed shortly thereafter by BMW and Audi also
leaving the CRP. The new CRP began by conducting a
detailed review of the original Fault Tree Analysis (FTA).
Primarily in response to Daimler’s concerns, the original FTA
was significantly expanded to encompass new parameters
and incorporate their recent test results. The FTA process
is enhanced by having contributions from multiple parties
representing a diversity of experience and expertise, building
toward consensus under the spirit of collaboration.
The SAE International CRP1234-4 team formed last year
to perform an updated engineering review of R-1234yf
refrigerant and continues to meet regularly to review and
share test information completed since the close of the
original CRP1234-3 in 2009. The original CRP1234-3
concluded that R-1234yf is a safe and acceptable alternative
refrigerant for mobile air conditioning systems that can be
used to meet new environmental standards and consumer
needs. The CRP is targeting the second quarter of 2013 for
the completion of its work and the publication of a final
report.
The SAE CRP1234-4 team includes European, North
American and Asian OEMs including Chrysler/Fiat, Ford,
General Motors, Honda, Hyundai, Jaguar Land Rover,
Mazda, PSA, Renault and Toyota.
SAE International Cooperative Research Programs (CRP)
provide neutral environments for joint venture projects
where numerous organizations pool their resources and
expertise to study areas of common technical interest where
results are shared. The information contained in press releases
from SAE International CRPs reflects the collective opinion
of the partner organizations of the CRP teams.
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Table of Contents for the Digital Edition of ACtion Magazine - March 2013
ACtion Magazine - March 2013
Contents
Outlook
In Bin
Freeze Frame
Under the Southern Cross
Leonard’s Law
Virtual View
News & Updates
Managing the Heat
Delphi Restores 1954 Pontiac Star Chief With First ‘Front Mounted A/C System’
Replacement Actuator Motor Cautions From HeaterTreater
Association News
In Memorium
Quick Check
New Products & Services
Last Watch
ACtion Magazine - March 2013
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