ACtion Magazine - April 2013 - (Page 22)
R-1234yf design and
by MACS Staff
hree veteran engineers presented what Jim Baker called
“a talking knowledge of R-1234yf.” Jim Baker was a
senior research scientist at Delphi Corporation, involved
in design and development of vehicle refrigerant
systems. He also served on technical committees that
developed refrigerant recovery/recycle technology and A/C
system lubricants. After retiring from Delphi, Jim founded JAB
Consulting LLC, where he now serves the whole mobile A/C
industry as a consultant.
Tim Craig is an engineer with Delphi Thermal Systems and has
worked in systems design and development and HVAC module
design and development. His work is currently focused on alternate
refrigerants and development of advanced A/C systems.
Jim Graham is also an engineer at Delphi whose long career
includes test development for thermal management systems and
A/C compressor testing and development. He is currently managing
validation tests of Delphi’s aftermarket A/C compressors.
Given these gentlemen’s experience and connections, it’s
safe to say the information they presented is at the cutting edge
of mobile A/C technology. Beginning with a short history of
automotive A/C, Baker then provided an overview of recent
technology developments and government regulations. He pointed
out that even though there is no U.S. requirement to change
refrigerants, the European ban of R-134a “creates an opportunity
for (U.S.) automakers” to earn CO2 credits by switching to the new
refrigerant. Guiding us through complex charts and graphs, Baker
demonstrated how air conditioning contributes about 5.5% of the
typical vehicle’s impact on global warming through both direct
(refrigerant leakage/venting) and indirect (tailpipe) emissions.The
goal of developing new refrigerants and service procedures is to
eliminate the direct impact.
When describing chemical and technical details of R-1234yf,
including its flammability, Baker showed that “it takes about
5000 times more energy to ignite this stuff than anything else
we call fuel.” He then cited the many new SAE standards that
guide system design, service procedures and technician training/
Craig and Baker described minor changes in the R-1234yf refrigerant system.
ACTION • April 2013
Table of Contents for the Digital Edition of ACtion Magazine - April 2013
ACtion Magazine - April 2013
Under the Southern Cross
News & Updates
State of the Industry
R-1234YF Design and Service Considerations
Heavy Duty/Off Road Technical Session
Hybrid Evolution Continues
Modern Automotive HVAC Systems
Old-Timers, Team Players, Slackers and Kids: Do Your Employees ‘play’ Well Together?
Cheap Isn’t Always Best
A/C Season Check List: Is Your Shop Ready?
MACS 2013 Training Event Social Wrap-Up
Wallace Talks Up Big Brother
New Products & Services
ACtion Magazine - April 2013