ACtion Magazine - April 2013 - (Page 22)

R-1234yf design and service considerations by MACS Staff T 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/ certification. Craig and Baker described minor changes in the R-1234yf refrigerant system. 22 ACTION • April 2013

Table of Contents for the Digital Edition of ACtion Magazine - April 2013

ACtion Magazine - April 2013
Freeze Frame
Virtual View
Under the Southern Cross
Leonard’s Law
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
Association News
Quick Check
New Products & Services
Last Watch

ACtion Magazine - April 2013