1993-10-01

Fleet Trials with Vehicles Retrofitted to HFC-134a Refrigerant and Ester Lubricants - Two Years on the Road 932905

This paper profiles the North American retrofit fleets (vehicle types and run conditions), and describes the results seen with these trials. After two cooling seasons in both Australia and North America, we have begun to remove vehicles from the fleet, and examine them for durability and system chemistries.To date, there have been no systematic performance or durability issues. The service requirements of the fleet have been typical of those seen with equivalent CFC-12 vehicles, as shown by specific examples.Results indicate that OEM rubber hoses likely provide sufficient containment for HFC-134a in retrofit situations, and that adequate compressor durability may be expected with the lubricants used. Bench testing with molecular sieve and silica type desiccants at least suggest that existing desiccants may be sufficiently stable to be used in retrofit conditions. This is indirectly supported by fleet tests, though at this point, there is still insufficient field information to make conclusive recommendations in this area.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
X