Thread: LPG as Refrigerant

So what made the York reciprecating piston compressor better than the Sandem woble plate? Was it just the different gas that was used? Do they get to compress the gas to a higher pressure? or is it the throughput? Or was there more to these Valinat AC systems?

I think cars today have a greater amount of glass as the we have less vertical and more sloped glass specially on the windscreen and rear glass on sedans.

Yes, lots less horizontal glass, more metal, more upright side windows, less black/dark colours on dash and interior. Invariably a white/off-white interior roof lining... Cars felt more spacious in those days, despite the lack of picture windows... Heaps less dash area to heat up and soak into the air ducts etc.

Also bigger and properly sized A/c's.. Plus a design theory that the air-con was supposed to PERFORM on very hot days, not peg out because its 'unusually hot' as some other car makes seem to do. - I once heard that excuse from a F*** Service Advisor...

I recall being told that the York compressor was a more effective pump that its "equivalent" rotary. - Not the fault of the rotary idea, just the bulldust figures, and the replacement rotary was smaller... but smoooother.

Yes,I can remember driving east long ago, the bitumen was melting, slippery too, ( -but we got a free layer of sound-deadener under the wheel arches!)
- and having to open the windows a bit now and again to thaw out.

Good Old Days James in Gosnells.

The Sanden is more efficient than the York & possibly more robust.

As others have said,today we have systems that are undersized,particularly in Jap vehicles.
Small condensers don't help much on a hot day!

Originally Posted by scarry

The Sanden is more efficient than the York & possibly more robust.

As others have said,today we have systems that are undersized,particularly in Jap vehicles.
Small condensers don't help much on a hot day!

Those cast iron Yorks were always specified with the big "Clima" systems that had almost the entire market for a/c on mining equipment in Queensland. Most of the mines insisted on only Clima systems being supplied on dozers, loaders, dump trucks etc. They were very robust, repairable, high capacity for the very high ambient temperatures encountered and for cooling the shed on very heavy vehicles & machines that had been thoroughly heat soaked.

R134a isn't as good on a hot day either.

Originally Posted by Dougal

R134a isn't as good on a hot day either.

If it has the correctly sized condenser,it isn't far away from R12,that is at auto air type conditions.

At medium temperatures,that is cold rooms,there is very little difference in capacity of the two,unless of course the are other problems with the system,such as a corroded condenser,or whatever.We changed hundreds of systems from R12 to 134a for the govt,and never touched a TX valve,only did oil changes,& also replaced any system components with rubbers in them,such as solenoid valves,shaft seals,etc.Same for changing R502 to R507.

At lower back pressures it also needs a larger displacement compresser,to have the same capacity as R12.

Overall,R12 was much better over it's working range & was also more forgiving.

Originally Posted by Brian Hjelm

Those cast iron Yorks were always specified with the big "Clima" systems that had almost the entire market for a/c on mining equipment in Queensland. Most of the mines insisted on only Clima systems being supplied on dozers, loaders, dump trucks etc. They were very robust, repairable, high capacity for the very high ambient temperatures encountered and for cooling the shed on very heavy vehicles & machines that had been thoroughly heat soaked.

Brian,

I wonder what compressers they use today?
The one's we used on overhead cranes all used Bock compressers.I can't remember the brand of the A/C units.Other's used HG 1000's,but the Bocks were better.

Many small trawlers used the HG's,but most used Kelvinators,K,T &Y,they were the best by a country mile.We are getting off track here,this was for refrigeration.

Originally Posted by scarry

If it has the correctly sized condenser,it isn't far away from R12,that is at auto air type conditions.

At medium temperatures,that is cold rooms,there is very little difference in capacity of the two,unless of course the are other problems with the system,such as a corroded condenser,or whatever.We changed hundreds of systems from R12 to 134a for the govt,and never touched a TX valve,only did oil changes,& also replaced any system components with rubbers in them,such as solenoid valves,shaft seals,etc.Same for changing R502 to R507.

At lower back pressures it also needs a larger displacement compresser,to have the same capacity as R12.

Overall,R12 was much better over it's working range & was also more forgiving.

Yeah the "correctly sized condensor" appears to be the critical part. When the condensor is struggling R12 and HC refrigerants seem to have the upper hand.