Tony D Posted July 8, 2010 Share Posted July 8, 2010 Nobody makes variable displacment compressors for that small service in portable applications. They are far too expensive. Variable orifice works on change of state. It still relies on overcompression and accumulation/capacitance for fundamental operation. Only large stationary plants use variable displacement compressors to lower the electrical load required to compress the refrigerant to the required pressures and volumes to accomplish the BTU transfer required. Quote Link to comment Share on other sites More sharing options...
bens1088 Posted July 8, 2010 Share Posted July 8, 2010 after reading everything I still believe that this is the most efficient cooling system. Quote Link to comment Share on other sites More sharing options...
Xnke Posted July 9, 2010 Author Share Posted July 9, 2010 TonyD, most new MVAC systems are using a variable displacement compressor now...Not that hard to find in the junkyard. Quote Link to comment Share on other sites More sharing options...
Tony D Posted July 9, 2010 Share Posted July 9, 2010 What is the control scheme on these compressors, sliding valve driven by PWM? Quote Link to comment Share on other sites More sharing options...
Xnke Posted July 10, 2010 Author Share Posted July 10, 2010 I'm not entirely sure yet, but I know the A/C compressors that come on the newer LSx motors in the vette and camaro are variable displacement. I would think something similar to what you are suggesting. Quote Link to comment Share on other sites More sharing options...
Tony D Posted July 11, 2010 Share Posted July 11, 2010 The Harrison/Delphi V5 series uses a variable swash plate on the pistons, much like hydrostatic pumps. This is old technology, been in play for years in hydraulics. Apparently it has finally trickled down. From what I can see they use a pressure-balancing bellows. So is this the pump you aim to use? Toyota is also using a Variable Displacement unit which may fit in a standard Sanden footprint. If not, then what I stated still stands about accessories, all they do is affect state change, the item doing the work still overcompresses and wastes energy--using a non VDP the selection should be the smallest pump available to compress the medium for most efficient operation with system capacitance sized for anticipated transients. Quote Link to comment Share on other sites More sharing options...
Xnke Posted July 11, 2010 Author Share Posted July 11, 2010 I was looking at some toyota applications; and some subaru; the subarus use a simple to mount compressor, but I don't think it's variable displacement. It's hard to tell externally; for me at least, because i'm not entirely sure what' I'm looking at. Quote Link to comment Share on other sites More sharing options...
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