PXV - Differential Pressure Controlled Valve
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Application: Mobile Air Conditioning

Partners: Otto Egelhof

Contacts:

Christian Blauth, Germany
Frank Wolf, Austria
PXV - Differential Pressure Controlled Valve
Description:

Expansion device with pressure difference dependent mass flow rate

Basic specifications:

  • Overall Weight: 5 g
  • PXV Diameter: 7,9 mm
  • PXV Length: ~58 mm
  • Filter Mesh Size: 80 mm
  • Filter Surface: 500 mm2
  • PXV mass flow curve adaptable on system/costumer requirements
  • Integrated pop open function
  • NVH improved
  • Pulsation testing completed
  • Rough road durability testing completed
System Requirements:

  • Optimized internal system volume and relation between Lp and HP volume
  • Optimized system charge
  • PXV curve has to be adapted to system size and performance
Advantages:

  • Max Cool Down Performance @ transcritical operation
  • Close to COP Optimum @ transcritical operation
  • COP @ subcritical conditions outperforms R134a
  • On mode energy savings through pop open function
  • Lower cost than R134a TXV&
  • Lower weight and easier packaging
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