IIR document

Expansion valves and zeotrope refrigerants.

Author(s) : SCHMIDT F.


Refrigerants with a glide of more than 4 K includes the risk of having change in composition after vapour leaks. Change in composition resulting in a bubble-dew point change of more than 1-2 K includes the risk of having liquid coming back to the compressor. This could, in worst case, result in compressor damage because of liquid hammer. To avoid this, the thermostatic expansion valves must be adjusted to a higher superheat than for pure refrigerants. Electronic expansion valves, based on 2 temperatures are not sensitive to dew point changes, and in connection with an adaptive superheat control this control system is independent on refrigerant type and changes in composition for zeotrope refrigerants.

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  • Original title: Expansion valves and zeotrope refrigerants.
  • Record ID : 1996-0869
  • Languages: English
  • Source: For a Better Quality of Life. 19th International Congress of Refrigeration.
  • Publication date: 1995/08/20
  • Document available for consultation in the library of the IIR headquarters only.


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