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The thermo-valve: a device for expanding compressed liquids and simultaneously gaining heat.

Die Thermodrossel: Eine Anlage zur Entspannung Komprimierter Flüssigkeiten unter Wärmeabgabe.

Author(s) : KELLER J. U., GÖBEL M. U.

Type of article: Article

Summary

The COP of compression refrigeration cycles and heat pumps can be increased by substituting the expansion valve (throttle) by a so-called thermo-valve or heating vortex tube. This is a device in which compressed liquid working fluid coming in at ambient temperature is partly expanded. The saturated steam generated is superheated by liquid working fluid coming in subsequently. Then the steam is sent to a Ranque-Hilsch vortex tube to be expanded to evaporator's pressure level. The hot end flow of gas leaving the vortex tube is cooled down in another heat exchanger and after this either recombined with the cold end flow leaving the tube and fully expanded liquid stream or directly sent back to the compressor of the cycle. For refrigeration cycles and heat pumps using R22 or R134a this increase can be about 5 and 10% respectively. However, if CO2 is used as working fluid the increase may be about 15% for refrigerators and 25% for room heating only heat pumps.

Details

  • Original title: Die Thermodrossel: Eine Anlage zur Entspannung Komprimierter Flüssigkeiten unter Wärmeabgabe.
  • Record ID : 1998-0224
  • Languages: German
  • Source: KI Luft Kältetech. - vol. 33 - n. 2
  • Publication date: 1997/02
  • Document available for consultation in the library of the IIR headquarters only.

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