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N2O/CO2-mixtures as refrigerants for temperatures below -50 °C

  • The EU F-Gas Regulation grants exceptions from the GWP-related placing on the market prohibition for stationary refrigeration equipment for applications below -50 °C. Nonetheless, non-flammable refrigerants, which can be used for that temperature range, become increasingly expensive and rare inside the EU due to the phase down of HFCs under the regulation. Flammable alternatives based on methane, ethane and ethylene are available, but are not viable for all applications due to their flammability. Carbon dioxide cannot be used for applications below -50 °C due to CO 2 ’s triple point at -56 °C. Nitrous oxide with a triple point at -92 °C seems to be an alternative. However, possible exothermal decomposition of N 2 O calls for additional measures in order to be able to operate such systems safely. Two low-temperature systems have been developed, built and successfully operated at evaporation temperatures down to - 80 °C with mixtures of N 2 O and CO 2 and different lubricants at ILK andThe EU F-Gas Regulation grants exceptions from the GWP-related placing on the market prohibition for stationary refrigeration equipment for applications below -50 °C. Nonetheless, non-flammable refrigerants, which can be used for that temperature range, become increasingly expensive and rare inside the EU due to the phase down of HFCs under the regulation. Flammable alternatives based on methane, ethane and ethylene are available, but are not viable for all applications due to their flammability. Carbon dioxide cannot be used for applications below -50 °C due to CO 2 ’s triple point at -56 °C. Nitrous oxide with a triple point at -92 °C seems to be an alternative. However, possible exothermal decomposition of N 2 O calls for additional measures in order to be able to operate such systems safely. Two low-temperature systems have been developed, built and successfully operated at evaporation temperatures down to - 80 °C with mixtures of N 2 O and CO 2 and different lubricants at ILK and Karlsruhe University of Applied Sciences. The units achieved similar energy efficiency as the standard HFC-equipment used for freeze drying. Possible decomposition of N 2 O could successfully be supressed by various measures.zeige mehrzeige weniger

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Metadaten
Autoren/innen:Enis Askar, M. Kauffeld, T. Maurath, J. Germanus
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):International Journal of Refrigeration
Jahr der Erstveröffentlichung:2020
Organisationseinheit der BAM:2 Chemische Sicherheitstechnik
2 Chemische Sicherheitstechnik / 2.1 Explosionsschutz Gase, Stäube
Verlag:Elsevier Ltd.
Jahrgang/Band:117
Erste Seite:316
Letzte Seite:327
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Carbon dioxide; Freeze-dryer; Low temperature; Nitrous oxide; Safety measures
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Infrastruktur / Sicherheit von Industrieanlagen und Verkehrswegen
DOI:https://doi.org/10.1016/j.ijrefrig.2020.04.026
ISSN:0140-7007
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:29.06.2020
Referierte Publikation:Nein