Cristin-resultat-ID: 1162392
Sist endret: 10. oktober 2014, 14:06
NVI-rapporteringsår: 2014
Resultat
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
2014

R744 Ejector supported parallel vapour compression system

Bidragsytere:
  • Armin Hafner
  • Jonas Schönenberger
  • Krzysztof Banasiak og
  • Sergio Girotto

Bok

3rd IIR International Conference on Sustainability and the Cold Chain 23rd 24th and 25th June 2014, St Mary’s University, Twickenham, London, UK
ISBN:
  • 978‐2‐36215‐003‐6

Utgiver

International Institute of Refrigeration
NVI-nivå 1

Serie

Science et technique du froid
ISSN 0151-1637
NVI-nivå 1

Om resultatet

Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Publiseringsår: 2014
Hefte: 2014-1
ISBN:
  • 978‐2‐36215‐003‐6

Klassifisering

Fagfelt (NPI)

Fagfelt: Energi
- Fagområde: Realfag og teknologi

Beskrivelse Beskrivelse

Tittel

R744 Ejector supported parallel vapour compression system

Sammendrag

The average energy use of European supermarkets is in the range of 300 to 600 kWh/m2 (Energy star, 2008; Arias, 2005). Around 50% of the energy is used to the refrigeration equipment which provides cooling and freezing capacity for the display cabinets and the cold / freezing storage rooms. Most of the current refrigeration systems are applying HFC 404A as the working fluid. In Accordance to the survey in the latest IPCC/TEAP Special Report (2007), the average annual leakage rates of existing European HFC supermarket units are between 15 and 20 % of the total refrigerant charge. On a global perspective the commercial refrigeration leakage rates are around 30 %, while HCFC 22 is the most common refrigerant. Therefore, effort should be given to identify alternative refrigerants which are able to improve the energy efficiency compared to current HFC solutions. Preference should be given to natural working fluids, since their long term environmental impact can be foreseen and they minimize the direct GWP contribution. Currently there are more than 2000 commercial refrigeration system, applying carbon dioxide (R744), manly located in Central- and Northern Europe. The efficiency challenge related to ordinary R744 booster systems operated at high ambient temperatures (Finckh, 2011) can be overcome by an improved system design as described in this paper. As one possible example, an enhanced R744 commercial refrigeration system with parallel compressor technology and ejector support is described, as implemented in a large supermarket in the region of Fribourg (Switzerland) during summer 2013. First measurement results are analysed and evaluated. Copyright © 2014 IIR/IIF. All rights reserved

Bidragsytere

Aktiv cristin-person

Armin Hafner

  • Tilknyttet:
    Forfatter
    ved Energibruk ved SINTEF Energi AS

Jonas Schönenberger

  • Tilknyttet:
    Forfatter
    ved Sveits

Krzysztof Banasiak

  • Tilknyttet:
    Forfatter
    ved Energibruk ved SINTEF Energi AS

Sergio Girotto

  • Tilknyttet:
    Forfatter
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