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Retrofit of lower GWP alternative R449A into an existing R404A indirect supermarket refrigeration system
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
Energi & Kylanalys AB.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2017 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 76, 184-192 p.Article in journal (Refereed) Published
Abstract [en]

R404A is going to be phased out from most of the commercial refrigeration systems due to its high GWP value of 3943. R449A (GWP of 1282) has been proposed to replace R404A with only minor system modifications in supermarkets. This paper presents the measurements of a light retrofit replacement of R404A using R449A in a medium temperature indirect refrigeration system (secondary fluid temperature at the evaporator outlet between −9 and −4 °C). It has been demonstrated that with a slight expansion device adjustment and 4% increase of refrigerant charge, R449A can be used in this refrigeration system designed for R404A because of its suitable thermodynamic properties and acceptable maximum discharge temperature. At a secondary fluid temperature at condenser inlet of 30 °C, the COP of R449A nearly matches that of R404A (both were between 1.9 and 2.2), despite having approximately 13% lower cooling capacity. As a conclusion, attending to the GWP reduction and similar energy performance, it was demonstrated using the TEWI methodology that the use of the recently developed refrigerant R449A in these applications can reduce the total CO2equivalent emissions of an indirect supermarket refrigeration system designed for R404A refrigerant.

Place, publisher, year, edition, pages
2017. Vol. 76, 184-192 p.
Keyword [en]
Supermarket refrigeration; R404A; R449A; HFC HFO mixture; Low GWP; Alternative refrigerant
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-203869DOI: 10.1016/j.ijrefrig.2017.02.009OAI: oai:DiVA.org:kth-203869DiVA: diva2:1082850
Available from: 2017-03-18 Created: 2017-03-18 Last updated: 2017-03-18

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
  • html
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  • asciidoc
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