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Energy evaluation of drop-in replacements for R134a in cascade CO2/R134a refrigeration units
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.
2018 (English)In: Refrigeration Science and Technology, International Institute of Refrigeration, 2018, p. 1147-1153Conference paper, Published paper (Refereed)
Abstract [en]

The energy performance of CO2 standard booster systems is limited in countries with high ambient temperatures to replace R404A direct expansion architectures. Therefore, cascade refrigeration systems with CO2 in the low-pressure stage can be considered. Most of the conventional cascade refrigeration systems rely on using R134a, a high global warming potential (GWP) refrigerant, in the high pressure stage. However, R134a needs to be replaced by lower GWP refrigerants to meet the targets of current environmental agreements. This study investigates R450A and R513A refrigerants as drop-in replacements to R134a in R134a/CO2 cascade refrigeration units. The experimental energy performance results suggest that both R450A and R513A can substitute R134a in cascade systems. R513A provides comparable COP and cooling capacity values to R134a, whereas the cooling capacity and COP of R450A are lower than that of the baseline R134a.

Place, publisher, year, edition, pages
International Institute of Refrigeration, 2018. p. 1147-1153
Keywords [en]
Cascade system, Climate change, CO2, Energy assessment, GWP, HFC substitution, Carbon dioxide, Drops, Energy efficiency, Environmental regulations, Global warming, IIR filters, Pollution control, Refrigerants, Cascade refrigeration, Cascade refrigeration systems, Cascade systems, Direct expansion, Energy evaluation, Energy performance, Global warming potential, Refrigeration
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236409DOI: 10.18462/iir.gl.2018.1373Scopus ID: 2-s2.0-85049870210ISBN: 9782362150265 (print)OAI: oai:DiVA.org:kth-236409DiVA, id: diva2:1259030
Conference
13th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerant Solutions for Warm Climate Countries, 18 June 2018 through 20 June 2018
Funder
Swedish Energy Agency
Note

QC 20181026

Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2018-10-26Bibliographically approved

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Makhnatch, PavelKhodabandeh, Rahmatollah

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