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Experimental comparison between R134a/R744 and R438A/R744 (drop-in) cascade refrigeration systems based on energy consumption and greenhouse gases emissions
Univ Fed Uberlandia, Sch Mech Engn, Av Joao Naves Avila 2121, BR-38400902 Uberlandia, MG, Brazil.
Univ Fed Uberlandia, Sch Mech Engn, Av Joao Naves Avila 2121, BR-38400902 Uberlandia, MG, Brazil.
Univ Engn & Technol, Dept Mech Mech & Mfg Engn, Lahore, Pakistan.
Natl Univ Singapore, Dept Mech Engn, Singapore, Singapore.
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2021 (engelsk)Inngår i: Energy Science & Engineering, ISSN 2050-0505, Vol. 9, nr 12, s. 2281-2297Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This experimental study evaluates the energy performance and climatic changes of a cascade cooling system operating with the R134a/R744 pairs (cooling capacity of 4.5-6 kW) and R438A/R744. In both cases, the low-temperature refrigerant, R744, operated under subcritical conditions. The experimental apparatus basically consists of two vapor-compression cycles coupled by a plate cascade condenser. Two operational variables, from R744 cycle, were controlled: the degree-of-superheat and the compressor frequency. The experiment was initially assembled to pair R134a/R744. Subsequently, the R134a refrigerant charge in the high-temperature cycle was replaced by R438A, on a drop-in basis. The two systems, R134a/R744 and R438A/R744, were compared for similar cooling capacities and cold chamber air temperatures. Results showed that the energy consumption of the high-temperature compressor, operating with R438A, was higher than R134a for all tests. As a result, the COP values for R438A/R744 were 30% lower than those for R134a/R744. The greenhouse gases emissions of the two systems were evaluated using the total equivalent warming impact factor, TEWI, whose value for the R438A/R744 pair was approximately 29.5% higher, compared with R134a/R744. Since R438A was originally designed to substitute R22, a few comparative tests were carried out with the latter, always with R744 as the low-temperature cycle working fluid.

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2021. Vol. 9, nr 12, s. 2281-2297
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URN: urn:nbn:se:mdh:diva-56206DOI: 10.1002/ese3.976ISI: 000703741100001Scopus ID: 2-s2.0-85116144665OAI: oai:DiVA.org:mdh-56206DiVA, id: diva2:1603252
Tilgjengelig fra: 2021-10-14 Laget: 2021-10-14 Sist oppdatert: 2021-12-16bibliografisk kontrollert

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