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Performance evaluation of a CO₂ refrigeration system enhanced with a dew point cooler

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dc.contributor.authorBelusko, M.
dc.contributor.authorLiddle, R.
dc.contributor.authorAlemu, A.
dc.contributor.authorHalawa, E.
dc.contributor.authorBruno, F.
dc.date.issued2019
dc.description.abstractDew point cooling (DPC) is a novel indirect evaporative cooling concept capable of delivering air temperatures approaching the dew point. Coupling this technology with CO₂ refrigeration is well suited to minimising transcritical operation when the coefficient of performance (COP) is dramatically reduced in hot climates. A substantial experimental program was conducted to characterise this combination by testing a 20 kW CO₂ refrigeration system subject to ambient temperatures above 40 °C. It was demonstrated that DPC operation not only avoided transcritical operation during such weather conditions, but also increased the COP by up to 140% compared to the conventional system. The combination of these technologies was successfully mathematically modelled, from which the optimum condenser inlet air temperature was identified for each condenser temperature. Using this optimum condition, it was possible to maximise the COP for a range of conditions applicable to the psychometric chart. An annual case study for Adelaide, Australia was conducted which demonstrated that optimally coupling DPC with CO₂ refrigeration can reduce the annual energy consumption and peak demand by 16% and 47%, respectively, compared to a conventional CO₂ booster system. Furthermore, the number of hours of transcritical operation was reduced from 3278 to 27.
dc.identifier.citationEnergies, 2019; 12(6):1-22
dc.identifier.doi10.3390/en12061079
dc.identifier.issn1996-1073
dc.identifier.issn1996-1073
dc.identifier.urihttps://hdl.handle.net/11541.2/136485
dc.language.isoen
dc.publisherMDPI AG
dc.relation.fundingSouth Australian Government
dc.relation.fundingGlaciem Cooling Technologies
dc.rightsCopyright 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution(CC BY) license (http://creativecommons.org/licenses/by/4.0/)
dc.source.urihttps://doi.org/10.3390/en12061079
dc.subjectCO2 refrigeration system
dc.subjectdew point cooler
dc.subjectevaporative cooling
dc.subjectsubcritical operation
dc.subjecttranscritical operation
dc.titlePerformance evaluation of a CO₂ refrigeration system enhanced with a dew point cooler
dc.typeJournal article
pubs.publication-statusPublished
ror.fileinfo12172009740001831 13171929440001831 9916269611001831.pdf
ror.mmsid9916269611001831

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