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Open AccessFeature PaperArticle

Performance Evaluation of a CO2 Refrigeration System Enhanced with a Dew Point Cooler

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Barbara Hardy Institute, School of Engineering, University of South Australia, Mawson Lakes Campus, Mawson Lakes 5095, SA, Australia
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Future Industries Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes 5095, SA, Australia
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Author to whom correspondence should be addressed.
Energies 2019, 12(6), 1079; https://doi.org/10.3390/en12061079
Received: 22 February 2019 / Revised: 15 March 2019 / Accepted: 15 March 2019 / Published: 20 March 2019
(This article belongs to the Section Sustainable Energy)
Dew 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. View Full-Text
Keywords: CO2 refrigeration system; dew point cooler; evaporative cooling; subcritical operation; transcritical operation CO2 refrigeration system; dew point cooler; evaporative cooling; subcritical operation; transcritical operation
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MDPI and ACS Style

Belusko, M.; Liddle, R.; Alemu, A.; Halawa, E.; Bruno, F. Performance Evaluation of a CO2 Refrigeration System Enhanced with a Dew Point Cooler. Energies 2019, 12, 1079.

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