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R744 BOOSTER INTEGRATED SYSTEM ( r744-booster-integrated-system )

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*Manuscript Click here to view linked References 1 2 3 4 5 6 7 8 9 R744 BOOSTER INTEGRATED SYSTEM FOR FULL HEATING SUPPLY TO SUPERMARKETS Paola D’Agaro, Giovanni Cortella*, Alessio Polzot Polytechnic Department of Engineering and Architecture, University of Udine via delle Scienze 206, 33100 Udine, Italy *corresponding author, giovanni.cortella@uniud.it 10 11 12 13 14 15 16 17 18 19 20 the other hand, the high discharge temperature potentially allows recovering a large amount of heat at 21 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 EER 61 62 63 64 65 ABSTRACT In warm climates carbon dioxide (R744) refrigeration systems are known to perform worse because of the transcritical operation which occurs for a large part of the year, increasing substantially their energy use. On various temperature levels. This paper investigates the energy performance of a R744 refrigeration system 22 23 24 25 load required by the chilled and frozen food storage and display equipment. The system is controlled to meet 26 which provides a medium-sized supermarket with DHW and space heating, besides satisfying the cooling the full heating demand of the building and is equipped with an additional air-cooled evaporator, which can 27 28 29 30 interactions with the building and the HVAC, are carried out at three climate conditions. The results are 31 be used as a supplemental heat source. Dynamic simulations of the refrigeration system, including mutual compared to alternative refrigeration systems not controlled by the heating demand, such as the R744 booster 32 33 34 35 employed for heating. Energy saving was predicted both when compared to the CO2 system (up to 4.5 %), 36 system itself, a R404A direct expansion system and a R134a/R744 cascade system, where heat pumps are and to the HFC systems (up to 16 %). Furthermore, the heating COP of the integrated system appears to be 37 38 39 40 The comparison shows that heat recovery can fully supply refrigeration and heating needs of the supermarket 41 always higher than that of standalone heat pumps. with reduced running and possibly investment costs when compared to separate systems. KEYWORDS: R744; COP; refrigeration; modelling; heat recovery; heating NOMENCLATURE COP coefficient of performance DHW domestic hot water Energy Efficiency Ratio



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