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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 for a long time over the year, the electrical energy consumption of B system is lower than in the other two 35 Figure 8. Monthly electrical energy consumption values of the BHR and B systems The comparison between the BHR and B configurations in terms of monthly electrical energy consumption is reported in Figure 8 for the selected climate conditions. R744 refrigeration systems are known to perform worse in mild climates than in cold climates (Cavallini and Zilio, 2007, Finckh et al., 2011, Sawalha 2017). When space heating is not needed, the BHR coincide with B and the performance of the system is highly sensitive to the gas cooler exit temperature. In climate 3, which is characterized by low ambient temperatures climate conditions, up to 19% less than climate 1 between June and September. On the other hand, when heat recovery for space heating is activated, the BHR consumption is much higher than B system for climate 3 36 37 38 39 and just slightly higher for the other two climate conditions. 40 On an annual basis, the electrical consumptions are reported in Table 5. The R744 booster system controlled 41 42 43 44 climate 2 and up to 37% more in climate 3 than the B system. It should be noticed that the heat recovery 45 to cover the total heating demand of the supermarket (BHR) consumes just 2% more in climate 1, 9% in levels off the annual consumptions among the three climates. 46 47 48 49 the consumption of a separate system supplying the space heating demand (B+HPs). 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 A more complete comparison can be done adding to the electrical consumption of the refrigeration system BPDF Image | R744 BOOSTER INTEGRATED SYSTEM
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