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Energies 2020, 13, 5654 Energies 2020, 13, x FOR PEER REVIEW 14 of 18 14 of 17 14 of 17 Energies 2020, 13, x FOR PEER REVIEW (a) (a) (b) (b) Figure 13. System’s temperatures (a) and pressures (b)—29 June 2018—12:55/13:55. Figure 13. System’s temperatures (a) and pressures (b)—29 June 2018—12:55/13:55. (a) (b) (a) (b) Figure 14. System’s temperatures (a) and pressures (b)—19 July 2018. Figure 14. System’s temperatures (a) and pressures (b)—19 July 2018. (a) (b) (a) (b) Figure 15. System’s temperatures (a) and pressures (b)—19 July 2018—11:40/12:40. Figure 15. System’’s temperatures (a) and pressures (b)—19 July 2018—11:40/12:40. The representative day for June was 29, when the heat pump was on nearly 9 h. The high pressure of the cycle at the gas cooler varied between 45 and 70 bar while the low pressure and suction pressure were in the range of 25 and 50 bar, as for the other analyzed summer days. Table 5 summarizes the EER values for the heat pump and for the heat pump coupled with the hydronic system, for the investigated days in June, July, and August, and for the selected on-off cycle of the heat pump. (a) (b) (a) (b) Figure 16. System’s temperatures (a) and pressures (b)—22 August 2018. Figure 16. System’s temperatures (a) and pressures (b)—22 August 2018.PDF Image | Novel Ground-Source Heat Pump with R744
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