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Energies 2020, 13, 5654 (a) (b) Figure 15. System’s temperatures (a) and pressures (b)—19 July 2018—11:40/12:40. (a) (b) Energies 2020, 13, x FOFRigPuErEeR1R6E. VSyIEsWtem’s temperatures (a) and pressures (b)—22 August 2018. (a) (b) Figure 17. System’s temperatures (a) and pressures (b) —22 June 2018—11:30/16:30. 15 of 18 15 of 17 Table 5 summarizes the EER values for the heat pump and for the heat pump coupled with the Table 5. EERHP and EERsys in cooling period. hydronic system, for the investigated days in June, July, and August, and for the selected on-off cycle of the heat pump. Day Period EERHP EERsys The EER of the heat pump is defiAnleldaays the thermal5e.n89ergy withdraw3n.7a9t the user-side of the 12:55/13:55 5.17 3.62 heat pump (Q2), divided by the electrical energy absorbed by the compressor of the CO2 cycle (Pcomp,L). 29 June All day 3.50 2.76 On the other hand, the EER of the system is defined as the thermal energy withdrawn at the user- 19 July 11:40/12:40 3.78 2.70 side of the heat pump (Q2), divided by the electrical energy absorbed by the compressor of the low- (3) 22 August All day 4.13 4.09 temperature cycles (Pcomp,L) and by the auxiliaries of the hydronic system (Paux). Day EERHP= Q2 Period P EERHP EERsys 3.79 3.62 2.76 (3) (4) 29 June 19 July ◦◦◦ 13:30/16:30 𝑄 3.61 3.47 𝐸𝐸𝑅 𝑃, The EER of the heat pump is defined as the thermal energy withdrawn at the user-side of the heat 𝐸𝐸𝑅 𝑄 (4) pump (Q ), divided by the electrical energy absorbed by the compressor of the CO cycle (P ). 2 𝑃, 𝑃 2 On the other hand, the EER of the system is defined as the thermal energy withdrawn at the user-side of During these days, the source temperatures are 18 °C, 19.4° C, and 19.6 °C for June, July, and the heat pump (Q2), divided by the electrical energy absorbed by the compressor of the low-temperature August, respectively, and it can be seen that higher source temperatures lead to lower EER values. cycles (Pcomp,L) and by the auxiliaries of the hydronic system (Paux). Table 5. EERHP and EERsys in cooling period. All day 5.89 12:55/13:55 Q2 5.17 EERsys = P +P comp,L aux All day 3.50 comp,L comp,L During these days, the source temp1e1r:a4t0u/r1e2s:4a0re 138.78C, 192.4.70C, and 19.6 C for June, July, and August, respectively, and it can be seen tAhallt dhaigyher so4u.r1c3e temp4.e0r9atures lead to lower EER values. 22 August From the monitoring campaign, the E13E:R30a/1n6d:3C0OP 3o.f61the he3a.t47pump and of the entire system were evaluated. In particular, when considering the operation during the month of July, a heat pump From the monitoring campaign, the EER and COP of the heat pump and of the entire system were evaluated. In particular, when considering the operation during the month of July, a heat pump EER of 3.55 and a system EER of 2.74 have been found. As for the heating operation, in December, the heat pump COP was 2.15, while the system COP was 2.01. 5. ConclusionsPDF Image | Novel Ground-Source Heat Pump with R744
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