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Energies 2020, 13, 5654 (a) (b) 12 of 18 Figure 10. System’s temperatures (a) and pressures (b)—29 December 2018. (a) (b) Figure 11. System’s temperatures (a) and pressures (b)—29 December 2018—9:00/10:00. Figure 11. System’s temperatures (a) and pressures (b)—29 December 2018—9:00/10:00. SInimTialabrlec4o,ntshiedevraalutieosnfsocratnhebheedaotnpeumfoprC29ODPeacnedmfboerrth2e01s8y,swtemhenCOthPe,fhoerathpeuinmvpesrteigsuatletsdtdoabyes oinpeNraotvinemg nbearralyndwDitheoceumt ibneterr, raunpdtifonrst.hIen stehliescctaesde,otnh-eoeffleccytrcilceaol fentheerghyedatempuamndpedarbeyshthoewcnom. pressors oftheTheaCtOpuPmHPpocfotmhephresastoprsudmuprinisgdtehfeinwedhoalsetdhaeytihse2r9m1aklWenhe,rngeyardleyli5v6e%remdoarteththeaunsfeorr-stihdedoafythoef 4heDaetcpeumbper(.QIn1),tdhievsidamedebwyatyh,etheeleectlericctarliceanlerngeyrgabysaobrsboerdbbedy tbhyetchoemapurxeislisaorrisesofisthnealorlwy t(hPrcoemep,Lt)imaneds whiigth-2te9mapgaerinatsutr1e1ckyWclehsf(oPrcomthp,He).dOayntohfe4oDtheecrehmabnedr,.tIhneaCdOdPitsyisoonf,tthestyhsetremailsedneefringeydraelsetahsedthaetrmthael uenser-gsyiddeeolifvtehredHaPt tahneduwseirth-sdidraewofntfhreomheathtepugmropun(Qd1i)s, dabivoiudted54b%y thhigeheelercftorirc2a9l eDnecrgemy abbesr,owrbiethd abny athmeocuonmtporfe6ss3o1rasnodf t3h5e0lokwWahn, drehspigehc-ttievmelpy.erAatsusrheocwycnleisn(PFicogmup,Hre+1P1cbom,p,tLh)eanhdigbhyptrheessaurxeiloiafrtiheseocfytchle ahtytdhreongiacsscyosotelemr (vPaaruixe).s between 80 and 85 bar, while the low pressure and suction pressure at the 𝑄 compressor are between 35 and 40 bar. In this last case, the values of LP are lower than the other two 𝐶𝑂𝑃 𝑃 𝑃 (1) days because of the lower temperature of theheat,sourceth,at affects the evaporating temperature and 𝑄 the relative pressure at the evaporator side. As can be seen in the charts, the inlet temperature of the 𝐶𝑂𝑃 𝑃 𝑃 ◦ 𝑃 ◦ (2) heat carrier fluid at the evaporator movesfro,m about,11 Cto about 8 C. On the other hand, at the During these days, the source temperatures are 12 °C, 9.5 °C, and 7.1 °C for November and 4 gas cooler, the steady-state pressure after the first phase of the switching-on of the heat pump is about and 29 December. ◦ 80 bar. This is due to the control system that regulates the outlet temperature at the gas cooler at 35 C, as previously described in the Heat Pump section of the text. Considering the months of November and December, the temperature of the water entering the condenser at the user side of the heat pump is about 60 ◦C and 63 ◦C, respectively. The water is then heated up to 67/71 ◦C, maintaining an average storage tank temperature of 67.5 ◦C. At the source side of the heat pump, the heat carrier fluid from the BHE field loop has a monthly average temperature of 13.5 ◦C in November and 8.4 ◦C in December. The fluid is then cooled inside the evaporator to 9 ◦C and 6 ◦C in November and December, respectively. In Table 4, the values for the heat pump COP and for the system COP, for the investigated days in November and December, and for the selected on-off cycle of the heat pump are shown. Table 4. COPHP and COPsys in heating period. Day 18 November 4 December 29 December Period All day 6:28/7:26 All day 8:09/9:00 All day 9:00/10:00 COPHP COPsys 2.16 2.05 2.15 2.06 2.16 2.04 2.18 2.07 2.17 1.98 2.17 1.96 The COPHP of the heat pump is defined as the thermal energy delivered at the user-side of the heat pump (Q1), divided by the electrical energy absorbed by the compressors of the low (Pcomp,L) and high-temperature cycles (Pcomp,H). On the other hand, the COPsys of the system is defined as the thermal energy delivered at the user-side of the heat pump (Q1), divided by the electrical energyPDF Image | Novel Ground-Source Heat Pump with R744
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