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Energies 2021, 14, 4103 7 of 28 respectively. The pivoting suction port of the particular compressor refers to the possibility of selecting the suction manifold connection and integrating it in either the LT section or the INT parallel section. Thus, flexibility is significantly enhanced as the integrated system can swiftly adapt the number of compressors assigned to a particular suction group [33]. Both pivoting compressors work in support of the LT base compressor at low ambient temperature and high SH loads. During operational conditions with high ambient tem- peratures and dominant AC cooling loads, the pivoting compressors are employed at the INT level. Thus, the number of compressors employed at each pressure level is adjusted to meet both heating and cooling loads without the need for additional compressors. FROM GAS COOLERS MV2 FGV TO GAS COOLERS COMPRESSOR RACK 1 2 3 4b (VSD) (VSD) DV DV 34 FROM EVAPORATORS TO EVAPORATORS IHX 2 MV3 LIQUID RECEIVER EVAP AC , 2 AC COOLING a) Parallel compression (PC) MV3 FROM GAS COOLERS MV2 TO GAS COOLERS COMPRESSOR RACK 1 2 3 4b (VSD) (VSD) DV DV 34 FROM EVAPORATORS TO EVAPORATORS IHX 2 LIQUID RECEIVER EVAP AC , 2 AC COOLING FGV b) Ejector-supported parallel compression (EJ) Figure 2. Alternative design of CO2 integrated system with (a) parallel compression (PC), and (b) ejector-supported parallel compression (EJ). Both configurations presented in Figure 2 are equipped with two AC evaporators, which are applied to provide cooling in series at different pressure levels. EVAPAC,1 is installed at the INT pressure level and relies on gravity self-circulation from the liquid receiver. The evaporator is installed below the liquid receiver and is fed through a liquid column from the bottom of the receiver, creating a static pressure difference. The cooling load is determined based on the chilled water mass flow rate and the INT pressure level. EVAPAC ,1 EJECTOR EVAPAC ,1 HPV FGT FGT IHX 1 IHX 1PDF Image | Evaluation of Integrated Concepts with CO2 for Heating
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