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Energies 2021, 14, 8238 7 of 25 Figure 4. Schematic of the refrigerating system operating according to the chiller configuration, two compressors, and two evaporators. When the system was operating with both semi-hermetic compressors, CO2 mass flow rate was not measured by the Coriolis meter, due to its limited FS. The performance of each compressor was then validated against the manufacturer’s polynomials independently from the other, with dedicated tests considering different compressor ratio and frequencies. In Figure 5a, the mass flow rate is reported for both the fixed speed and the inverter controlled compressor. Percentage errors were on average 3%, which is within the tolerance admitted by EN12900:2013 for mass flow declared data and the measurement accuracy. Figure 5. Comparison between nominal and experimental performance for fixed speed compressor (Compressor(1)) and inverter modulated compressor (Compressor(2)): (a) mass flow rate; (b) electrical power consumption.PDF Image | Dynamic Modelling and Validation of an Air-to-Water Reversible R744
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