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Energies 2021, 14, 8238 16 of 25 Figure 9. Trend of the gas-cooler heat flow rate as a function of time, EXP vs. NUM. 4.2. Preliminary Results in Chiller Configuration The validation of the numerical model of the refrigerating system operating according to the chiller configuration is discussed here presenting two different cases. In both cases the system runs with a single compressor and a single evaporator: in the first one, the hot water production at the brazed plate gas-cooler is taking place while in the second one it is not. Differently from the heat pump configuration, where each component of the system was validated ensuring a satisfying accuracy of the numerical model, in the chiller configu- ration, the model accuracy will depend strongly on the accuracy of the numerical model of the multi-phase ejector. When the brazed plate gas-cooler is bypassed, the input are given by TIN = 34.8 ◦C, IN .−1IN◦air φair =84%fortheairsideandmwater =2.4kgs ,Twater =12.3 Cforthewatersideat the evaporator. Experimental data were used to critically discuss the thermodynamic cycle (Figure 9), the energy flows of the system (Electrical power and heat flows), as well as the operating point of the ejector (Table 8). During the test, the high pressure set point value was set equal to 88.5 bar while the low-pressure receiver set point temperature was set equal to 39.8 bar. The results of the validation point were consistent with the ones presented for the heat pump operations in the previous section. The ejector equilibrium point was predicted with reasonable accuracy in terms of the recirculation factor but with a lower pressure lift. This caused the increase in the evaporation pressure visible in Figure 10. Except for this, the model obtained a good accuracy in terms of the thermodynamic description of the cycle. The compressor’s power consumption was underestimated (in the expected range 5–10%) with respect to the measured one as already discussed previously, while the heat transfer was correctly modelled. The underestimation of the power consumption led to the COP overestimation.PDF Image | Dynamic Modelling and Validation of an Air-to-Water Reversible R744
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