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Sylvain Quoilin Chapter 5 : Models Figure 43 shows the agreement between the predicted and measured value of the supply pressure in the condenser for the third set of tests. The error between the predicted and measured values is high for many points. In particular, the point circled in red shows a very high error. It corresponds to the test 040507E, in which the refrigerant charge is increased to its maximum acceptable value. It is possible that the supply of the condenser is in twophase state for this tests, which could explain the very high error. It is obvious that the condenser doesn't act as expected by the model. This unexpected behavior of the condenser has already been highlighted during the experiments, in chapter 4.4.3. A deeper investigation is needed here to understand these results. Figures 44 shows the agreement between the predicted and measured values of the pressure drop over the condenser for the third set of tests : The agreement between the two values is acceptable except for a few points : ● The two points circled at the right of the picture correspond to experiments in which an important refrigerant charge is introduced in the circuit. This error is thus linked to the one explained above. ● A group of points corresponding to the test 030507 shows a very high error on the left. However, the problem seems to come from the measurement and not from the model. The pressure drop is indeed negative for 2 of those points, which is of course unrealistic. This error is due to a malfunction of the pressure transducer measuring pr , ex ,cd . The pressure transducer is replaced after that test. Figure 44: Predicted vs measured pressure drop over the condenser 88PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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