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Sylvain Quoilin Chapter 4 : Description of the experiments 4.3 Critical analysis of the two first sets of measurements This analysis is based on the 32 tests performed from October 13th to November 21st and described above. The first 13 tests were already treated successively by Vincent Lemort and Cristian Cuevas in three internal reports. The purpose of this chapter is to give an explanation to the incoherencies detected in those tests and to extend this analysis to the 19 further tests. 4.3.1 Air flow rate The redundancies in the calculation and the measurement of the air flow rate are compared together in order to determine the most accurate method : ● The air flow rate is measured with a nozzle at the exhaust of the third heat exchanger. The nozzle is calibrated and the air flow rate is calculated with the help of the ISO5167 standard. ● A second method to evaluate this air flow rate is the constructor data of the hot air generator : the air flow rate can be deduced from the settings of this hot air generator. ● The third method is the heat balance on the evaporator. This method presents the drawback of high uncertainties on the refrigerant flow rates (discussed in the next section) and the uncertainties on the measured temperatures. The airs flow rates measured at the nozzle is compared to the one calculated with the constructor data in figure 22 : The measurement uncertainties are indicated by the vertical lines. A more or less constant error of 10% appears between the two air flow rates, that cannot be explained Figure 22: Nozzle air flow rate vs Constructor air flow rate 47PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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