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Sylvain Quoilin Chapter 4 : Description of the experiments 4.1.2 Refrigerant flow rate The refrigerant flow rate is imposed by the pump. The fluid is in liquid state at the exhaust of the condenser and is incompressible. Therefore, its flow rate depends directly on the volumetric flow rate of the pump. Since the pump is a metering pump, this volumetric flow rate can be adjusted with an acceptable accuracy. The refrigerant flow rate is not directly measured. It is calculated from the heat balance over the condenser. It is thus necessary to measure the water flow rate and the temperatures with a good accuracy. In this work, the uncertainty on the water flow rate is set to 1% of the measured value. The uncertainty on the thermocouples is set to 0,3 K. The refrigerant flow rates given by the pump model and the heat balance on the condenser are compared in figure 24 : In this figure, I states for the test number, in chronological order. It is put on the x axis to give a description of the chronological evolution of the flow rate. It is obvious that the agreement between the two values is only acceptable at the beginning : The flow rate given by the pump (in blue) is close to the flow rate calculated at the condenser. But around test 16 – 17, the differences between the two flow rates cannot be explained by the uncertainties anymore. From test 21, this difference increases dramatically : the calculated flow rate even decreases while the pump flow rate increases. The pump in this case doesn't actuate as expected : it doesn't impose the Figure 24: Condenser calculated fluid flow rate and pump flow rate vs test number 51PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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