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Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen

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Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen ( modeling-low-temperature-rankine-cycle-small-scale-cogen )

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Sylvain Quoilin Chapter 4 : Description of the experiments 4.2.4.3 Checkout of the pump behavior by making it run in standalone mode In order to understand the too low flow rate detected in the first series of tests, the possibility of a pump malfunction is investigated. The expander is isolated from the circuit, the heat source and the heat sink are activated and the pump is run. The outlet pressure of the pump is adapted by modifying the opening of the valve at the Coriolis flow meter supply. The results of this test are given in figure 32. The pump seems to deliver the expected quantity of fluid for most of the tests, whatever its exhaust pressure. An important observation is made during those tests : for the point circled in red, the fluid is in two­ phase state at the inlet of the pump (presence of bubbles detected in the liquid indicator). It explains that the flow rate delivered by the pump is lower in this case. In order to make this two­phase state disappear, the air flow rate of the heat source has to be increased. The second green point is then obtained. This two­phase state most likely explains the low flow rate that was obtained during the second set of tests. Figure 32: Measured vs theoretical flow rate at the pump 62

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