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Sylvain Quoilin Chapter 4 : Description of the experiments It is obvious that, during the period of the experiments, the level of liquid in the evaporator lowered. It is very likely that this lowering was caused by refrigerant losses. A very interesting experiment is the one corresponding to the points i = 20, 21 and 22. It was performed on the 8th of November with a faster expander rotating speed than for the other tests. Figure 27 shows the evolution of the supply and exhaust expander temperatures with time. The two vertical lines correspond to a modification of X pp successively from 60 to 70 and then 80%. After a change of Xpp , the temperatures should lower asymptotically to the new steady state temperatures. Figure 27 shows that the temperature lowers as expected but then rises without stabilizing. This is most likely due to the refrigerant losses, increased by the high velocity of the expander in this test. The hypothesis of refrigerant losses is corroborated by the emptying of the cycle before the third set of tests. Indeed, only 5.5 kg of refrigerant are recovered, although 10 kg were introduced in the cycle in September 2006. Figure 27: Evolution of expander temperatures for points n° 20, 21 and 22 54PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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