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Sylvain Quoilin Chapter 4 : Description of the experiments 4.2 Third set of tests This third set of tests takes place in AprilMay 2007. The test bench is modified and improved according to the recommendations formulated after the analysis of the two first sets of tests. 4.2.2 ● General purpose of the new measurements : Validation of the models : The first models were validated on 13 points, but with an almost constant working fluid flow rate, and small variations of the other parameters. It is necessary to validate these model on a wider range of parameters. More accurate measurements will also improve the quality of those models. For example, in the modeling of the evaporator, a fictitious heat source had to be added before the aftercooler to compensate the measured difference between the heat fluxes on the air side and on the refrigerant side. Demonstration of the possibility to get more shaft power from the Rankine Cycle : In January 2006, Cristian Cuevas showed that it was possible to increase the cycle efficiency from 5 to almost 12 %. His recommendations to achieve this improvement are : Reduction of the condenser pressure drops and subcooling. Oversizing of the evaporator. Enhancement of the expander volume ratio, and reduction of the friction torque and of the leakage area Another very important parameter that needs to be controlled and optimized is the refrigerant flow rate. As explained above, it has been very difficult during the tests to have a good control of this parameter : the pump was not capable of imposing the flow rate and the latter decreased dramatically during the period of the experiments, decreasing in the same process the shaft power. On the test bench, only a limited number of “physical” parameters is accessible in order to achieve those improvements : The subcooling can be controlled by modifying the refrigerant charge. The flow rate can and should be controlled by the pump. ● 55PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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