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Sylvain Quoilin Chapter 4 : Description of the experiments 4.3 Description of the tests. For this third series of tests, 39 points are realized in a one week period. The main improvement on this new test bench is the ability to change the refrigerant charge. This aspect will be exploited in order to understand how the cycle reacts to a refrigerant charge modification. All the tests are carefully defined before starting the test bench for the first time in order to avoid any improvisation during the test period. Their purpose is to evaluate the cycle response on a wide range of parameters and on parameters that were not taken into account in the previous tests. The test period is made as short as possible in order to minimize the refrigerant losses. The tests are performed as follows : 1st May 2007 : 3rd May 2007 : 4th May 2007 : 5th May 2007 : The purpose of this test is to evaluate the general behavior of the test bench on a few very classical parameters. The air flow rate is set to 3 different values. For each air flow rate value, the refrigerant flow rate is modified to 3 values. A first series of points is realized modifying the hot air source temperatures. These temperatures are set to 2 main values. For each value the refrigerant flow rate is modified. (points A to H) A second series is realized by modifying the refrigerant charge and the refrigerant flow rate. (points I to L) point N : attempt to maximize the output power point O and P : attempt to maximize the cycle efficiency by reducing the superheating at the evaporator exhaust and the subcooling at the condenser exhaust. The refrigerant charge is modified at a constant refrigerant flow rate from its minimum value (twophase state at the pump supply) up to its maximum value (two phase state at the expander supply). The expander rotation speed is set to 3 different values. For each rotational speed value, the fluid flow rate is set to 3 values, and for each flow rate, the refrigerant charge is set to the point of maximum efficiency (subcooling reduced at its minimum). 64PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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