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W is obtained at the same rotational speed. The difference in output is due to the increase in heat input. 1600 1400 1200 1000 800 600 400 1250 1500 1750 2000 2250 2500 2750 Nrot[rpm] 3000 3250 2 1 Figure 6.16 - Variation of the shaft power with the shaft rotation speed 6.5.1.7 System electrical efficiency The shaft power is evaluated through the measurements given by the torque meter and the shaft rotational speed while the electrical output is measured by the inverter. Knowing the shaft power and the electrical output of the asynchronous machine it is therefore possible to evaluate the electrical efficiency of the coupling. The nominal power of the asynchronous machine is 5.4 kW. The inverter displays the electrical output of the asynchronous machine as the percentage of the nominal power of the asynchronous machine. From the data displayed by the inverter, the electrical power produced by the asynchronous motor is computed and the electrical efficiency of the coupling system evaluated with the following relation: .. ηel=Wel/Wsh pinv.Wel,nom/Wsh (6.7) The electrical efficiency increases with the shaft power as it is seen on Figure 6.17. It varies between 70-79% for the first set of tests (low output power) and 79.6-90.5% for the second (high output power). Figure 6.18 shows the variation with the rotation speed. The electrical efficiency increases from low rpm passes through an optimum value and decreases afterwards. The points circled red on the graph are those for which the shaft power is maximum for each set. Concluding, the electrical efficiency and shaft power output are strongly linked. Page | 150 Wsh[W]PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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