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vapor-side of the saturation curve for the fill conditions in this test. (Note that higher fill densities could place this point on the liquid side of the saturation curve as well.) While spinning, at low shaft speeds, we observed density fluctuations. These appear to oscillate between the liquid to the vapor side of the saturation curve. The oscillations are seen in both the measured density at the compressor inlet, and in the predicted densities (based on T and P measurements). The oscillations are very slow and seem to correspond with the time it takes fluid to flow around the loop (~15 s). As the critical point is reached the magnitude of the density oscillations diminished, until the loop is operating above the dome when oscillations were no longer observed. 5.8.1.3 Compressor Mapping Test The compressor mapping tests were performed in two tests, CBC_090217_1139.csv and CBC_090217_1335.csv. The maps were made at speeds up to 50 krpm. Post test analysis shows that the compressor inlet was on the vapor side of the saturation curve. In spite of operating on the saturation curve, the data still show good agreement with the predicted compressor maps as described in the companion paper by Wright (Wright, 2009). 5.8.1.4 Near Steady-State Heating Test The last test was SpinTest62_CBC_090217_1426 which was a near steady-state operation of the heated un-recuperated loop at a heating power of ~78 kW. A brief description of this transient is provided here. During the first portion of this test the water cooling flow through the loop was adjusted to match the heater power while keeping the compressor inlet conditions just above the critical point. The power was estimated by using the requested fractional power requested for each heater and assuming 130 kW per heater. For this test, the water inlet temperature was 77°F. Prior to the high speed transient the shaft speed was at an idle speed of 10,000 rpm and the flow rate was 0.91 lb/s. At this very low flow and with the heaters operating, the turbine inlet temperature was 182°F, but the heater element temperature was 440°F (and increasing). The high speed transient was then started by increasing the shaft speed to 45,000 rpm which increased the flow rate to 3.2 lb/s. After a spike in temperature and mass flow rate, the system began to “approach” near steady-state conditions. During the “near steady-state” portion of the test, the compressor inlet temperature and pressure was 94.5°F and 1149 psia and changing only slowly. These temperatures were well above the critical point (87.7°F and 1069 psia ). The turbine inlet temperature at this time was 134.3°F and the CO2 thermal power increase was near 80 kW. This is a relatively low turbine inlet temperature but as will be shown in the next section, our analysis shows that the turbine was producing about ~7 kW or about as much power as the compressor was consuming. The measured test data results are shown in Figure 5-36 through Figure 5-40. 85PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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