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motor cooling is initiated at 20 minutes, pressurizing the motor cavity and arresting the loss of oil from the transmission cavity. At 40 minutes, overcooling of the motor cavity required that motor cooling be discontinued, whereupon the motor cavity pressure and the oil level dropped dramatically. The oil eductor system was started approximately 42 minutes into the plot when the hot gas temperature was sufficiently high, and both oil concentration and level responded favorably within 2-3 minutes. Motor cooling was adjusted several times between 50 and 60 minutes until the correct flow rate was achieved. Once motor cooling was restored, oil was reclaimed steadily over the next hour while good motor temperature was maintained. Oil viscosity also rises and stabilizes over this time, demonstrating good control of oil temperature and refrigerant concentration in the oil sump. Operation of the ORC with this revised oil management system, without the oil separator, showed that our current ORC startup sequence minimized the loss of oil from the turbo- generator sump. Also, the eductor system was able to restore the circulating oil concentration to an acceptable level over about an hour of operation. 2.3.2.4 Condenser modifications Condenser coil capacity was well predicted by models, but the condensing temperature was higher than anticipated. This higher condensing temperature reduced the pressure ratio across the turbine and consequently the work that could be extracted from it. Analysis of the data, summarized in Fig. 3.2.4.12, shows that a larger than expected pressure drop in the condenser inlet manifold, combined with collection of non- condensable gases in the system, accounted for the high condensing temperature. The manifold design was revised to reduce vapor velocities and to trap any liquid R245fa condensed on the vapor line walls. Also, commercial refrigerant purge units were evaluated for their applicability to R245fa and got incorporated in the system. Noncondensables 3.4 psi Turbine Exit Pressure Inlet Header 10.0 psi Tube DP From Coil_PC 2.7 psi Exit Header 0.7 psi Receiver Saturated Pressure 18.3 psia Remaining Measured DP 3.4 psi Capacity Comparison 200 150 100 50 0 164 176 157 R245fa Measured Measured Predicted Air Coil_PC Figure 2.3.11 Validation of condenser capacity and pressure drop 65 Capacity (Tons)PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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