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designs. Behavior of the turbine oil reclaim and motor cooling subsystems was also studied during these tests. Several detail changes were made to these subsystems to properly balance the pressure in the three internal generator and gearbox cavities and thus maintain the appropriate oil and coolant flows. Reliable operation of the bearing/lubrication system was demonstrated except at the highest load conditions. This behavior, which was believed to result from the use of compressor bearings in reverse rotation, was addressed through modification of the original tilt-pad bearing. Heat exchanger performance was verified. The vapor generator was to deliver 7 lb/s of R245fa with 20F superheat from a 700F, 5 lb/s inlet air stream with minimal allowable air-side pressure drop. The model accurately predicted the vapor generator capacity. The measured air-side temperature drop was predicted to within <1%. The R245fa side was also well predicted. Figure 2.3.5 shows a side view of the vapor generator, followed by the measured row-by-row temperature profile in the middle tube sheet and the model tube sheet average temperature prediction. (Note that the physical evaporator is counter-flow until row 24 and then co-flow to the exit at row 30. For clarity, the plotted temperature profiles are shown as if the entire unit was counter-flow.) The model followed the measured profile closely, and predicted a final superheat between the measured middle tube sheet value and the mixed superheat measured in the outlet header. Some vertical mal-distribution of outlet superheat was noted, apparently caused by gravity effects. Pressure drop on both air and R245fa sides was under predicted by 10-20%, but the as- tested values were acceptably low. 700°F Air 350 300 Row Temps Sat. Temp 250 ORCVAP FigAuvrge.3In.l2e.t4.2: Vapor generator horizontal temperature distribution 200 Avg. Exit 150 100 -30 -25 -20 -15 -10 -5 0 Row Figure 2.3.5 Gen I ORC evaporator performance 60 TemperaturePDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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