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POWER CONVERSION SUBSYSTEM EFFICIEYCY The complete Power Conversion Subsystem (PCS) was analyzed to determine the amount of heat energy required to produce a given amount of electrisity. GEARBOX AND GENERATOR Data was obtained for commercial gearbox and generator effi- cienciesasafunctionofpoweroutput. Thisdataisshown plotted in Figure 30. As can be seen in Figure 30, gearbox/ generator efficiency decreases at an increasing rate below the 1000 KW power level. The power consumed by the gearbox lube pump was specified by the manufacturers to be approximately 0.05 percent of the output power. For the PCS efficiency calculations, the power consumption of this pump was assigned to a category of other PCS low power consumerswhichisdiscussedlater. Mostgearboxeshavedual pumps: in some cases, one shaft driven and one motor driven, to prevent the loss of oil pressure which csn be very damaging to this equipment. BOILER FEED PUMP Boiler feed pump power for the cycles of this study ranged between 0.2 to 1.5 percent of the turbine power output. The equation for feed pump pcwer was defined as follows: m (Pi-Pe) Ef = 806000 Thisequationisbasedupona70percentpumpefficiency. No electric motor efficiency was accounted for because this pump could potentially be shaft driven from either the turbine or gearbox. Forthesamplecycleusedinthisreporthavinginlet conditions of 1000°F, 1000 psia and llO°F (1.275 psia) condensing, the feed p m p power represents 0.8 percent of the power output. CONDENSER The steam condenser power consumption is dependent upon the type of unit selected, which is one of the following: 1. Direct contact, air-cooled 2. Cooling tower, evaporative-cooled 3. Shell and tube, water-cooled. In the above list, equipment cost and power consumption increase fromtoptobottom. Inthetablebelow,theapproximate.costof the three condenser types is shown as a function of the heat rejection load and the differential between condensing steam and ambient temperature 18PDF Image | Radial Outflow Turbine for Solar Steam Rankine Engines
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