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PCS AUXILIARY 1. TGG* instrumentation and controls 2. TGG* lube pumps 3. Gearbox oil cooler water pump 4. Condenser vacuum pump 5. Steam generator instrumentation and controls 6. Total *Turbine/gearbox/generator. POWER REQUIRED/ POWER OUTPUT 0.0005 0.0010 0 0.0025 0.0005 0.0050 As shown in the sample engine efficiency calculation which follows, a loss factor of 0.995 was applied to the cycle efficiency to account for the PCS auxiliary power consumption. POWER CONVERSION SYSTEM EFFICIENCY Shown in Figure 31 is a sample steam Rankine engine efficiency calculation sheet, which is based upon the steam Rankine cycle of Figure10. Lossfactorswerecomputedasdescribedaboveforthe following: 1. Gearbox 2. Generator 3. Stem generator feed pump 4. Condenser 5. Plant auxiliaries. For the sample calculation shown in Figure 31, the overall engine efficiency of the power conversion subsystem was calculated to be 0.309 for an air-cooled unit and 0.317 for a water-cooled unit. For a 1000 KW engine condensing at llO°F, which is compatible with air or water cooling, engine efficiency is shown as a function of turbine inlet conditions in Figures 32 and 33. PART LOAD OPERATION AND PERFORMANCE The ideal load curve, from an economic standpoint, for a solar electric powerplant would be to operate at or near full powerallofthetime. Intheearlysystems,itmaybepossible to connect them to the electrical grid in such a manner that would permitthistypeofoperation. Eventually,however,thesystem will have to be designed to respond to a load curve like that of thelargeelcctricutilities. Typically,thismeansanannual load factor of approximately 65 percent and the ability to turn- down to 20 percent load. The capability to operate efficiently at part load is therefore an important design criteria. Three methods of operating the steam Rankine engine at part load were investigated. These being the following: 20 0005PDF Image | Radial Outflow Turbine for Solar Steam Rankine Engines
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