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toovers11turbineefficiencywasobtainedfromFigure5. The sample turbine is a nine-stage machine so the Z factor is 0.926. This produced a dry turbine efficiency of 0.877. Finally, the turbinemoisturepenaltywascalculated. Theportionofthe ex2ansioa in the wet region was equal to (137 Btu/lb)/(495 Btu/lb). This was obtained from a plot of the turbine expansion on a Mollier Chart, which is shown in Figure 15. A wet turbine efficiency of 0.869 w c i calculated as follows: 0.869 = 0.877 11 - (0.35) (1 - 0.904) (137/495)1 RCerring to Figure 13, the heat input to the preheater/ boi1err”uperheater was computed using the mass flow rate of of F i g u r e 14. The power output was a specified value, and the enyine’s heat rejection is the difference between the heat input an& the mrk output. Cycle efficiency is the work output divided bythe tnatinput. Cycle efficiency is shown plotted as a function of turbine inlettemperatureinFigures16through19. Thesefiguresshow dats fox four condensinq temperatures, three inlet pressures and three poweroutputs. ByreplottingthedataofFigures16through 19, cycle efficiency as a function of any of the four primary parameters can be obtained. An example of this is Figure 20, which shows cycle efficiency vs. condensing temperature. As was discussed in th~!section on turbine performance, all the cycle efficiency chartt.show an 85 percent turbine exit quality line, which is the design limit. EFFECT OF REHEAT The basic Rapl-ine cycle of Figure 13 was modified to include a reheater- The :eheat cycle is shown on a T-S diagram in Figure 21. Also shovin in Figure 21 is a regenerator, which will be discussed later A sanple reheat cycle calculation sheet is shown in Figure 22. Methods used to zompute cycle efficiency are similar to those des- cribedforthebasicengineintheprecedingsection. Extraction pressure from the turbine for reheating was defined with the following equation This method rill roughly balance the work output and moisture con- tentofth,twoportionsoftheexpansion. Afterreheating, readmiss,m totheturbinewasmadeataninletpressureof 0.97 P . T3is accounts for the pressure drop in the reheater heat t~changer. TurSine inlet temperature for the second expan- sion was defined .ab the original inlet temperature less SOOF. The above speciCications should permit low cost heat exchanger design. Staqs efficiency was computed for each of the expansions ba8;d ‘3.1 the Reynolds number at the exit of each expansion. The . 13PDF Image | Radial Outflow Turbine for Solar Steam Rankine Engines
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