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32 may indicate the presence of noncondensible gases in the Epper section of the condenser. Other early observations included the presence of o i l and water i n the plant working-fluid traps. Limited periodic venting of the condenser and draining of the traps were undertaken to reduce the potential for working-fluid impurities t o affect condenser performance. The amount of o i l found i n the traps decreased gradually with time, but the amount of water remained fairly consistent. The net variation of noncondensible concentration with time was difficult to judge because of the competing effects of venting and working-fluid addition a t irregular intervals. The latter operation led to the introduction of additional noncondensibles because the f i l l procedure required direct-contact pres- surization of the isobutane storage tanks with nitrogen gas. Late in the f i r s t period (October 9-10, 19801, an attempt was made t o remove any re- maining o i l , "washing" the outside of the condenser tube bundle by pumping liquid isobutane into the vent line at the top of the unit. Although somewhat difficult to discern because of the wide range of parameter variations, the general trend of condenser performance seemed to be one of gradual improvement from September to October 1980. The second period of surface evaporator node operations occurred in December 1980. For this sequence the plant was supplied with a complete new charge of isobutane before startup, and no further additions were made during the period. A preliminary l-h condenser vent procedure was under- taken t o minimize noncondensible concentrations i n the vapor space. Ex- amination of the plant traps showed some water but no oil. All performance data taken during this period are presented in Fig. 13. It is clear-from the plot that the data cluster closely around the prediction locus a distinct improvement over the f i r s t period re- sults. %pica1 second period data from the vapor space thermistors are given i n Fig. 14. These measurements vary l i t t l e from the corresponding pure isobutane saturation temperature a t any point. After an initial hookup and trial of the direct-contact evaporator in January1981,a third period of testing in the surface evaporator modewas conducted i n March 1981 t o map out plant operating ranges with the turbine running. Unfortunately, the outlet water thermistor gave erratic readingsPDF Image | Raft River Geothermal Test Site
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