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35 actual field conditions. Table 2 summarizes this comparison. The first column of the table gives as-built design parameters and,sample data taken during December 1980 experiments involving the vertical-fluted-tube con- denser. For comparison purposes, a conventional horizontal-smooth-tube condenser design was chosen with parameters i n the f i r s t three table groups fixed at actual values for the vertical-fluted-tube condenser test. With the "heat exchanger duty" specified in this manner, the required size of the horizontal-smooth-tube condenser was calculated using the methods of Ref. 8. The final table group reflects this calculation. A comparison of the two table columns indicates that, for the conditions given, the horizontal-smooth-tube design is nearly three times the size of the vertical-fluted-tube design. In other words, the vertical-fluted-tube concept offers the potential of a 65% reduction in condenser size for the stated conditions. Although other comparison bases may be chosen, this example demonstrates clearly the promise of vertical-fluted-tube con- densers under r e a l i s t i c power plant conditions. 6.3 Direct-Contact Evaporator Operatinn Mode A first try at operating the plant in the direct-contact evaporator mode was made in January1981. However, shakedown operation in this mode was not undertaken until April 1981. During this period, heat loads varied over a wide range, as emphasis was placed on determining column flooding points for the direct-contact evaporator. It was established that the plant would be limited to considerably less than design heat 108d if in- ates of isobutane carry-under were to be avoi d i n the evapo- hough the outlet wat thermistor continued t give erratic readings during this period, ot plant instrumentation ndicated that condenser performance was much poorer than the levels found in the surface evaporator mode tests. Subcooling of the upper vapor space was also gen- erally much greater. The second period of direct-contact operatio May-July 1981, in- cluded an examination of the effects of venting and brine preflash on c o r denser performance. Typical data (with the defective thermistor replaced) ,PDF Image | Raft River Geothermal Test Site
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