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u FIELD TESTS OF A VERTICAL-FLUTED-TUBE CONDENSER I N TEE F’ROTOTPPE POWER PLANT AT TEE RAFT RIVER GEO’IEERMACTESTSITE R. W. Murphy ABSTRACT A vertical-fluted-tube condenser was designed, fabri- cated, and tested with isobutane as the shell-side working fluid i n a binary prototype power plant a t the Raft River Geothermal Test Site. After shakedown and contamination removal operations were completed, the four-pass water-cooled unit (with 102 outside-fluted Admiralty tubes) achieved per- formance predictions while operating with the plant surface evaporator on-line. A sample comparison shows t h a t use of this enhanced condenser concept offers the potential for a reduction of about 65% from the size suggested by correspond- ing designs using conventional horizontal-smooth-tube con- cepts. Subsequent substitution of a direct-contact evaporator for the surface evaporator brought drastic reductions in sys- tem performance, the apparent consequence of high concentra- tions of noncondensible gases introduced by the brine/working- fluid interaction. 1. INTRODUCTION 0 &d That heat exchangers play a significant role in determining the eco- nomic feasibility of producing power from geothermal sources has been es- tablished by earlier studies.% For moderate temperature resources, opti- mizations using conventional component models suggest that (1)plants using a binary cycle are most likely to be cost-effective and (2)such plants require relatively large heat exchangers. The attractiveness of reducing the associated equipment investment led t o an examination of heat transfer enhancement techniques. Oak Ridge National Laboratory (ORNL) tests showed that the use of vertical-fluted tubes offered the potential for major improvements in condenser performance with working fluids appli- cable to the binary cycle.2*s However, it had not been demonstrated ex- perimentally that such performance could be achieved in sizes and field situations more characteristic of practical geothermal power plants.PDF Image | Raft River Geothermal Test Site
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