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Raft River Geothermal Test Site

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Raft River Geothermal Test Site ( raft-river-geothermal-test-site )

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28 6 . TEST RESULTS L Because of the difficulty in completely characterizing any given field test situation and the large volume of data takent an attempt has been made to distill, by example, the most consistent and important results into a relatively concise summary. Individual discussions are divided into two main groups according to the respective evaporator mode, surface or direct contact, because this distinction proved to be the most significant one encountered during the tests. Detailed data listings are relegated to Appendixes A and B. General operating ranges are summarized in Table 1. Table 1. Operating parameter ranges for vertical- fluted-tube condenser tests a t Raft River, September 1980Qctober Parame ter Shell pressure, Wa (psia) Isobutane saturation temperature, K (OF) Average water temperature, K (OF) Heat load, kW (Btu/h) Log mean temperature difference, K (OF) Water flow, m3/s (gpm) 1981 255172 (37-112) 288.2-3 28.7 (59-13 2 284.3-311.5 (52-101) 12-40 (0.4-2.2 x loc) 2.2-22.2 (4-40) 0.461-1.987 x low2 (73-315) 6.1 Surface Evavorator Overatinn Mode In the surface evaporator operating mode, the working fluid is physi- cally separated from the geothermal brine. Condenser design performance predictions were, of course, based on operation i n t h i s I1clean" mode (i.e., one without water noncondensible gas contamination from the brine). Fig- are 10 shows the condenser design point prediction, ATlm = 5.167 K (9.3O0F) a t a heat load of 586.1 LW (2.000 x lo6 Btu/h), with a water flow of 1.893 x 10-2 ma/s (300 gpm) and a water inlet temperature of 297.039 K (75.00OF). The locus of other predicted Q- ATlm combinations for these fixed water flow and water inlet temperature conditions is also shown. As Range

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