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14 2.2.5 Installation After inspection and instrumentation port checks (Fig. 51, the con- denser was lifted into position beside the surface evaporator and fastened to the main test standofthe prototype power plant (Fig. 6). The unit was mounted slightly off vertical (-lo)with the top tilted slightly to the east to promote the flow of condensate from the baffles toward the bundle downcomers. Isobutane system connections were made to the vapor inlet, condensate return, pressure relief, and vent flanges. Cooling-water system connections were made to the inlet and outlet water head flanges. Instru- ments were attached a t appropriate ports. Electrical heaters were then strapped to the outside shell wall to provide freeze protection during cold weather operation. Next, a 3-in. layer of insulating cement was applied to the outside of the shell and covered with a layer of sheet metal. To com- plete the installation, the instrument leads were run t o the power plant control room. 2.2.6 Design Doint Design heat load, cooling-water flow, and cooling-water inlet tem- perature were chosen to be586.1kW(2.000Ilo6Btu/h),1.893xlo-’m3/s (300.0 gpm), and 297.039 K (75.0OoF), respectively. With the intended four-pass water-side arrangement, the assigned water flow was distributed among 27 working (heat transfer) tubes on the f i r s t and second passes [flowaveragevelocity=1.8194m/s(5.969ft/s)l and24workingtubes (25total -1 plugged) on the third and fourth passes [flow average ve- locity = 2.0468 m/s (6.715 ft/s)l. The working heat transfer (fluted) length of the bundle was4.061 m (13.32 ft), giving an effective shell- side heat transfer area of 52.604 mz (566.2 f t z ) and a corresponding tube- side heat transfer area of 28.821 m2 (310.2 ft2) with design heat fluxes of1.1135x104W/m2 (3532Bta/h*ftz)and2.0323xlo4W/m2 (6447Btu/ haft2), respectively. The chosen heat load, cooling-water flow, and cooling-water inlet temperature imp1ied a temperature rise of7.428 K (13.370F), an outlet temperature of 304.467 K (88.37oF1, and an average temperature of 300.753 K (81.690F) for the cooling water. From laboratory data2 with R-600a condensing on the outside of Tube E, it was estimated cPDF Image | Raft River Geothermal Test Site
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