The most expensive components of an OTEC system are the evaporators (heated by warm surface water), the condensers (cooled by water from 700-1000 m depth), and the floating ocean platform. To minimize these costs, a simple two-phase-flow heat exchangers made of large-diameter aluminum tubes (ammonia inside, sea water outside) are designed for integration in a simple, barge-type, reinforced concrete hull. Each 2.5-MW//e(net) evaporator or condenser module has 132 tubes approximately 700 ft long, folded to 27 horizontal passes each; 6 of these tubes are "nested" in a vertical plane in each of 22 "elements" . The method of analysis and a concept for assembling these modules are presented. The estimated costs for the heat exchangers and the total OTEC plant-ship (to busbars) are $5.45 sq. ft. of surface area and $1130/kW//e(net), respectively, for a first-of-a-kind, 100-MW//e(net) demonstration plant ship for use on tropical high seas. The costs for the sixth and subsequent 500-MW//e(net) commercial plant-ships are estimated to be 2.72/sq. ft. and 566/kW//e.

Media Info

  • Features: References;
  • Pagination: p. 485-506
  • Serial:
    • Volume: 5

Subject/Index Terms

Filing Info

  • Accession Number: 00168324
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jan 30 1978 12:00AM