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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>COMPACT CLOSED CYCLE GAS TURBINE FOR MARINE PROPULSION</title>
      <link>https://trid.trb.org/View/146034</link>
      <description><![CDATA[A compact closed cycle gas turbine was developed during research conducted on the feasibility of lightweight, compact closed Brayton cycle systems.  Emphasis was placed on applying the cycle to Navy high-speed ships.  These applications pose demanding requirements for compactness and light weight necessitating careful attention to the design of turbomachinery and heat exchanger components and their integration into the powerplant.  The use of helium, with its propensity to leak at ducting joints, requires that containment integrity be provided without precluding access to plant components for maintenance.  The design described meets these requirements by arranging the powerplant components in a closely integrated assembly within a completely enveloping pressure vessel.  The research accomplished to date is discussed and the predicted power conversion system performance and characteristics are summarized.]]></description>
      <pubDate>Wed, 07 Nov 1979 00:00:00 GMT</pubDate>
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      <title>BRAYTON CLOSED CYCLE GAS TURBINE STUDY FOR LNG RELIQUEFACTION SYSTEM</title>
      <link>https://trid.trb.org/View/19000</link>
      <description><![CDATA[The closed Brayton type cycle, which offers several advantages over a conventional gas turbine for marine and industrial use.  As the engine operates on a sealed circuit, clean dry gas is continuously recirculated through the unit at pressures of from 200 lb/sq in. to 500 lb/sq in.  This ensures a relatively corrosion-free operation and low maintenance costs for the rotating elements, while the specific fuel consumption, due to the turbines high efficiency, is comparable with that of a diesel engine. Initially the study, which will be carried out by the AiResearch Manufacturing Co. is for a 9000 shp turbine to be developed for a reliquefaction plant for an LNG tanker.]]></description>
      <pubDate>Tue, 07 May 1974 00:00:00 GMT</pubDate>
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      <title>9000-SHP CLOSED CYCLE POWER UNIT BEING DEVELOPED FOR LNG TANKERS</title>
      <link>https://trid.trb.org/View/13785</link>
      <description><![CDATA[The design of a 9000-shp closed cycle power unit for use as a refrigeration system aboard LNG tankers, with a secondary objective to define a technologically advanced closed cycle gas turbine main propulsion plant, is described.  The closed cycle engine, called the Brayton Cycle engine, is described in full, including an explanation of how the system operates, as well as advantages of the system.  This system would eliminate LNG boil-off by refrigerating the boil-off instead of reliquefying it, thereby utilizing advantages of safety, low weight, and size and design simplicity over a reliquefication unit.  The operation of the refrigeration unit, as well as descriptions of other features and advantages, are also included in the article.]]></description>
      <pubDate>Thu, 31 Jan 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/13785</guid>
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      <title>1970 ANNUAL TECHNICAL SYMPOSIUM (7TH). A CLOSED BRAYTON CYCLE POWER PLANT FOR UNDERWATER APPLICATIONS AND COMPARISON WITH FUEL CELL</title>
      <link>https://trid.trb.org/View/536</link>
      <description><![CDATA[A 50 KW thermochemical power plant for underwater applications featuring a typical application to a deep operating submersible is examined and comparisons made with a fuel cell power source.  Systems are studied for two depths (8,000 and 20,000 feet) and for three endurances ( 20, 40 and 120 hours ).  The analysis of a closed Brayton (20, 40 and 120 hours).  The analysis of a closed Brayton circulating gases in the loop such as Krypton, Argon, Xenon and Helium.  To make this analysis a computer program was developed in which values of enthalpy were obtained by multiplying the specific heat at constant pressure by temperature rather than using gas tables.  Calculations are shown for a single fuel cell including the reversible emf and the ideal comparative thermal efficiency.  Estimates are also given for the overall comparative efficiency of an actual fuel cell system.  Pressure vessels needed to encapsulate the power conversion module and the two reactants account for about one half of the total system weight at neutral buoyancy.  Calculations are shown for finding the specific fuel and oxidant consumption.  This is needed to size the pressure vessels as well as to add to the weight and volume inventory.  (Author)]]></description>
      <pubDate>Wed, 30 Dec 1970 00:00:00 GMT</pubDate>
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