Accession Number : AD0709387

Title :   1970 ANNUAL TECHNICAL SYMPOSIUM (7th). A CLOSED BRAYTON CYCLE POWER PLANT FOR UNDERWATER APPLICATIONS AND COMPARISON WITH A FUEL CELL,

Corporate Author : ASSOCIATION OF SENIOR ENGINEERS (NAVSHIPS) WASHINGTON D C

Personal Author(s) : Balukjian,Harry

Report Date : 1970

Pagination or Media Count : 93

Abstract : A 50 KW thermochemical power plant for underwater applications featuring a closed Brayton cycle power loop is described. 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 cycle includes a comparison using several different circulating gases in the loop such as Krypton, Argon and Xe - He. 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 approximately 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)

Descriptors :   (*UNDERWATER VEHICLES, *POWER SUPPLIES), (*FUEL CELLS, UNDERWATER VEHICLES), (*BRAYTON CYCLE, POWER SUPPLIES), THERMOCHEMISTRY, DEEP SUBMERGENCE, RELIABILITY(ELECTRONICS), ENCAPSULATION, GAS TURBINES, COMBUSTION, HYDROGEN, OXYGEN, LIQUEFIED GASES

Subject Categories : Electric Power Production and Distribution
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE