A Comparison of Coolant Options for Brayton Power Conversion Heat Rejection Systems | Zendy

John Siamidis | Zendy; Lee S. Mason | Zendy

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A Comparison of Coolant Options for Brayton Power Conversion Heat Rejection Systems

Author(s) -

John Siamidis,

Lee S. Mason

Publication year - 2006

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.2169249

Subject(s) - brayton cycle , coolant , nuclear engineering , working fluid , materials science , water cooling , heat sink , mechanical engineering , environmental science , pressure drop , thermodynamics , heat exchanger , engineering , physics

This paper describes potential heat rejection design concepts for Brayton power conversion systems. Brayton conversion systems are currently under study by NASA for Nuclear Electric Propulsion (NEP) and surface power applications. The Brayton Heat Rejection Subsystem (HRS) must dissipate waste heat generated by the power conversion system due to inefficiencies in the thermal‐to‐electric conversion process. Sodium potassium (NaK) and H2O are two coolant working fluids that have been investigated in the design of a pumped loop and heat pipe space HRS. In general NaK systems are high temperature (300 to 1000 K) low pressure systems, and H2O systems are low temperature (300 to 600 K) high pressure systems. NaK is an alkali metal with health and safety hazards that require special handling procedures. On the other hand, H2O is a common fluid, with no health hazards and no special handling procedures. This paper compares NaK and H2O for the HRS pumped loop coolant working fluid. A detailed excel analytical mode...

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